CN107935278A - A kind of processing method of foam gas production waste water and a kind of foam gas production wastewater treatment equipment - Google Patents
A kind of processing method of foam gas production waste water and a kind of foam gas production wastewater treatment equipment Download PDFInfo
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- CN107935278A CN107935278A CN201610889301.3A CN201610889301A CN107935278A CN 107935278 A CN107935278 A CN 107935278A CN 201610889301 A CN201610889301 A CN 201610889301A CN 107935278 A CN107935278 A CN 107935278A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
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Abstract
Processing method and a kind of foam gas production wastewater treatment equipment the invention discloses a kind of foam gas production waste water, it the treating method comprises and the pH value of foam gas production waste water is adjusted to more than 8.5, precipitation reaction is carried out, the mixture that precipitation reaction is obtained carries out separation of solid and liquid；Obtained liquid phase is subjected to air supporting；The pH value of air supporting water outlet is adjusted to be adsorbed with adsorbent after neutrality；Absorption water outlet is evaporated, obtains clear water.The characteristics of processing method of the present invention takes full advantage of foam gas production waste water itself, considerably reduce the species and dosage using medicament, realize and operated in neutral and alkaline environment, equipment investment cost and many hidden danger brought to equipment and operation are reduced, improve the security of operation.Also, the processing method of the present invention can obtain good treatment effect, be effectively reduced the COD value and salinity of foam gas production waste water, and can recycle the surfactant in waste water.
Description
Technical field
The present invention relates to field of industrial waste water treatment, in particular it relates to a kind of processing side of foam gas production waste water
Method and a kind of foam gas production wastewater treatment equipment.
Background technology
Technology of gas recovery by foam drainage is a kind of technology to be grown up using the foaming characteristic of surfactant, by well
Surfactant and high molecular polymer are introduced in the mineralized water of bottom, achievees the purpose that water pumping gas production using natural gas adsorption foam,
Suitable for the relatively low gas-water well of strata pressure, it is used widely at present in oil gas field gas production field.In foam gas production process
A large amount of waste water can be discharged with bubble, also referred to as steep draining, this kind of contaminated wastewater is serious, has oil-containing, high chemical oxygen consumption (COC)
(COD), the features such as high content of salt.Change due to the use of exhibiting high surface activating agent, drag reducer, scale remover, corrosion inhibiter etc. is preceding added
Medicament is learned, makes bubble draining biochemical difference and easily blistering, foam volume is big, it is difficult to focused on into sewage farm.Quick lift
The foam risen will also result in the conventional gas production wastewater treatment equipment based on mechanical steam recompression technology (MVR) evaporator and be difficult to
Operation.Also, bubble draining is different from routine and contains surface active agent wastewater, gas production foaming agent is often non-using two kinds and the above at the same time
The different types of surfactants such as ionic, both sexes or single ionic type, it is difficult to targetedly implement processing means.
CN104773893A discloses a kind of gas production waste water treatment process, which comprises the following steps：
A, advanced oxidation；
B, coagulation；
C, stripping；
D, it is evaporated under reduced pressure.
Wherein, the advanced oxidation in step A is to use Fenton oxidation method, added into waste water by hydrogen peroxide and
FeSO4The Fenton reagent of composition, active hydroxyl free radical is produced using Fenton reagent in acid condition, is accelerated organic
The oxidation of thing and reducing substances；Also, catalyst can be added in step, the catalyst is manganese dioxide, activated carbon
Or modification sulphonation titanium cyanines；In step A, pH value 3.5, FeSO in Fenton reagent4With H2O2Proportioning be 1：3, every liter of gas production is given up
The FeSO of 1g is put into water4With the H of 2mL2O2。
The specific method of step B is：PAC and PAM is added into waste water, suspended matter or glue in waste water are made by PAC and PAM
Absorption is combined into particle to body particulate mutually, so that its suspended matter or colloidal precipitation.In step B, the pH of coagulation process is weak base
Property, the dosage of PAC is 50-100ppm, and the dosage of PAM is 5-20ppm.
However, Fenton oxidation reaction needs to carry out in strong acidic environment, sour environment has strong corruption to equipment
Erosion acts on, and on the one hand improves the cost of investment and maintenance cost of equipment, on the other hand also there are security risk.In addition, the party
The whole process flow of method needs to use a variety of oxidants, catalyst, flocculant and flocculation aid, on the one hand adds answering for operation
Polygamy, on the other hand also improves operating cost.Importantly, in processing procedure, the surfactant in waste water is aoxidized
Resolution, can not recycling.
In summary, it is still desirable to the method that exploitation can be handled foam gas production waste water.
The content of the invention
It is an object of the invention to overcome existing foam gas production wastewater treatment method to need to be grasped in sour environment
Make, and the technical problem of surfactant therein can not be recycled, there is provided a kind of processing method of foam gas production waste water, the party
Method is operated under non-acidic environment, reduces the corrosivity to equipment, improves processing safety, and can realize surface
The recycling of activating agent.
Existing foam gas production wastewater treatment method, mainly using a large amount of in advanced oxidization method resolution foam gas production waste water
Existing surfactant, but most surfaces activating agent is removed by advanced oxidization method, on the one hand need in advanced oxygen
A large amount of oxidants and catalyst are added in chemical industry sequence, add running cost, it is on the other hand big due to being removed in front-end-of-line
Part surface activating agent, causes follow-up stripping process foamability deficiency, and the ability for removing residual surfactant is limited.It is heavier
Want, in processing procedure, the surfactant in waste water is cleared up by oxidation, can not recycling.
The present inventor is directed to the characteristics of foam gas production waste water and is studied, and finds first to adjust foam gas production waste water
PH value is more than 8.5, then carries out air supporting, can effectively remove the surfactant in waste water, and realize surfactant
Recycling, its reason may is that：The pH value of foam gas production waste water is adjusted to more than 8.5, can cause the ore deposit in waste water
Compound is separated out in the form of precipitating, and the sediment of precipitation can play the role of flocculated, effectively remove the condensate in waste water,
The removal of condensate and alkaline operating condition are conducive to waste water blistering, so as to improve pneumatically supported efficiency, are effectively reduced
The content of surfactant in waste water, and recycle surfactant.Based on above-mentioned discovery, the present invention is completed.
According to the first aspect of the invention, the present invention provides a kind of processing method of foam gas production waste water, this method
Comprise the following steps：
Settling step, at least one alkaline matter is added into foam gas production waste water, and the additive amount of the alkaline matter makes
The pH value for obtaining the foam gas production waste water is more than 8.5, and to carry out precipitation reaction, the mixture that precipitation reaction is obtained is consolidated
Liquid separates, and obtains liquid phase；
Air supporting step, the liquid phase that settling step is obtained carry out air supporting, recycle froth bed, while obtain air supporting water outlet；
Adsorption step, is adjusted to neutrality, air supporting water outlet after adjusted pH value, by the adjusting by the pH value of air supporting water outlet
Air supporting water outlet is adsorbed with adsorbent after pH value；
Evaporation step, absorption water outlet is evaporated, obtains clear water.
According to the second aspect of the invention, the present invention provides a kind of foam gas production wastewater treatment equipment, the device bag
Include precipitation unit, air flotation cell, absorbing unit and evaporation element；
The precipitation unit includes precipitation reaction subelement and separation of solid and liquid subelement, and the precipitation reaction subelement is used
In foam gas production waste water is contacted with least one alkaline matter, to carry out precipitation reaction, the separation of solid and liquid subelement is treated
The reaction mixture outlet of separation of material entrance and the precipitation reaction subelement, for by the precipitation reaction subelement
The reaction mixture of output carries out separation of solid and liquid, obtains liquid phase；
The air flotation cell is used to the liquid phase of separation of solid and liquid subelement output carrying out air supporting, recycles froth bed, together
When obtain air supporting water outlet；
The absorbing unit is used to contact the water outlet of the air flotation cell with adsorbent, carries out adsorbing separation；
The evaporation element is used to the water outlet of absorbing unit being evaporated, to obtain clear water.
The characteristics of foam gas production wastewater treatment method according to the present invention takes full advantage of foam gas production waste water itself, greatly
Ground reduces the species and dosage of processing procedure Chinese medicine, and realizes and operated in neutral and alkaline environment, is dropping
While low equipment investment cost, many hidden danger brought to equipment and operation are also reduced, reduce the construction cost of device
And operating cost, improve the security of operation.Importantly, treatment in accordance with the present invention method can obtain good processing
Effect, is effectively reduced the COD value and salinity of foam gas production waste water, obtains the clear water of colorless and odorless；Processing whole process is adopted substantially
With physical separation means, the surfactant in waste water is also able to effective recycling.
Brief description of the drawings
Attached drawing is for providing a further understanding of the present invention, and a part for constitution instruction, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.
Fig. 1 is used to illustrate foam gas production wastewater treatment equipment according to the present invention.
Embodiment
The embodiment of the present invention is described in detail below.It is it should be appreciated that described herein specific
Embodiment is merely to illustrate and explain the present invention, and is not intended to limit the invention.
The endpoint of disclosed scope and any value are not limited to the accurate scope or value herein, these scopes or
Value should be understood to comprising the value close to these scopes or value.For number range, between the endpoint value of each scope, respectively
It can be combined with each other between the endpoint value of a scope and single point value, and individually between point value and obtain one or more
New number range, these number ranges should be considered as specific open herein.
According to the first aspect of the invention, the present invention provides a kind of processing method of foam gas production waste water, this method
Comprise the following steps：
Settling step, at least one alkaline matter is added into foam gas production waste water, and the additive amount of the alkaline matter makes
The pH value for obtaining the foam gas production waste water is more than 8.5, and to carry out precipitation reaction, the mixture that precipitation reaction is obtained is consolidated
Liquid separates, and obtains liquid phase；
Air supporting step, the liquid phase that settling step is obtained carry out air supporting, recycle froth bed, while obtain air supporting water outlet；
Adsorption step, is adjusted to neutrality, air supporting water outlet after adjusted pH value, by the adjusting by the pH value of air supporting water outlet
Air supporting water outlet is adsorbed with adsorbent after pH value；
Evaporation step, absorption water outlet is evaporated, obtains clear water.
The foam gas production waste water refers to the waste water discharged in foam gas production process with bubble, also referred to as steeps draining.It is described
The mineralizer content of foam gas production waste water is higher, its salinity is usually more than 10000mg/L, is specifically as follows 12000-
250000mg/L, such as 15000-30000mg/L.In the present invention, the salinity refers to the total content of the salt in water, the salt example
Such as：Carbonate, heavy carbonate, chloride, sulfate, the nitrate of the metals such as calcium, magnesium, iron, aluminium and manganese；And various sodium salts.
In foam gas production waste water, the content of calcium salt and magnesium salts is higher.In the present invention, salinity is according to China-styled Certain Industry Field standard SL79-
Gravimetric detemination specified in 1994.
The foam gas production waste water contains exhibiting high surface activating agent, causes the COD (COD of foam gas production waste water
Value) it is high.Usually, the COD value of the foam gas production waste water is more than 1000mg/L, is specifically as follows 1500-30000mg/L,
Such as 2000-20000mg/L.In the present invention, COD value is measured using potassium dichromate method.
The foam gas production waste water also contains condensate.Usually, the oil content in the foam gas production waste water is
More than 100mg/L, is specifically as follows 150-900mg/L, such as 200-800mg/L.In the present invention, condensate in foam gas production waste water
Content use infrared spectrophotometric determination.
The foam gas production waste water also has higher suspension content.Usually, the suspended matter of foam gas production waste water contains
Measure as more than 50mg/L, be specifically as follows 60-2000mg/L, such as 70-1500mg/L.In the present invention, hanged in foam gas production waste water
The content of float uses gravimetric detemination.
The pH value of the foam gas production waste water is generally in the range of 6-7.5, such as in the range of 6.2-7.
The method according to the invention, in settling step, the alkaline matter is used to adjust the pH value of foam gas production waste water
For more than 8.5 (such as 8.5-14), so that the mineralizer in foam gas production waste water is separated out in the form of sediment, on the one hand reduce
The salinity of foam gas production waste water, another aspect sediment can also play the role of it is flocculated, even if not adding flocculant additionally,
The content of condensate in foam gas production waste water can be effectively reduced.
The alkaline matter can be the material of the common various pH value that can improve foam gas production waste water.Preferably, institute
It is alkali metal hydroxide to state alkaline matter.It is highly preferred that the alkaline matter is sodium hydroxide and/or potassium hydroxide.
Preferably, the additive amount of the alkaline matter make it that the pH value of foam gas production waste water is more than 9, such as 9-14.From into
One step improves the angle of the Precipitation rate of mineralizer and raising waste water foamability in foam gas production waste water and sets out, the alkalescence
The additive amount of material is preferably so that the pH value of foam gas production waste water is more than 9.5, such as 9.5-14.It is highly preferred that the basic species
The additive amount of matter preferably so that the pH value of foam gas production waste water is more than 10, such as 10,10.5,11,11.5,12,12.5,13,
13.5、14.It is further preferred that the additive amount of the alkaline matter is preferably so that the pH value of foam gas production waste water is 10-14, such as
10-13。
In the settling step, the mixture that conventional method obtains precipitation reaction can be used to carry out separation of solid and liquid, from
And the sediment of precipitation reaction formation is isolated, obtain liquid phase.The present invention is not particularly limited for the method for separation of solid and liquid, can
With using conventional method, such as filtering, centrifugation, sedimentation or the combination of two or more separation methods.When being filtered, can adopt
With common various filter mediums, such as group more than one or both of fabric, porous material, solid particle layer and filter paper
Close.Preferably, mixture precipitation reaction obtained is settled, and is preferably standing sedimentation, so as to isolate precipitation reaction shape
Into sediment, obtain liquid phase.
The method according to the invention, in air supporting step, the liquid phase that settling step is obtained carries out air supporting, utilizes the bubble of formation
Most surfaces activating agent is separated from the water and recycled by foam, while reduces the COD value of water outlet.The method according to the invention,
In settling step, most of condensate in foam gas production waste water is removed, and the liquid phase that settling step obtains is alkalescence, this two
A factor each contributes to the surfactant blistering in the liquid phase that settling step obtains, so as to be conducive to be separated from the water recycling table
Face activating agent.
The method according to the invention, in air supporting step, it is preferred to use air-dissolving air-float, hydrogen peroxide decompose one kind in gas processed
Or two or more combinations, it can so be accumulated on liquid level and form more stable dry foam layer, further reduce taking for foam
Liquid measure and the COD value of air supporting water outlet, improve the quality of air supporting water yield and air supporting water outlet, and improve returning for surfactant
Yield, the liquid carry over of obtained foam are usually to be not higher than 160mL/L, are preferably not higher than 100mL/L foams, more preferably not
Higher than 50mL/L foams, more preferably not higher than 10mL/L foams.In the present invention, foamability and foam carrier amount use
Air-flow method measures.
The air-dissolving air-float can carry out under normal conditions, and usually, dissolved-air pressure can be 0.2-0.8MPa, so
The liquid carry over of foam and the COD value of air supporting water outlet can be further reduced, improves the quality of air supporting water yield and air supporting water outlet,
Foam carrier amount is generally not higher than 160mL/L foams.It is preferred from the angle for further improving daf efficiency, dissolved-air pressure
For 0.3-0.6MPa.It is highly preferred that dissolved-air pressure is 0.4-0.5MPa, the liquid carry over of thus obtained foam is generally not higher than
10mL/L foams.In air-dissolving air-float, at least part dissolved air water is preferably air supporting water outlet, so can further reduce present invention side
The operating cost of method.That is, the pressurized molten gas Posterior circle of at least part air supporting water outlet is used for air-dissolving air-float, usually, can be by 10-
The pressurized molten gas Posterior circle of air supporting water outlet of 50 weight %, preferably 15-40 weight %, more preferably 20-30 weight % is used for molten gas
Air supporting.
The hydrogen peroxide decomposes gas processed and refers to hydrogen peroxide being added in liquid phase, decomposes hydrogen peroxide and produces oxygen
Gas, so that liquid phase produces foam.The dosage of hydrogen peroxide can make choice according to the property of the liquid phase of processing.It is preferred that
Ground, the dosage of hydrogen peroxide is 0.01-1.5mol/L.It is highly preferred that the dosage of hydrogen peroxide is 0.15-1.1mol/L.
It is further preferred that the dosage of hydrogen peroxide is 0.5-1mol/L, the liquid carry over of thus obtained foam is generally not higher than
10mL/L foams.Can be by the liquid phase that hydrogen peroxide and settling step obtain in the bar for being enough to make hydrogen peroxide decompose generation oxygen
Reacted under part.Usually, reaction temperature can be 40-90 DEG C, be preferably 45-80 DEG C, more preferably 50-70 DEG C.
In air supporting step, the pneumatically supported duration is subject to the height of froth bed and no longer raises.In the present invention, foam is judged
The no longer elevated Standard General of height of layer is that the lift-off value of the height of froth bed is not more than 5mm in 3 minutes.
Air supporting step can be removed foam using conventional method, obtain air supporting water outlet.The foam of removing is substantially with surface
Based on activating agent, it can be recycled for preparing foam gas production water.
The method according to the invention, air supporting water outlet are further adsorbed, and to carry out advanced treating, further reduce air supporting
The content (that is, the COD value for further reducing air supporting water outlet) of surfactant in water outlet.
The method according to the invention, in adsorption step, before being adsorbed, first the pH value by air supporting water outlet is adjusted to
Neutrality, air supporting water outlet after obtained adjusting pH value is contacted with adsorbent, is adsorbed.Usually, by the pH value of air supporting water outlet
It is adjusted to 6-8.Conventional method can be used to adjust the pH value of air supporting water outlet, such as acidic materials are added into air supporting water outlet, such as
Hydrochloric acid and/or sulfuric acid, so that the pH value of air supporting water outlet is adjusted to neutrality.
The adsorbent can be common adsorbent.Preferably, the adsorbent can be activated carbon, molecular sieve,
Combination more than one or both of resin type adsorbent and clay-type sorbents.The instantiation of the resin type adsorbent
It can include but is not limited to：Nonpolar adsorption resin (such as styrene type absorption resin), middle polarity absorption resin (such as polypropylene
Acid esters type adsorbs resin) and one or both of polar adsorbent (such as acid/acrylic amide type absorption resin) more than.The clay
The instantiation of type adsorbent can include but is not limited to one kind or two in kaolin, montmorillonite, diatomite and attapulgite
More than kind.The molecular sieve can be Y type molecular sieve, X-type molecular sieve, A type molecular sieve, L-type molecular sieve, Beta types molecular sieve,
FER types molecular sieve, MOR types molecular sieve, ZSM types molecular sieve, MCM types molecular sieve, SAPO molecular sieve, MCM types molecular sieve and SBA types
It is more than one or both of molecular sieve.The instantiation of the molecular sieve can include but is not limited to Y type molecular sieve, X-type point
Son sieve (such as 13X molecular sieves), A type molecular sieve (such as 3A molecular sieves, 4A molecular sieves, 5A molecular sieves), L-type molecular sieve, Beta types point
Sub- sieve, FER types molecular sieve, MOR types molecular sieve, type ZSM 5 molecular sieve, ZSM-22 types molecular sieve, ZSM-11 types molecular sieve, ZSM-
23 type molecular sieves, ZSM-35 types molecular sieve, MCM-22 types molecular sieve, MCM-49 types molecular sieve, MCM-36 types molecular sieve, MCM-56
Type molecular sieve, SAPO-34 types molecular sieve, SAPO-11 types molecular sieve, SAPO-5 types molecular sieve, SAPO-18 types molecular sieve, APO-5
Type molecular sieve, APO-11 types molecular sieve, MeAPO-11 types molecular sieve, MCM-41 types molecular sieve, MCM-48 types molecular sieve, MCM-50
Type molecular sieve, SBA-15 types molecular sieve, SBA-16 types molecular sieve, MSU-1 types molecular sieve and one kind in MSU-2 type molecular sieves or
It is two or more.Preferably, the molecular sieve is 3A molecular sieves, 4A molecular sieves, 5A molecular sieves, 13X molecular sieves, 10X molecular sieves and Y
It is more than one or both of type molecular sieve.
The dosage of the adsorbent can be conventional selection.Preferably, the dosage of the adsorbent is 0.1-100g/L.
It is highly preferred that the dosage of the adsorbent is 0.5-50g/L.It is further preferred that the dosage of the adsorbent is 0.8-
10g/L.It is further preferred that the dosage of the adsorbent is 1-5g/L.
In adsorption step, the duration that air supporting water outlet is contacted with adsorbent after adjusting pH value can be conventional selection.One
As, the duration that air supporting water outlet is contacted with adsorbent after adjusting pH value can be 10-120 minutes, be preferably 20-80 points
Clock, more preferably 30-60 minutes.
In adsorption step, after the completion of adsorption operations, supernatant liquor is removed, obtains absorption water outlet.
The method according to the invention, absorption water outlet is further evaporated in evaporation step, so as to obtain clear water.
Method according to the invention it is possible to using conventional method of evaporating, such as MVR evaporation techniques, multiple-effect evaporation technology
One or both of more than combination.
The evaporation can carry out under normal conditions.Usually, the evaporation can be at 70-95 DEG C, preferably 75-90 DEG C
At a temperature of carry out, the vacuum in container being evaporated can be 80-90kPa.
The method according to the invention, the clear water evaporated can be circulated for preparing foam drainage gas recovery.Evaporation obtains
Solid matter can be used as Nacl.
According to the second aspect of the invention, the present invention provides a kind of foam gas production wastewater treatment equipment, such as Fig. 1 institutes
Show, which includes precipitation unit, air flotation cell, absorbing unit and evaporation element.
Precipitation unit includes precipitation reaction subelement and separation of solid and liquid subelement.Precipitation reaction subelement is used for foam
Gas production waste water is contacted with least one alkaline matter, to carry out precipitation reaction.Precipitation reaction subelement can use conventional sink
Shallow lake reactor, foam gas production waste water is contacted with alkaline matter, carries out precipitation reaction.
The material inlet to be separated of separation of solid and liquid subelement and the reaction mixture outlet of precipitation reaction subelement, are used
Separation of solid and liquid is carried out in the reaction mixture for exporting precipitation reaction subelement, obtains liquid phase.
Separation of solid and liquid subelement can use conventional method, such as filtering, centrifugation, sedimentation or two or more separation methods
Combination.Using filter method when, common various filter mediums can be used, as fabric, porous material, solid particle layer and
Combination more than one or both of filter paper.Preferably, precipitation reaction is obtained using the method for sedimentation, preferably standing sedimentation
Mixture separated so that isolate precipitation reaction formation sediment, obtain liquid phase.
The liquid phase output of precipitation unit is connected with the water inlet end of air flotation cell, for the liquid phase of precipitation unit to be sent into gas
Air supporting is carried out in floating unit.
Air flotation cell is used to the liquid phase of separation of solid and liquid subelement output carrying out air supporting, recycles froth bed, at the same time
To air supporting water outlet.Air flotation cell preferably decomposes the combination of one or both of gas processed above using air-dissolving air-float, hydrogen peroxide,
Further to reduce the COD value of the liquid carry over of froth bed and air supporting water outlet, air supporting water yield is further improved.
The foam of air flotation cell output can be circulated for preparing foam gas production water based on surfactant.Thus,
Air flotation cell can also have foam cycle subelement, for by the foam cycle that air flotation cell exports to foam gas production water conservancy project
Sequence.
The air supporting water outlet of air flotation cell is connected with the liquid phase arrival end of absorbing unit, the air supporting that air flotation cell is exported
Water outlet is sent into absorbing unit and carries out deep processing., can also be by part air supporting water outlet when air flotation cell uses air-dissolving air-float
Circulation is used for air flotation cell as the dissolved air water in air-dissolving air-float.Thus, air flotation cell can also include air supporting water outlet circulation
Unit, for the water outlet circulation of at least part air flotation cell to be sent into air flotation cell as dissolved air water, carries out pressure air-dissolving.
Air flotation cell can also include temperature control subelement (not shown in figure 1), for being controlled to pneumatically supported temperature
System.For example, when decomposing gas processed using hydrogen peroxide, the liquid phase of hydrogen peroxide can will have been added by temperature control subelement
Temperature control be 40-90 DEG C, be preferably controlled to 45-80 DEG C, more preferably control be 50-70 DEG C.
Absorbing unit is used to contact the water outlet of air flotation cell with adsorbent, carries out adsorbing separation.Absorbing unit can wrap
Include it is conventional it is various can accommodate air supporting water outlet, and the container for making air supporting water outlet be contacted with adsorbent.The liquid phase of absorbing unit
Output terminal is connected with the material inlet end to be evaporated of evaporation element, and the water outlet of absorbing unit is sent into evaporation element.
Evaporation element is used to the water outlet of absorbing unit being evaporated, to obtain clear water.
Evaporation element can use conventional evaporator, such as the evaporator based on MVR, the evaporator based on multiple-effect evaporation
One or both of more than combination.
Evaporation element can include clear water output channel (not shown in figure 1), for clear water to be exported.Usually, clear water
Clear water can be sent into foam drainage gas recovery process and recycle by output channel.
When being handled using the device shown in Fig. 1 foam gas production waste water, it can be carried out according to following technique.By foam
Gas production waste water is sent into the precipitation reaction subelement of precipitation unit, adds alkaline matter into foam gas production waste water, foam is adopted
The pH value of gas waste water is adjusted to alkalescence, is preferably adjusted to more than 8.5 (such as 8.5-14), is more preferably adjusted to more than 9 (such as 9-14),
More than 9.5 (such as 9.5-14) further preferably are adjusted to, more than 10 (such as 10-14) is still more preferably adjusted to, is precipitated
Reaction.The liquid-solid mixture that precipitation reaction obtains is sent into separation of solid and liquid subelement and carries out separation of solid and liquid, obtains liquid phase.
The liquid phase that separation of solid and liquid subelement is exported is sent into air flotation cell, carries out air supporting.It is preferred that using air-dissolving air-float, mistake
Combination more than one or both of hydrogen peroxide decomposition gas carries out air supporting.The foam that air flotation cell obtains passes through foam cycle
Subelement is sent into foam gas production process and is recycled.When air flotation cell includes air-dissolving air-float, part air supporting water outlet is passed through
Air supporting water outlet circulation subelement circulation, which is sent into air flotation cell, is used as dissolved air water.The remaining air supporting water outlet that air flotation cell obtains is sent into
Advanced treating is carried out in absorbing unit.
In absorbing unit, air supporting water outlet is contacted with adsorbent, is adsorbed.The adsorbent can be activated carbon,
Combinations more than one or both of molecular sieve, resin type adsorbent and clay-type sorbents.The clear liquid that absorbing unit obtains,
It is sent into evaporation element and is evaporated.The specific species of the adsorbent has been carried out being described in detail above, herein not
It is described in detail again.
In evaporation element, the water outlet of absorbing unit is evaporated, obtains clear water.The clear water that evaporation element obtains can be with
Circulation is sent into foam drainage gas recovery process and is recycled.The solid phase that evaporation element obtains can be used as Nacl to export.
The present invention will be described in detail with reference to embodiments, but the scope being not intended to limit the present invention.
In following embodiments and comparative example, salinity gravimetric method according to specified in China-styled Certain Industry Field standard SL79-1994 is surveyed
It is fixed.
In following embodiments and comparative example, COD value is measured using potassium dichromate method.
In following embodiments and comparative example, the content of condensate is surveyed using infrared spectrophotometer in foam gas production waste water
It is fixed.
In following embodiments and comparative example, the content of suspended matter uses gravimetric detemination in foam gas production waste water.
In following embodiments and comparative example, foamability and foam carrier amount are measured using air-flow method.Specific method is：Will
It is 1.2m, in the foamed pipe of a diameter of 36mm that 400mL water to be measured, which is injected with graduated length, and a glass is installed in the lower end of tubing string
Sand plate, is passed through air into tubing string, every liter of air-flow of test passes through the continuous of rear generation with the flow of 0.01NL/s by glass sand plate
Thysanophyllum volume (that is, is passed through the volume after air-flow and is passed through the difference of the volume before air-flow), using the volume as weighing the energy that blisters
The index of power, the index value is bigger, illustrates that foamability is better；Pneumatically supported water inlet and water outlet are measured respectively and are absorbed
The foamability of water, calculates foamability change rate, so that indirect measure air supporting operation and adsorption operations using the following formula
Surfactant removing ability, wherein, foamability change rate is on the occasion of showing that foamability declines, surfactant takes off
Except rate is high,
Foamability change rate=[(the Thysanophyllum volume that the Thysanophyllum volume-water outlet that water inlet produces produces)/into aquatic products
Raw Thysanophyllum volume] × 100%；
The foam that test produces is collected, the alkaline-resisting defoamer of polyethers is added and (is purchased from the limited public affairs of federal fine chemistry industry in Guangdong
Department, model B-307, addition is 0.25g/L foams) after, the volume of the water in every liter of foam of measure, as foam carrier
Amount.
In following embodiments and comparative example, the no longer elevated Standard General of height of froth bed is judged in 3 minutes, bubble
The lift-off value of the height of foam layer is not more than 5mm.
Embodiment 1-10 is used to illustrate the present invention.
Embodiment 1
Foam gas production waste water is handled using the device shown in Fig. 1, concrete technology is as follows.
(1) foam gas production waste water (its nature parameters is listed in table 1) is sent into precipitation unit, to foam gas production waste water
In add sodium hydroxide, the pH value of foam gas production waste water is adjusted to 10, produces a large amount of yellow-whites precipitation rapidly.By precipitation reaction
Obtained liquid-solid mixture is filtered with filter paper (being purchased from Hangzhou Wo Hua filter paper Co., Ltd, similarly hereinafter), is obtained clarification liquid phase, is hanged
(three is respectively using suspended matter, condensate and COD value in foam gas production waste water as base for the removal rate of float, condensate and COD
Standard, similarly hereinafter) listed in table 2.
(2) liquid phase by precipitation unit output is sent into air flotation cell, carries out air supporting.Air flotation cell uses air-dissolving air-float,
Dissolved-air pressure is 0.4MPa, and the duration of air-dissolving air-float no longer raised for 20 minutes to froth bed.Top layer foam is removed to obtain
Surfactant (liquid carry over is 8.6mL/L foams) is recycled, air supporting water outlet is obtained, by air supporting water outlet with the reflux ratio of 20 weight %
Dissolved air water is recycled as, the removal rate of COD (on the basis of the COD value of liquid phase for being sent into air flotation cell, similarly hereinafter) arranges in table 2
Go out.
(3) remainder air supporting water outlet is sent into absorbing unit, sulfuric acid is added into air supporting water outlet, by air supporting water outlet
PH value be adjusted to 6.5, then according to the concentration of 4g/L add kaolin (purchased from District, Xinyang Area, Henan Province letter and mining industry Co., Ltd), stir
Mix after forty minutes, carry out stratification, supernatant liquor as absorption water outlet, COD removal rate (using the COD value of air supporting water outlet as
Benchmark, similarly hereinafter) listed in table 2.
(4) adsorb water outlet and be evaporated crystallization in 75 DEG C, the evaporator that vacuum is 80kPa, obtain colorless and odorless
Clear water, its yield (on the basis of the total amount of foam gas production waste water, similarly hereinafter) and COD value are listed in table 2.
Comparative example 1
Foam gas production waste water is handled using method same as Example 1, unlike, without step (1),
But directly foam gas production waste water is sent into step (2) and carries out air supporting, the liquid carry over of obtained froth bed is steeped for 415mL/L
Foam.
Experimental result is listed in table 2.
Comparative example 2
(1) foam gas production waste water is handled using Fenton methods：The pH value of foam gas production waste water is adjusted to 3.5,
Then the Fenton reagent being made of hydrogen peroxide and ferrous sulfate is added into foam gas production waste water, wherein, hydrogen peroxide with
The molar ratio of ferrous sulfate is 1：3, every liter of waste water adds 1g ferrous sulfate, when reaction 1 is small at room temperature.Carry out after reaction
Filtering, obtains liquid phase.
(2) liquid phase for obtaining step (1) carries out air supporting using the method identical with 1 step of embodiment (2).
(3) the air supporting water outlet for obtaining step (2) is adsorbed using the method identical with 1 step of embodiment (3).
(4) water that absorbs for obtaining step (3) is evaporated using the method identical with 1 step of embodiment (4).
Experimental result is listed in table 2.
Embodiment 2
Foam gas production waste water is handled using method same as Example 1, unlike, in step (2), use
Following methods carry out air supporting：
By micropore gas distributor (micropore size be 80-100 μm) to the gas for accommodating the liquid phase that precipitation unit exports
Air is injected in floating trough, air water volume ratio is 10：1, foam persistently supplies 5 minutes to froth bed by being overflowed at the top of air flotation slot
Height no longer raises.Removal top layer retains foam and is recycled surfactant (liquid carry over is 860mL/L foams), obtains air supporting
Water outlet.
Experimental result is listed in table 2.
Embodiment 3
Foam gas production waste water is handled using method same as Example 1, unlike, in step (2), molten gas
Pressure is 0.2MPa, and the layer that defoams is recycled surfactant (liquid carry over is 148mL/L foams).
Experimental result is listed in table 2.
Table 1
Table 2
1：The removal rate of suspended matter, condensate and COD is respectively with suspended matter, condensate and COD in foam gas production waste water
On the basis of value, similarly hereinafter；
2：On the basis of the COD value of liquid phase of the removal rate of COD to be sent into air flotation cell, similarly hereinafter；Foamability change rate with
On the basis of the foamability of air supporting water inlet, similarly hereinafter；
3：The removal rate of COD is on the basis of the COD value of air supporting water outlet, similarly hereinafter；Foamability change rate is with air supporting water outlet
On the basis of foamability, similarly hereinafter；
4：Yield is on the basis of the total amount of foam gas production waste water, similarly hereinafter.
Embodiment 4
Foam gas production waste water is handled using the device shown in Fig. 1, concrete technology is as follows.
(1) foam gas production waste water (with embodiment 1) is sent into precipitation unit, hydroxide is added into foam gas production waste water
Potassium, 12 are adjusted to by the pH value of foam gas production waste water, produce a large amount of yellow-white precipitations rapidly.The liquid that precipitation reaction is obtained mixes admittedly
Compound isolates liquid phase after 25 DEG C stand 30 minutes, obtains clarification liquid phase, the removal rate of suspended matter, condensate and COD is in table
Listed in 3.
(2) liquid phase by precipitation unit output is sent into air flotation cell, carries out air supporting.Air flotation cell is using hydrogen peroxide point
Solution gas, hydrogen peroxide is added in liquid phase according to the concentration of 1mol/L, liquidus temperature then is increased to 70 DEG C, in the temperature
The lower stirring reaction of degree 30 minutes, until the no longer rise of froth bed.Remove top layer foam and be recycled surfactant (liquid carry over
For 5.8mL/L foams), air supporting water outlet is obtained, the removal rate of COD is listed in table 3.
(3) remainder air supporting water outlet is sent into absorbing unit, hydrochloric acid is added into air supporting water outlet, by air supporting water outlet
PH value be adjusted to 7, then according to the concentration of 5g/L add montmorillonite (purchased from District, Xinyang Area, Henan Province letter and mining industry Co., Ltd), stirring
After 50 minutes, stratification is carried out, supernatant liquor is listed as absorption water outlet, the removal rate of COD in table 3.
(4) adsorb water outlet and be evaporated crystallization in 75 DEG C, the evaporator that vacuum is 90kPa, obtain colorless and odorless
Clear water, its yield and COD value are listed in table 3.
Embodiment 5
Foam gas production waste water is handled using method same as Example 4, unlike, in step (3), cover de-
Soil with etc. the activated carbon (being purchased from Tianjin Fu Chen chemical plant) of weight replace.
Experimental result is listed in table 3.
Embodiment 6
Foam gas production waste water is handled using method same as Example 4, unlike, in step (3), cover de-
Soil with etc. weight 5A types molecular sieve (purchased from Shanghai have recruit sieve Co., Ltd) replace.
Experimental result is listed in table 3.
Embodiment 7
Foam gas production waste water is handled using method same as Example 4, unlike, in step (3), cover de-
Soil with etc. the D101 nonpolar macroporous adsorption resins (being purchased from Zhengzhou Qin Shi Science and Technology Ltd.s) of weight replace.
Experimental result is listed in table 3.
Embodiment 8
Foam gas production waste water is handled using the device shown in Fig. 1, concrete technology is as follows.
(1) foam gas production waste water (with embodiment 1) is sent into precipitation unit, hydroxide is added into foam gas production waste water
Sodium, 13 are adjusted to by the pH value of foam gas production waste water, produce a large amount of yellow-white precipitations rapidly.The liquid that precipitation reaction is obtained mixes admittedly
Compound is filtered with filter paper, obtains clarification liquid phase, and the removal rate of suspended matter, condensate and COD is listed in table 3.
(2) liquid phase by precipitation unit output is sent into air flotation cell, carries out air supporting.Air flotation cell is using hydrogen peroxide point
Solution gas, hydrogen peroxide is added in liquid phase according to the concentration of 0.8mol/L, liquidus temperature then is increased to 50 DEG C, at this
At a temperature of stirring reaction 80 minutes, until froth bed no longer rise.Removal top layer foam is recycled surfactant and (takes liquid
Measure as 6.2mL/L foams), air supporting water outlet is obtained, the removal rate of COD is listed in table 3.
(3) remainder air supporting water outlet is sent into absorbing unit, sulfuric acid is added into air supporting water outlet, by air supporting water outlet
PH value be adjusted to 6.5, then according to the concentration of 1g/L add montmorillonite (purchased from District, Xinyang Area, Henan Province letter and mining industry Co., Ltd), stir
Mix after forty minutes, carry out stratification, supernatant liquor is listed as absorption water outlet, the removal rate of COD in table 3.
(4) adsorb water outlet and be evaporated crystallization in 75 DEG C, the evaporator that vacuum is 90kPa, obtain colorless and odorless
Clear water, its yield and COD value are listed in table 3.
Table 3
Embodiment 9
Foam gas production waste water is handled using the device shown in Fig. 1, concrete technology is as follows.
(1) foam gas production waste water (its nature parameters is listed in table 4) is sent into precipitation unit, to foam gas production waste water
In add sodium hydroxide, the pH value of foam gas production waste water is adjusted to 10, produces a large amount of yellow-whites precipitation rapidly.By precipitation reaction
Obtained liquid-solid mixture is filtered with filter paper, obtains clarification liquid phase, the removal rate of suspended matter, condensate and COD is in table 5
List.
(2) liquid phase by precipitation unit output is sent into air flotation cell, carries out air supporting.Air flotation cell uses air-dissolving air-float,
Dissolved-air pressure is 0.5MPa, and the duration of air-dissolving air-float no longer raised for 10 minutes to froth bed.Top layer foam is removed to obtain
Surfactant (liquid carry over is 8.5mL/L foams) is recycled, air supporting water outlet is obtained, by air supporting water outlet with the reflux ratio of 30 weight %
Dissolved air water is recycled as, the removal rate of COD is listed in table 5 (on the basis of the COD value of liquid phase for being sent into air flotation cell).
(3) remainder air supporting water outlet is sent into absorbing unit, sulfuric acid is added into air supporting water outlet, by air supporting water outlet
PH value be adjusted to 8, then add kaolin (being purchased from Lingshou County Tian Hao mineral products processings factory) according to the concentration of 3g/L, stirring 30
After minute, stratification is carried out, supernatant liquor is listed in table 5 as absorption water outlet, the removal rate of COD.
(4) adsorb water outlet and be evaporated crystallization in 85 DEG C, the evaporator that vacuum is 90kPa, obtain colorless and odorless
Clear water, its yield and COD value are listed in table 5.
Comparative example 3
Foam gas production waste water is handled using method same as Example 9, unlike, in step (1), it will steep
The pH value of foam gas production waste water is adjusted to 8, and the liquid carry over for the froth bed that step (2) obtains is 351mL/L foams.
Experimental result is listed in table 5.
Embodiment 10
Foam gas production waste water is handled using method same as Example 9, unlike, in step (2), use
Following methods carry out air supporting：
By micropore gas distributor (micropore size be 80-100 μm) to the gas for accommodating the liquid phase that precipitation unit exports
Air is injected in floating trough, air water volume ratio is 4：1, persistently supply 10 minutes and no longer raised to froth bed.Remove top layer and retain bubble
Foam is recycled surfactant (liquid carry over is 260mL/L foams), obtains air supporting water outlet.
Experimental result is listed in table 5.
Table 4
Table 5
Embodiment 1-10's as a result, it was confirmed that the method according to the invention can be effectively reduced the COD value of foam gas production waste water
And salinity, the suspended matter and condensate in foam gas production waste water are removed, while the table in foam gas production waste water can also be recycled
Face activating agent.
The preferred embodiment of the present invention described in detail above, still, during present invention is not limited to the embodiments described above
Detail, in the range of the technology design of the present invention, a variety of simple variants can be carried out to technical scheme, this
A little simple variants belong to protection scope of the present invention.Each particular technique described in above-mentioned embodiment is special
Sign, in the case of reconcilable, can be combined, in order to avoid unnecessary repetition, this hair by any suitable means
It is bright that various combinations of possible ways are no longer separately illustrated.In addition, can also between a variety of embodiments of the present invention
It is combined, as long as it without prejudice to the thought of the present invention, it should equally be considered as content disclosed in this invention.
Claims (17)
1. a kind of processing method of foam gas production waste water, this method comprise the following steps：
Settling step, at least one alkaline matter is added into foam gas production waste water, and the additive amount of the alkaline matter causes institute
The pH value for stating foam gas production waste water is more than 8.5, and to carry out precipitation reaction, the mixture that precipitation reaction is obtained carries out solid-liquid point
From obtaining liquid phase；
Air supporting step, the liquid phase that settling step is obtained carry out air supporting, recycle froth bed, while obtain air supporting water outlet；
Adsorption step, is adjusted to neutrality, air supporting water outlet after adjusted pH value, by the adjusting pH value by the pH value of air supporting water outlet
Air supporting water outlet afterwards is adsorbed with adsorbent；
Evaporation step, absorption water outlet is evaporated, obtains clear water.
2. according to the method described in claim 1, wherein, in settling step, the additive amount of the alkaline matter causes the bubble
The pH value of foam gas production waste water is more than 9, is preferably more than 9.5, more preferably 10-14.
3. method according to claim 1 or 2, wherein, in settling step, the alkaline matter is selected from alkali metal hydrogen-oxygen
Combination more than one or both of compound；
Preferably, the alkaline matter is NaOH and/or KOH.
4. according to the method described in any one in claim 1-3, wherein, in air supporting step, the air supporting uses molten gas gas
Floating, hydrogen peroxide decomposes combination more than one or both of gas processed.
5. according to the method described in claim 4, wherein, in the air-dissolving air-float, dissolved-air pressure 0.2-0.8MPa, is preferably
0.3-0.6MPa, more preferably 0.4-0.5MPa.
6. method according to claim 4 or 5, wherein, in the air-dissolving air-float, at least part dissolved air water comes from air supporting
Water outlet.
7. according to the method described in claim 4, wherein, the hydrogen peroxide is decomposed in gas processed, reaction temperature is 40-90 DEG C,
Preferably 45-80 DEG C, more preferably 50-70 DEG C.
8. the method according to claim 4 or 7, wherein, the hydrogen peroxide is decomposed in gas processed, the throwing of the hydrogen peroxide
Dosage is 0.01-1.5mol/L, is preferably 0.15-1.1mol/L, more preferably 0.5-1mol/L.
9. according to the method described in any one in claim 4-8, wherein, in air supporting step, the pneumatically supported condition causes
The liquid carry over of the foam of formation is not higher than 10mL/L foams.
10. according to the method described in any one in claim 1-9, wherein, in adsorption step, by the pH value of air supporting water outlet
It is adjusted to 6-8.
11. according to the method described in any one in claim 1-10, wherein, in adsorption step, adsorbent is selected from activity
Combinations more than one or both of charcoal, molecular sieve, resin type adsorbent and clay-type sorbents.
12. according to the method described in any one in claim 1-11, wherein, in evaporation step, evaporate 70-95 DEG C, it is excellent
Carried out at a temperature of selecting 75-90 DEG C, the vacuum in container being evaporated is 80-90kPa.
13. according to the method described in any one in claim 1-12, wherein, in the foam gas production waste water, COD value is
1500-30000mg/L, oil content 150-900mg/L, the salinity of the foam gas production waste water is 12000-25000mg/L,
The suspension content of the foam gas production waste water is 60-2000mg/L.
14. a kind of foam gas production wastewater treatment equipment, which includes precipitation unit, air flotation cell, absorbing unit and evaporation
Unit；
The precipitation unit includes precipitation reaction subelement and separation of solid and liquid subelement, and the precipitation reaction subelement is used for will
Foam gas production waste water is contacted with least one alkaline matter, to carry out precipitation reaction, the separation of solid and liquid subelement it is to be separated
The reaction mixture outlet of material inlet and the precipitation reaction subelement, for the precipitation reaction subelement to be exported
Reaction mixture carry out separation of solid and liquid, obtain liquid phase；
The air flotation cell is used to the liquid phase of separation of solid and liquid subelement output carrying out air supporting, recycles froth bed, at the same time
To air supporting water outlet；
The absorbing unit is used to contact the water outlet of the air flotation cell with adsorbent, carries out adsorbing separation；
The evaporation element is used to the water outlet of absorbing unit being evaporated, to obtain clear water.
15. device according to claim 14, wherein, the air flotation cell decomposes system using air-dissolving air-float, hydrogen peroxide
Combination more than one or both of gas.
16. device according to claim 15, wherein, the air flotation cell further includes circulation subelement, for by air supporting
At least part water outlet circulation of unit, which is sent into air flotation cell, is used as dissolved air water.
17. according to the device described in any one in claim 14-16, wherein, the air flotation cell further includes foam cycle
Subelement, for by the foam cycle that air flotation cell exports to foam gas production water conservancy project sequence.
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