CN100482604C - Method and apparatus for treating emulsified oil waste water - Google Patents
Method and apparatus for treating emulsified oil waste water Download PDFInfo
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- CN100482604C CN100482604C CNB2007101057204A CN200710105720A CN100482604C CN 100482604 C CN100482604 C CN 100482604C CN B2007101057204 A CNB2007101057204 A CN B2007101057204A CN 200710105720 A CN200710105720 A CN 200710105720A CN 100482604 C CN100482604 C CN 100482604C
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Abstract
本发明公开了一种乳化油废水处理方法，包括隔油、破乳、投加易降解物质、共降解膜生物法除油和污泥处理5个步骤，本发明在含油废水的生物处理法上，将共降解机理与膜生物反应器的应用有机的结合起来，强化了生物处理油污染物的能力，突破了油对微生物的抑制作用。本发明还公开了一种乳化油废水处理设备，包括依次连接在一起的分质调节池、破乳池、中间池、膜生物反应池，产生的污泥依次进入储泥池、脱水机，所述的破乳池外设置破乳剂投加装置，所述的中间池外设置营养盐投加装置。设备对生物反应器进水油浓度、COD浓度要求宽泛，对污染物降解能力强、处理出水可达标，产泥量小、对环境造成的二次污染小，设备工艺流程简单，节省投资及运行费用。
The invention discloses a method for treating emulsified oily wastewater, comprising five steps of oil separation, demulsification, adding easily degradable substances, co-degradation membrane biological method for oil removal and sludge treatment. The invention is based on the biological treatment method of oily wastewater , combining the co-degradation mechanism with the application of membrane bioreactor organically, strengthening the ability of biological treatment of oil pollutants, and breaking through the inhibitory effect of oil on microorganisms. The invention also discloses an emulsified oil wastewater treatment equipment, which includes a quality separation adjustment tank, a demulsification tank, an intermediate tank, and a membrane bioreaction tank connected in sequence, and the generated sludge enters a sludge storage tank and a dehydrator in sequence. A demulsifier dosing device is set outside the demulsification tank, and a nutrient salt dosing device is set outside the intermediate tank. The equipment has broad requirements on the oil concentration and COD concentration of the bioreactor influent, strong degradability of pollutants, up to the standard of treated water, small amount of mud production, small secondary pollution to the environment, simple equipment process, saving investment and operation cost.
Description
Technical field
The invention belongs to field of waste water treatment, relate to the oily(waste)water especially bioremediation and the treatment facility of high-concentration emulsified oil wastewater.
Background technology
Emulsifiable oil waste water is comparatively unmanageable a kind of in the oily(waste)water, and its main component is machine oil or mineralized oil, emulsifying agent, lubricated sanitas and water.Oil in water emulsion in this waste water is highly stable, survivable, intractable, this is to make oil become stable emulsion because contain tensio-active agent in its waste water, oil droplet size is atomic little, its surface forms one deck limitans, have electric charge, the peripheral electrostatic double layer that forms of oil droplet makes the mutual repeller of oil droplet inaccessibility, certain stability is arranged on kinetics, therefore more difficult.In addition, organic content is very high in the emulsion, and COD is being generally several ten thousand milligrams every liter.The normal at present oily wastewater treatment method that uses mainly is divided into chemical method, physics method, physico-chemical process, biological process etc.The normally combined and staged use of several method makes effluent quality reach emission standard in the practical application.Common emulsifiable oil waste water treatment process has, and saltouts-acidifying-settling process, oil removal-little flocculence, saltouts-air supporting-absorption method etc.Mainly there is following several problem in prior art:
(1) chemical method, physics method only can realize the oil removing effect, degree of treatment is not high enough, still contain higher organic pollutant in its treat effluent, COD concentration does not reach emission standard, if will realize qualified discharge, certainly will want several different methods, plural serial stage, cause problems such as long flow path, complex treatment process.
(2) processing of high-concentration emulsified oil wastewater often after breakdown of emulsion, air supporting, need to continue to adopt tertiary treatment technology intensifying treatment effects such as charcoal absorption, ultrafiltration, but the working cost of these physical chemistry methods is higher.Also there are some problems in the biological treatment of oily(waste)water at present, the biological process of widespread usage is based on traditional activated sludge process and biomembrance process principle at present, low, the microorganism active of sludge concentration is subject to oil and suppresses in the reaction tank, to the pre-treatment water outlet is the water quality requirement strictness of bio-reactor water inlet, load low, processing efficiency is low, must cause for obtaining preferable effluent quality that Chi Rongda, floor space are big, problems such as capital construction or working cost height.
(3) membrane filtering method is more rising a kind of deoiling method during present emulsifiable oil waste water is handled, and it is to utilize the little characteristics in ultra-filtration membrane aperture ratio oil droplet aperture, logical filtering mode, the purpose of realization oil in water emulsion water sepn.Filter membrane often is made into hollow fiber pipe strainer, and with the filtration area of increase film, but strainer stops up film cleaning difficulty, process cost height, capital construction, running cost height easily.And the concentrated solution after filtering still need be handled, and generally adopts burning method, and expense is too high, and environment is caused secondary pollution.
Summary of the invention
For solving the problem that prior art exists, the invention provides a kind of novel emulsion oil biological wastewater treatment technology, it can be broken through owing to higher concentration oil is handled the inefficient bottleneck of oily(waste)water to the biological process that the inhibition of microorganism causes, this technology is wide in range to intake oil concentration, COD concentration requirement of bio-reactor, strong to the contaminant degradation ability, processing efficiency is high, treat effluent can be up to standard, the secondary pollution that sludge output is little, cause environment is little.This technical matters flow process is simple, reduces investment outlay and working cost.
Technical process of the present invention comprises following five steps:
1), in minute matter equalizing tank regulating pondage, exclude the upper strata oil slick;
2), the waste water that will exclude behind the oil slick of upper strata pumps into the breakdown of emulsion pond, adds the chemical agent breakdown of emulsion;
3), the waste water behind breakdown of emulsion pond gravity flow entered in the middle of the pond, in the middle of described, drop into easily biodegradable organics in the pond, and required nitrogen N, the phosphorus P nutritive salt of additional microorganism growth, after the short stay, pump into the membrane biological reaction pond again;
4), the waste water behind the breakdown of emulsion is able to further oil removing, degraded COD in the membrane biological reaction pond, the water after the processing is directly effluxed by the film suction pump through membrane sepn.
5), chemical sludge, membrane biological reaction pond residual active sludge behind the breakdown of emulsion carry out processed by sludge treating system, pressing filtering liquid returns branch matter equalizing tank, the mud cake outward transport.
As a kind of improvement of the present invention, the described easily biodegradable organics of step 3) is a glucose, and in the 1kg waste water COD: the ratio of 0.5～1.0kg glucose adds, and described nitrogen N, phosphorus P nutritive salt are bicarbonate of ammonia and primary ammonium phosphate.
Being implemented as follows of each step of the present invention:
Establish the oil separating plate oil removal in step 1), the branch matter equalizing tank, oil slick can be by manually regularly removing or be provided with the automatic skim of floater oil skimmer.The submersible sewage pump that is used to promote emulsifiable oil waste water in the pond is arranged on 0.5～1.0m place at the bottom of the pond, in order to promote comparatively purified emulsifiable oil waste water.This pond simple structure, utilize factors such as pond body structure, difference of altitude to remove oil slick, sediment in the design dexterously to subsequent disposal---the influence of breakdown of emulsion reaction, can bring into play the function of emulsion splitter to greatest extent, to reduce the consumption of emulsion splitter.Divide the interior hydraulic detention time of matter equalizing tank according to the desirable HRT=1～10d of wastewater flow rate size.
Step 2), the emulsifiable oil waste water after step 1) is handled reacts with emulsion splitter in the breakdown of emulsion pond, the limitans of emulsification oil droplet is destroyed, forms big oil dripping pearl, emerges.The breakdown of emulsion pond be configured to circular stainless steel or carbon steel jar, stirrer is established at the top.What be connected with tank body has four to five kinds of pipelines that are positioned at different heights, is followed successively by from high to low: upflow tube, scum silica frost pipe, water shoot, sediment pipe, blow-down pipe.Wherein water shoot can set up 2～3 separately again on different heights, if branch matter equalizing tank lift pump has return line, upflow tube can not established.The present invention adopts chemical demulsification method, but emulsion splitter is not specifically explicitly called for, can select institute according to the cost of the concrete property of different emulsifiable oil waste waters, emulsion splitter, the factors such as whether facility obtained, therefore employed emulsion splitter might not be that of demulsification the best is a kind of.But its prerequisite is oily(waste)water COD＜3000mg/L, the oil＜600mg/L that will guarantee to enter behind the breakdown of emulsion membrane biological reaction pond.Rule of thumb, calcareous emulsion splitter is adopted in suggestion as far as possible less.Breakdown of emulsion pond operation scheme is: intermittently, operation in batches, be 1.5～4.0h batch working time, by manually or control automatically.
Step 3), middle pond are steel construction or concrete structure, hydraulic detention time HRT=0.5～1d, in establish lift pump.Water outlet behind the breaking milk and removing oil is the pond in the middle of flowing to, and pumps into the membrane biological reaction pond via middle pond.The breakdown of emulsion pond is that intermittent mode operation, membrane biological reaction pond are the continuous mode operation, therefore in the middle of the effect in pond be the breakdown of emulsion pond and being connected and conversion of membrane biological reaction pond, guarantee the continuity of biological respinse with this.According to the co-degradation theory, in middle pond, add glucose or other easily biodegradable organicses, in the 1kg waste water COD: the ratio of 0.5～1.0kg glucose adds.And suitably additional required N, the P nutritive salt of microorganism growth.In addition as required, also can in middle pond, regulate the selected emulsion splitter of pH value (depending on step 2) of waste water), to guarantee microbial growth requirement in the step 4).
Waste water in step 4), the middle pond is promoted to the membrane biological reaction pond by pump.The membrane biological reaction pond is steel construction or concrete structure, and inside is separated but communicated, and is divided into membrane cisterna and oxidation pond.Membrane module is one group in the built-in board-like liquid of membrane cisterna, and one group is multi-disc, counts difference according to the different sheets of the water yield, and membrane flux is 0.30～0.5m
3/ sheet .d.Lay many group high-efficiency aerators in the oxidation pond, be the microorganism oxygen supply.Because film has good mud-water separation characteristic, sludge concentration is 10～20g/L in the membrane biological reaction pond, far above ordinary activated sludge oxidation pond (3～4g/L).In the membrane biological reaction pond, a large amount of microorganisms is the metabolism that earns a bare living of first nutraceutical matrix with easily biodegradable organicses such as glucose, simultaneously the oil in the waste water is removed as co-degradation matrix is collaborative.Again because the distinctive cross-flow filtration cleaning function of film in the board-like liquid, with and isolating be active sludge flco and water, rather than oil molecule and water molecules have alleviated the film possibility of jamming greatly, make that the diaphragm-operated life-span was 7～10 years in the board-like liquid.
Scum silica frost behind step 5), the breakdown of emulsion, sediment and membrane biological reaction pond excess sludge all enter the mud storage pool, deliver to plate-and-frame filter press by the mud spiral pump again or the belt sludge dewatering equipment dewaters, and pressing filtering liquid is back to branch matter equalizing tank and handles again, the mud cake outward transport.Chemical sludge and active sludge mixed dehydration help strengthening sludge dewatering effect, mud good stability, have reduced second environmental pollution.
The present invention also provides a kind of emulsifiable oil waste water treatment facility, described equipment comprises branch matter equalizing tank, breakdown of emulsion pond, middle pond, the membrane biological reaction pond that is connected in turn, the mud that produces enters storage basin, water extracter successively, the emulsion splitter throwing device is set outside described breakdown of emulsion pond, outside the pond nutritive salt throwing device is set in the middle of described.
As a kind of improvement of the present invention, established oil separating plate or grease trap at described minute in the matter equalizing tank, oil slick can be by manually regularly removing or be provided with the automatic skim of floater oil skimmer.The submersible sewage pump that is used to promote emulsifiable oil waste water in the pond is arranged on 0.5～1.0m place at the bottom of the pond, in order to promote comparatively purified emulsifiable oil waste water.
As a kind of improvement of the present invention, described breakdown of emulsion pond be configured to circular stainless steel or carbon steel jar, stirrer is established at the top.What be connected with tank body has four to five kinds of pipelines that are positioned at different heights, is followed successively by from high to low: upflow tube, scum silica frost pipe, water shoot, sediment pipe, blow-down pipe.Wherein draining can be set up 2～3 separately again on different heights.If branch matter equalizing tank lift pump has return line, upflow tube can not established.Breakdown of emulsion pond operation scheme is: intermittently, operation in batches, and by manually or control automatically.
As a kind of improvement of the present invention, the pond body in described membrane biological reaction pond is steel construction or concrete structure, and inside is separated but communicated, and is divided into membrane cisterna and oxidation pond.Membrane module in the liquid is set in the membrane cisterna; Lay high-efficiency aerator in the oxidation pond.
Technological principle of the present invention is as follows:
Oils is a kind of hydro carbons organism, can utilize microorganism that its decomposing oxidation is become carbonic acid gas and water on the principle.But oils it is generally acknowledged the restraining effect that has of microorganism, flow into the oil concentration of biological treatment structures combined sewage, usually can not be greater than 30～50mg/L, otherwise will influence active sludge and biomembranous eubolism process.Thereby the bioremediation of emulsifiable oil waste water load is low, efficient is low, and all conventional biological processes are usually used in handling dissolving oil, and should not be used to handle oil in water emulsion.Discover, with glucose, beef peptone or yeast extract microorganism as nutraceutical matrix, can the co-degradation catenanes.Thereby adopt glucose etc. easily oxidation matrix as the first matrix culturing micro-organisms, and with second matrix of oil in water emulsion as microorganism, utilize the co-degradation principle, will improve biological treatment load and efficient greatly, thereby change the traditional understanding that biological process should not be handled emulsifiable oil waste water.
Technical characterstic of the present invention is oil removal-breakdown of emulsion-co-degradation membrane biological process.Breakthrough point of the present invention is on the biological treatment of oily(waste)water, introduced the co-degradation theory, and the application of co-degradation mechanism and membrane bioreactor organically combined, strengthened the ability of biological treatment oil contaminants, broken through the restraining effect of oil to microorganism.The intake restriction of oil concentration of bio-reactor is promoted to 600mg/L by the 30～50mg/L that thinks for a long time, and the upper limit of water inlet COD concentration can reach 2000～3000mg/L.This method has broken through the traditional biological method and has handled low, the weak effect of emulsifiable oil waste water load, and, microorganism strict to pre-treatment is subject to limitations such as oil inhibition, can satisfy comparatively strict emission request.This method adopts co-degradation technology, culturing micro-organisms, and (COD=1700～3000mg/L, oil＜600mg/L), the treatment system water outlet can realize COD＜100mg/L, oil＜10mg/L to handle oily(waste)water behind the breakdown of emulsion.
The present invention can be used for the processing of oily(waste)water, is particularly suited for handling the oily(waste)water of the little water yield, high density, high emulsibility.
Breaking milk and removing oil method of the present invention is simple to operation, only adopts the chemical demulsification method breakdown of emulsion, leaves standstill for some time behind the breakdown of emulsion, and profit need not again through dissolved air flotation by the gravity natural separation.
Equipment bio-reactor of the present invention water inlet oil concentration, COD concentration requirement are wide in range, strong to the contaminant degradation ability, processing efficiency is high, treat effluent can be up to standard, the secondary pollution that sludge output is little, environment is caused is little, and this apparatus and process flow process is simple, reduces investment outlay and working cost.
Description of drawings
Fig. 1: emulsifiable oil waste water treatment process process flow sheet of the present invention
Fig. 2: membrane biological reaction of the present invention pond treatment effect figure
Fig. 3: the organigram of co-degradation of the present invention-membrane biological process emulsifiable oil waste water treatment facility
Fig. 4: divide matter oil trap structure sketch
Fig. 5: divide matter oil trap structure sketch
Fig. 6: breakdown of emulsion pond structure sketch
Embodiment:
Describe the structure of emulsifiable oil waste water treatment process provided by the invention and emulsifiable oil waste water treatment facility in detail below in conjunction with accompanying drawing.
The structure of co-degradation of the present invention-membrane biological process emulsifiable oil waste water treatment facility as shown in Figure 1, comprise the branch matter equalizing tank 1, breakdown of emulsion pond 2, middle pond 3, the membrane biological reaction pond 4 that are connected in turn, the mud that produces enters storage basin 5, water extracter 6 successively, is provided with outside the described breakdown of emulsion pond outside emulsion splitter throwing device 7, the described middle pond nutritive salt throwing device 8 is set.
The structure of dividing matter equalizing tank 1 as shown in Figures 2 and 3, waste liquid enters branch matter equalizing tank 1 through a minute matter equalizing tank water inlet pipe 16, establishes 10 oil removals of oil removal device in the branch matter equalizing tank 1, oil slick can be by manually regularly removing or be provided with floater oil skimmer 15 automatic skims.The waste liquid lift pump 9 that is used to promote emulsifiable oil waste water in the pond is arranged on 0.5～1.0m place at the bottom of the pond, in order to promote comparatively purified emulsifiable oil waste water.This pond simple structure, utilize factors such as pond body structure, difference of altitude to remove oil slick, sediment in the design dexterously to subsequent disposal---the influence of breakdown of emulsion reaction, can bring into play the function of emulsion splitter to greatest extent, to reduce the consumption of emulsion splitter.Divide the interior hydraulic detention time of matter equalizing tank according to the desirable HRT=1～10d of wastewater flow rate size.
Emulsifiable oil waste water after minute matter equalizing tank 1 is handled links to each other with breakdown of emulsion pond water inlet pipe 18 through minute matter equalizing tank rising pipe 17, reacts with emulsion splitter in breakdown of emulsion pond 2, and the limitans of emulsification oil droplet is destroyed, forms big oil dripping pearl, emerges.The structure in breakdown of emulsion pond 2 as shown in Figure 4, breakdown of emulsion pond 2 is circular stainless steel or carbon steel jar, whipping appts 12 is established at the top.What be connected with tank body has four to five kinds of pipelines that are positioned at different heights, is followed successively by from high to low: upflow tube 22, scum silica frost pipe 19, water shoot 20, sediment pipe 21.Wherein water shoot can set up 2～3 separately again on different heights.If branch matter equalizing tank lift pump has return line, upflow tube can not established.The present invention adopts chemical demulsification method, guarantee to enter behind the breakdown of emulsion oily(waste)water COD＜2000mg/L, the oil＜600mg/L in membrane biological reaction pond.Breakdown of emulsion pond 2 operation scheme are: intermittently, operation in batches, and by manually or control automatically.
Middle pond 3 is steel construction or concrete structure, and is provided with nutritive salt throwing device 8, hydraulic detention time HRT=0.5～1d, in establish waste liquid lift pump 9.Water outlet behind the breaking milk and removing oil pumps into membrane biological reaction pond 4 through water shoot 20 pond 3 in the middle of flowing to via middle pond.Breakdown of emulsion pond 2 is the continuous mode operation for intermittent mode operation, membrane biological reaction pond 4, and therefore the effect in pond 3, centre is breakdown of emulsion ponds 2 and being connected and conversion of membrane biological reaction pond 4, guarantees the continuity of biological respinse with this.According to the co-degradation theory, in middle pond 3, add glucose or other easily biodegradable organicses.Add in the ratio of quality than waste water COD: glucose=1:1～0.5, and suitably replenish required N, the P nutritive salt of microorganism growth, its mass ratio is COD:N:P=100:5:1.In addition as required, also can in middle pond, regulate the pH value of waste water, to guarantee microbial growth requirement in the membrane biological reaction pond 4.
Waste water in the middle pond 3 is promoted to membrane biological reaction pond 4 by waste liquid lift pump 9.Membrane biological reaction pond 4 is steel construction or concrete structure, and inside is separated but communicated, and is divided into membrane cisterna and oxidation pond.Membrane module is 13 1 groups in the built-in board-like liquid of membrane cisterna, and one group is multi-disc, counts difference according to the different sheets of the water yield.Lay many group high-efficiency aerators 23 in the oxidation pond, be the microorganism oxygen supply.Because film has good mud-water separation characteristic, sludge concentration is 10～20g/L in the membrane biological reaction pond 4, far above ordinary activated sludge oxidation pond 3～4g/L.In membrane biological reaction pond 4, a large amount of microorganisms is the metabolism that earns a bare living of first nutraceutical matrix with easily biodegradable organicses such as glucose, simultaneously the oil in the waste water is removed as co-degradation matrix is collaborative.Again because the distinctive cross-flow filtration cleaning function of film in the board-like liquid, with and isolating be active sludge flco and water, rather than oil molecule and water molecules have alleviated the film possibility of jamming greatly, make that the diaphragm-operated life-span was 7～10 years in the board-like liquid.
Scum silica frost behind the breakdown of emulsion, sediment and membrane biological reaction pond excess sludge all enter mud storage pool 5, deliver to water extracter 6 by sludge pump 11 again and dewater.Chemical sludge and active sludge mixed dehydration help strengthening sludge dewatering effect, mud good stability, have reduced second environmental pollution.
The oily(waste)water that embodiment 1 handles is internal-combustion engine plant's emulsified oils, COD＜15000mg/L, oil concentration＜3000mg/L.Day output 3.2t/d.
Implement according to the following steps:
1) in minute matter equalizing tank regulating pondage, exclude the upper strata oil slick;
The high-concentration emulsified oil waste liquid enters and is stored in the branch matter equalizing tank pending, and hydraulic detention time 10d can play the water quality and quantity effect of regulating.Waste water oil slick is at the middle and upper levels tackled by oil separating plate, again by manually regularly removing or be provided with the automatic skim of floater oil skimmer.1.0m place submersible sewage pump is promoted to the breakdown of emulsion pond to the emulsifiable oil waste water of removing oil slick at the bottom of the pond by being arranged in, the impurity that the proportion that may have in the raw wastewater is bigger, be sunken to the pond as sediment at the bottom of, regularly remove.
2) waste water that will exclude behind the oil slick of upper strata pumps into the breakdown of emulsion pond, adds the chemical agent breakdown of emulsion;
The waste water of above-mentioned steps enters breakdown of emulsion pond breakdown of emulsion, adopts unslaked lime (CaO) as emulsion splitter, and injected volume is 10g/L.The intermittent operation of breakdown of emulsion pond, one-period working time is 2.5h, wherein the reaction times is controlled at 0.5h with interior, time of repose 1.0h, water discharge time 0.5h.The present embodiment operation steps is: branch matter equalizing tank lift pump pumps into the breakdown of emulsion pond with oily(waste)water, stops into water to the breakdown of emulsion pond during liquid level, quantitatively pumps into CaO emulsion by volume pump in the pond simultaneously.Subsequently, open breakdown of emulsion pond agitator motor, make the reaction of waste water and emulsion splitter generation breakdown of emulsion.Reaction times 0.5h when reaction finishes, stops agitator motor, begins to leave standstill.After leaving standstill 1.0h, open scum silica frost tube valve, sediment tube valve respectively, enter the mud storage pool by scum silica frost, the sediment of gravity after with breakdown of emulsion; Open again the clear liquid of water shoot after with breakdown of emulsion enter in the middle of the pond.
3) waste water behind the breakdown of emulsion pond is pumped into middle pond and do short stay, pump into the membrane biological reaction pond again;
Pond in the middle of clear liquid behind the breakdown of emulsion enters by gravity, tank waterpower residence time HRT=1.0d in the middle of the present embodiment.Middle pond is the tie of getting in touch between breakdown of emulsion pond and the membrane biological reaction pond of moving continuously of intermittent operation, and provides suitable place for adding of nutritive salt.According to the co-degradation theory, in middle pond, add glucose, in the present embodiment, in the 1kg waste water COD: the ratio of 1kg glucose adds, and suitably adds a certain amount of bicarbonate of ammonia and primary ammonium phosphate, to replenish required N, the P of microorganism growth.
4) waste water behind the breakdown of emulsion is able to further oil removing, degraded COD in the membrane biological reaction pond, and the water after the processing is directly effluxed by the film suction pump through membrane sepn.
Through oil removal, breakdown of emulsion, fully the supplement the nutrients waste water of salt is sent in the membrane biological reaction pond by middle pond lift pump, under the metabolism of huge amount active sludge, the co-degradation reaction takes place in the membrane biological reaction pond, pollutents such as the oil in the waste water, tensio-active agent are when easily biodegradable organics is utilized by microorganism growth, decomposed by synergistic oxidation, be able to remove the degradation production carbonic acid gas of oil from waste water at all.Filter via membrane module, treating water thoroughly separates with active sludge, is directly effluxed by suction pump.In the present embodiment, sludge concentration is 15g/L in the pond, and the reaction tank volumetric loading is 4.5kgCOD/ (m
3.d); Average water inlet COD=1768mg/L, oily ≈ 589mg/L, average film water outlet COD=78.5mg/L, oil＜10mg/L reaches emission standard.Membrane biological reaction pond operation result is seen Fig. 2.
5) chemical sludge behind the breakdown of emulsion, membrane biological reaction pond residual active sludge drain into the mud storage pool, are dewatered by sludge pumping to plate-and-frame filter press, and pressing filtering liquid returns branch matter equalizing tank, the mud cake outward transport.
Scum silica frost behind the breakdown of emulsion, sediment and membrane biological reaction pond excess sludge all enter the mud storage pool.The sludge quantity that the breakdown of emulsion pond produces approximates the dosage of medicament, and surplus sludge volume is about chemical sludge and active sludge mixed dehydration, also helps to strengthen sludge dewatering effect, mud good stability, has reduced second environmental pollution.Present embodiment produces scum silica frost and is about 0.28m
3/ d produces excess sludge and is about 0.2m
3/ d adds up to 0.48m
3/ d, work every day of sheet frame water extracter once.
Embodiment 2
Reference example 1, implementation step is with embodiment 1.The oily(waste)water that embodiment 2 handles is foundry's remover, scavenging solution oily(waste)water, and remover COD concentration is about 20000～40000mg/L, and scavenging solution COD concentration is about 2000～4000mg/L.Because that produces is intermittent and uncertain, entering two strands of treatment system, to come the ratio of water (remover and scavenging solution) be uncertain and not timing.
Oily(waste)water enters branch matter equalizing tank, breakdown of emulsion pond, middle pond, membrane biological reaction successively and handles in the pond, and the mud of generation enters successively in storage basin, the water extracter and handles.Day output is 24t/d, and branch matter equalizing tank hydraulic detention time is 1 day, and emulsion splitter is selected Ca (OH) for use
2And FeCl
3Middle pond is a carbon steel structure, and the top is provided with whipping appts, and in the present embodiment, in the 1kg waste water COD: the ratio of 0.5～1.0kg glucose adds, and suitably adds a certain amount of bicarbonate of ammonia and primary ammonium phosphate, with additional required N, the P of microorganism growth in the pond in.And add acid and carry out pH regulator, pond water outlet pH=7～9 in the middle of making.The membrane biological reaction pond is provided with in the board-like liquid one group of membrane module, and 75, membrane flux is 0.32m
3/ sheet .d.Treatment effect is: water outlet COD is about 3000mg/L behind the breakdown of emulsion, membrane cisterna final outflow water COD＜100mg/L.
Claims (3)
1, a kind of emulsifiable oil waste water treatment process is characterized in that it may further comprise the steps successively:
1), in minute matter equalizing tank regulating pondage, exclude the upper strata oil slick;
2), the waste water that excludes behind the oil slick of upper strata pumps into the breakdown of emulsion pond, adds the chemical agent breakdown of emulsion;
3) pond in the middle of, the gravity flow of the waste water behind the breakdown of emulsion pond enters, in the middle of described, drop into easily biodegradable organics in the pond, and required nitrogen N and the phosphorus P nutritive salt of additional microorganism growth, after the short stay, pump into the membrane biological reaction pond again, described easily biodegradable organics is a glucose, and described nitrogen N and phosphorus P nutritive salt are bicarbonate of ammonia and primary ammonium phosphate;
4), the waste water behind the breakdown of emulsion is able to further oil removing, degraded COD in the membrane biological reaction pond, the water after the processing is directly effluxed by the film suction pump through membrane sepn;
5), chemical sludge and membrane biological reaction pond residual active sludge behind the breakdown of emulsion carry out processed by sludge treating system, pressing filtering liquid returns branch matter equalizing tank, the mud cake outward transport.
2, emulsifiable oil waste water treatment process according to claim 1 is characterized in that: the ratio that adds of the described easily biodegradable organics glucose of step 3) is by the 1kg waste water COD: 0.5～1.0kg glucose.
3, emulsifiable oil waste water treatment process according to claim 1 and 2 is characterized in that:
Described minute interior hydraulic detention time of matter equalizing tank of step 1) got HRT=1～10d according to the wastewater flow rate size;
Step 2) described breakdown of emulsion pond operation scheme be intermittently, operation in batches, be 1.5～4.0h batch working time, by manually or control automatically;
Pool inner water power residence time HRT=0.5～1d in the middle of step 3) is described;
In the described membrane biological reaction of the step 4) pond, utilize the co-degradation principle, a large amount of microorganisms is the metabolism that earns a bare living of first nutraceutical matrix with the glucose easily biodegradable organics, simultaneously the oil in the waste water removed as co-degradation matrix is collaborative, and with active sludge flco and water sepn;
Scum silica frost behind the step 5) breakdown of emulsion, sediment and membrane biological reaction pond residual active sludge all enter the mud storage pool, deliver to plate-and-frame filter press by the mud spiral pump again or the belt sludge dewatering equipment dewaters, and pressing filtering liquid is back to branch matter equalizing tank and handles again, the mud cake outward transport.
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| CN102139969B (en) * | 2011-05-11 | 2012-10-10 | 上海膜达克环保工程有限公司 | Emulsified oil waste water treatment system and process |
| CN102372327B (en) * | 2011-09-30 | 2013-03-27 | 于文 | Method and device for removing sewage scum |
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| CN109694142A (en) * | 2017-10-23 | 2019-04-30 | 周鼎力 | A kind of separating equipment for purification of rolling emulsifying waste water |
| CN110117125A (en) * | 2018-12-18 | 2019-08-13 | 贵州省材料产业技术研究院 | Machine oil waste water high-efficiency processing unit and method |
| CN111943374A (en) * | 2020-08-05 | 2020-11-17 | 铜陵长江铜业有限公司 | Harmless treatment, recycling and reusing method for waste wire drawing oil |
| CN112607962A (en) * | 2020-12-04 | 2021-04-06 | 上海天汉环境资源有限公司 | Emulsion wastewater treatment method and system |
| CN113060884B (en) * | 2021-03-25 | 2022-11-25 | 中汇金源（北京）科技发展有限公司 | Petrochemical oily sewage and oil sludge purifying and recycling system |
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