CN215161630U

CN215161630U - Total-quantification treatment system for reverse osmosis concentrated solution of refuse leachate of incineration plant

Info

Publication number: CN215161630U
Application number: CN202120232762.XU
Authority: CN
Inventors: 寻瑶; 匡健敏; 吴亚彬
Original assignee: Puxiang Bioenergy Co ltd
Current assignee: Puxiang Bioenergy Co ltd
Priority date: 2021-01-27
Filing date: 2021-01-27
Publication date: 2021-12-14
Anticipated expiration: 2031-01-27

Abstract

The utility model discloses a burn factory landfill leachate reverse osmosis concentrate full-scale processing system, processing system includes that caustic soda adds feeder apparatus, PAM adds feeder apparatus, sour reverse osmosis concentrate storage device who adds feeder apparatus and communicate in proper order, aeration equipment, coagulating sedimentation device, filter equipment, DTRO minimizing means and back spray device, be equipped with first pipeline mixer between aeration equipment and the coagulating sedimentation device, caustic soda adds feeder apparatus, PAM adds feeder apparatus and communicates with first pipeline mixer respectively, be equipped with second pipeline mixer between coagulating sedimentation device and the filter equipment, sour feeder apparatus and second pipeline mixer intercommunication of adding. The utility model discloses a system operation cost is low, and full quantization treatment is effectual, can effectively reduce the dirty stifled composition of membrane in the reverse osmosis concentrate, ensures the high-efficient steady operation of rear end minimizing means.

Description

Total-quantification treatment system for reverse osmosis concentrated solution of refuse leachate of incineration plant

Technical Field

The utility model belongs to the technical field of sewage treatment, a processing system of reverse osmosis concentrate is related to, concretely relates to domestic waste burns factory landfill leachate reverse osmosis concentrate full-scale processing system.

Background

The leachate of the domestic garbage incineration plant is mainly treated by a combined process of anaerobic treatment, biochemical treatment and advanced treatment, the advanced treatment mainly comprises nanofiltration and reverse osmosis treatment processes, the two treatment processes can generate concentrated solution with a certain proportion due to the characteristics of selected membranes, and the concentrated solution is a pollutant concentrated and enriched product after the leachate is subjected to biochemical treatment and is characterized by high salinity, high heavy metal ions, high hardness, easy scaling, large content of organic matters difficult to biochemically degrade, high conductivity (mu s/cm) of tens of thousands or even hundreds of thousands, difficult treatment and high cost.

With the increasing national requirements for pollutant reduction, the trend of zero emission in the field of leachate treatment is increasingly obvious, the treated produced water can be reused as industrial water in a plant after reaching the standard, and the proper treatment of the concentrated solution becomes the greatest difficulty of zero emission.

At present, the common treatment methods of the concentrated solution comprise the following steps:

1. recharge method/back spray method. The recharge is a common concentrated solution disposal method for a landfill, and long-term recharge can cause the integral increase of the salt content of the landfill, the biodegradability of leachate is reduced, and great hidden dangers exist in long term consideration. The back spraying is a common concentrated solution disposal method for an incineration plant, the concentrated solution is quickly evaporated by using the heat of the incinerator, but the back spraying amount is greatly influenced by the heat value of the garbage and the incineration working condition, is not easy to be overlarge, and also continuously pays attention to the corrosion condition of a hearth.

2. Further concentration mainly comprises an evaporation technology and a membrane reduction technology. The evaporation technology utilizes high temperature to solidify the pollutants in the concentrated solution, realizes the maximum concentration and reduction, but has the defects of easy scaling of equipment, frequent maintenance, heat source and large amount of medicaments, high operation cost and the like. The membrane reduction technology further concentrates the concentrated solution through a high-pressure reverse osmosis technology to reduce the water quantity, is generally matched with back spray or outward transportation treatment, also has the defects of easy scaling and high failure rate, and the existing membrane technology has upper limit requirements on the indexes of water inflow pollutants.

3. Advanced oxidation technology. Hydroxyl radical is used as main oxidant to break and oxidize long chain of organic matter difficult to degrade in water, decompose macro molecule into micro molecule, and mineralize to form CO₂、H₂O or mineral salt, but only has the function of removing organic matters in the concentrated solution, and high salt in the produced water cannot be removed, so that the method needs to be matched with other processes for use.

The reverse osmosis process of the percolate of the incineration plant treats the produced water of the nanofiltration process and has the interception function on divalent ions and monovalent ions, so that the reverse osmosis concentrated solution has relatively high indexes of pollutants such as conductivity, total hardness, TDS (total dissolved solids), silicon dioxide and the like. The conductivity of the nanofiltration concentrated solution is 15 ms/cm-25 ms/cm, the conductivity of the reverse osmosis concentrated solution can reach 100ms/cm, the tolerant conductivity of the concentration side of the membrane of the existing concentrated solution reduction device is not more than 110ms/cm at most, and the water inlet conductivity is not more than 50 ms/cm. Therefore, there is a need to develop a treatment system suitable for reverse osmosis concentrated solution of landfill leachate in incineration plants.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is overcome prior art not enough, the water quality condition to reverse osmosis concentrate conductivity height, hardness is big, silica is high very much, provide one kind can reduce by a wide margin and add medicine cost and easy scale deposit material, full quantization processing is effectual, can effectively reduce the dirty stifled composition of membrane in the reverse osmosis concentrate, guarantee rear end minimizing means's high-efficient steady operation, reduce membrane cleaning frequency, prolong the life's of membrane refuse leachate reverse osmosis concentrate full quantization processing system of incineration plant.

In order to solve the technical problem, the utility model adopts the following technical scheme.

The utility model provides a full quantization processing system of incineration plant landfill leachate reverse osmosis concentrate, includes that caustic soda is thrown feeder apparatus, PAM and is thrown feeder apparatus, sour feeder apparatus and reverse osmosis concentrate storage device, aeration equipment, coagulating sedimentation device, filter equipment, DTRO minimizing means and the back spray device that communicate in proper order, aeration equipment with be equipped with first line mixer between the coagulating sedimentation device, caustic soda is thrown feeder apparatus, PAM and is thrown feeder apparatus respectively with first line mixer intercommunication, coagulating sedimentation device with be equipped with second line mixer between the filter equipment, sour feeder apparatus with second line mixer intercommunication.

As a further improvement of the above technical solution, the caustic soda liquid adding device includes a caustic soda liquid storage device, a first pipeline and a first dosing pump, the caustic soda liquid storage device is communicated with the first pipeline mixer through the first pipeline, and the first dosing pump is disposed on the first pipeline.

As a further improvement of the technical scheme, the PAM feeding device comprises a PAM storage device, a second pipeline and a second dosing pump, the PAM storage device is communicated with the first pipeline mixer through the second pipeline, and the second dosing pump is arranged on the second pipeline.

As a further improvement of the above technical solution, the acid adding device includes an acid storage device, a third pipeline and a third dosing pump, the acid storage device is communicated with the second pipeline mixer through the third pipeline, and the third dosing pump is disposed on the third pipeline.

As a further improvement of the technical scheme, a reaction chamber and an inclined plate sedimentation tank which are communicated with each other are arranged in the coagulating sedimentation device, the reaction chamber is communicated with the first pipeline mixer, the inclined plate sedimentation tank is provided with a clear liquid outlet and a sedimentation outlet, the clear liquid outlet is communicated with the second pipeline mixer, and the sedimentation outlet is communicated with a sludge treatment device.

As a further improvement of the technical scheme, a first lifting pump is arranged between the clear liquid outlet and the second pipeline mixer, a sludge discharge pump is arranged between the sedimentation outlet and the sludge treatment device, the sludge treatment device is provided with a clear liquid outlet and a dry sludge outlet, the clear liquid outlet is communicated with a biochemical system, and the dry sludge outlet is communicated with a garbage pit.

As a further improvement of the above technical solution, a second lift pump is arranged between the reverse osmosis concentrated solution storage device and the aeration device, the aeration device is provided with a first outlet and a second outlet, an outlet pump is arranged between the first outlet and the first pipeline mixer, a fourth pipeline is arranged between the second outlet and the inlet of the aeration device, and a circulating pump is arranged on the fourth pipeline; and a fifth pipeline is arranged between the filtering device and the DTRO reducing device, and a pH meter is arranged on the fifth pipeline.

The utility model discloses in, PAM polyacrylamide promptly, the DTRO minimizing device also makes RO-DTRO concentrate minimizing device.

Compared with the prior art, the utility model has the advantages of:

1. to the condition that the easy scale deposit pollutant content such as incineration plant's filtration liquid reverse osmosis concentrate electric conductance is high, calcium magnesium hardness and silica is high, the utility model provides an economical and feasible concentrate full-scale processing system to satisfy the requirement of intaking of minimizing membrane unit. The utility model discloses a system can not only effectively reduce the dirty stifled composition of membrane in the reverse osmosis concentrate, and the high-efficient steady operation of guarantee rear end minimizing means reduces the membrane and washs the frequency, reduces the cleaner cost, prolongs the life of membrane, has still combined the supporting sludge treatment device of msw incineration plant and concentrate back to spout the device and has realized the full quantization processing of reverse osmosis concentrate, and the running cost is low, and the treatment effect is stable.

The utility model discloses an adopt aeration + liquid caustic soda to soften + PAM flocculation and precipitation + filterable design, can reduce the easy scale deposit material such as calcium magnesium hardness and silica of aquatic by a wide margin. The pretreated reverse osmosis concentrated solution can be suitable for the water inlet requirement of the existing RO-DTRO reduction device, the long-term stable operation of the unit is ensured, the quality of produced water is good, and the produced water recycling standard can be met. The concentrated solution after decrement can return and spout to burning furnace, returns and effectively alleviates boiler burning burden after the water spray volume reduces by a wide margin, and the sludge that preliminary treatment produced can be sent to the boiler and burn after getting into sludge treatment device centrifugal dehydration, is applicable to the msw incineration factory.

In the concentrated solution full-scale treatment system, the sequence of adding acid before aeration and then softening is not selected, although the alkalinity of aeration is reduced greatly after the acid is added, the applicant finds that the reverse osmosis concentrated solution is reduced to the same hardness after direct aeration and consumes less liquid alkali compared with the acid. This is due to the large amount of HCO after acid addition aeration₃ ^-(CO₃ ^2-) Is removed and added with an equal amount of liquid caustic soda

Although an equal amount of CO is generated₃ ^2-But according to ion balance

Therefore, compared with the direct aeration of the concentrated solution of the utility model, the acid is added for aeration to soften the residual HCO in the solution₃ ^-Less, HCO₃ ^-The ionization equilibrium shifts to the left, resulting in actual CO in solution₃ ^2-At a relatively low concentration, CaCO is formed₃Less and therefore higher hardness in solution. The utility model discloses choose for use earlier to set up aeration equipment, carry out the liquid caustic soda again and soften, saved the sodium hydroxide quantity on the one hand, avoided the front end to add sour input on the one hand, reduced the running cost by a wide margin, and the effect is not discounted. After the reverse osmosis concentrated solution is subjected to full-quantization treatment, the calcium hardness can be reduced by more than 90%, the magnesium hardness can be reduced by about 40%, and the silicon content can be reduced by about 60%, so that the stable operation of a rear-end reduction membrane unit can be effectively ensured, the membrane cleaning frequency is reduced, the cost of a cleaning agent is reduced, and the service life of the membrane is prolonged.

2. The utility model discloses the characteristic that combines reverse osmosis concentrate and burn the factory and possess certain concentrate and return and spout the space, designed suitable concentrate full quantization processing apparatus, can effectively reduce the dirty stifled relevant pollution index of membrane, cooperation concentrate minimizing device can be with the concentrated solution volume decrement half or more even, the concentrated solution after the reconcentration returns and spouts to burning furnace, realizes the full quantization processing of burn factory landfill leachate reverse osmosis concentrate.

The utility model is suitable for an burn the factory, utilize to burn burning furnace and have certain back to spout the space, nevertheless return the actual conditions that the volume of spouting too big can influence the burning operating mode, through DTRO decrement device decrement half or more even after with reverse osmosis concentrate preliminary treatment, can reduce the actual production volume of concentrate, alleviate the boiler and return and spout pressure. Sludge generated by the pretreatment of the reverse osmosis concentrated solution can enter a furnace for incineration after centrifugal dehydration, and the water quality of the reduced produced water is relatively good and meets the requirement of in-plant recycling after being mixed with the total clear liquid, so that the full-scale treatment of the reverse osmosis concentrated solution of the incineration plant is realized.

3. The utility model discloses make full use of the equipment that burns the factory, equipment investment cost is very low, has only newly increased aeration equipment, the utility model provides an aeration equipment is through disposing the circulating pump, guarantees the aeration effect under the limited condition of aeration equipment volume, has reduced occupation of land and input cost.

Drawings

Fig. 1 is the utility model discloses in embodiment 1 incineration plant landfill leachate reverse osmosis concentrate full-scale processing system's schematic structure diagram.

Fig. 2 is a process flow diagram of the reverse osmosis concentrated solution full-scale treatment process of the landfill leachate of the incineration plant in the embodiment 1 of the utility model.

Illustration of the drawings:

1. a reverse osmosis concentrate storage device; 2. an aeration device; 3. a liquid caustic soda storage device; 4. a PAM storage device; 5. a coagulating sedimentation device; 6. an acid storage device; 7. a filtration device; 8. a DTRO reducing device; 9. a back-spraying device; 10. a sludge treatment device; 11. a first line mixer; 12. a second line mixer; 13. a first conduit; 14. a first dosing pump; 15. a second conduit; 16. a second dosing pump; 17. a third pipeline; 18. a third dosing pump; 19. a reaction chamber; 20. a sloping plate sedimentation tank; 21. a clear liquid outlet; 22. a sediment outlet; 23. a first lift pump; 24. a sludge discharge pump; 25. a supernatant outlet; 26. a dry sludge outlet; 27. a biochemical system; 28. a garbage pit; 29. a second lift pump; 30. a first outlet; 31. a second outlet; 32. an outlet pump; 33. a fourth conduit; 34. a circulation pump; 35. a fifth pipeline; 36. and a pH meter.

Detailed Description

The invention will be further described with reference to the drawings and specific preferred embodiments without limiting the scope of the invention. The materials and instruments used in the following examples are commercially available unless otherwise specified.

Example 1

The utility model discloses a full quantitative processing system of incineration plant landfill leachate reverse osmosis concentrate, as shown in figure 1, throw the feeder apparatus including liquid alkali, PAM throws the feeder apparatus, sour reverse osmosis concentrate storage device 1 of throwing the feeder apparatus and communicate in proper order, aeration equipment 2, coagulating sedimentation device 5, filter equipment 7, DTRO minimizing means 8 and back spout device 9, be equipped with first pipeline mixer 11 between aeration equipment 2 and the coagulating sedimentation device 5, liquid alkali is thrown feeder apparatus 3, PAM throws feeder apparatus 4 and communicates with first pipeline mixer 11 respectively, be equipped with second pipeline mixer 12 between coagulating sedimentation device 5 and the filter equipment 7, sour feeder apparatus 6 and second pipeline mixer 12 intercommunication of throwing.

In this embodiment, the liquid caustic soda adding device includes a liquid caustic soda storage device 3, a first pipeline 13 and a first dosing pump 14, the liquid caustic soda storage device 3 is communicated with the first pipeline mixer 11 through the first pipeline 13, and the first dosing pump 14 is disposed on the first pipeline 13.

In this embodiment, PAM throws feeder apparatus includes PAM storage device 4, second pipeline 15 and second dosing pump 16, and PAM storage device 4 communicates with first pipeline mixer 11 through second pipeline 15, and second dosing pump 16 locates on second pipeline 15.

In this embodiment, the liquid caustic soda feeding device is preferably arranged at the front end of the PAM feeding device, so that the aerated concentrated solution is softened and then subjected to flocculation precipitation.

In this embodiment, the acid adding device includes an acid storage device 6, a third pipeline 17 and a third dosing pump 18, the acid storage device 6 is communicated with the second pipeline mixer 12 through the third pipeline 17, and the third dosing pump 18 is disposed on the third pipeline 17.

In this embodiment, the coagulating sedimentation device 5 is provided with a reaction chamber 19 and an inclined plate sedimentation tank 20 which are communicated with each other, the reaction chamber 19 is communicated with the first pipeline mixer 11, the inclined plate sedimentation tank 20 is provided with a clear liquid outlet 21 and a sedimentation outlet 22, the clear liquid outlet 21 is communicated with the second pipeline mixer 12, and the sedimentation outlet 22 is communicated with a sludge treatment device 10. The reaction chamber 19 is provided with a stirrer, so that the sodium hydroxide and PAM are fully reacted with the concentrated solution, the concentrated solution enters the lower part of the inclined plate precipitation chamber 20 through the communicating port and flows from bottom to top, and the precipitated colloid in the concentrated solution is deposited at the bottom and is discharged under the action of gravity.

In this embodiment, a first lift pump 23 is disposed between the clear liquid outlet 21 and the second pipeline mixer 12, a sludge pump 24 is disposed between the sedimentation outlet 22 and the sludge treatment device 10, the sludge treatment device 10 is provided with a clear liquid outlet 25 and a dry sludge outlet 26, the clear liquid outlet 25 is communicated with a biochemical system 27, and the dry sludge outlet 26 is communicated with a garbage pit 28. The sludge treatment device 10 is centrifugally dewatered to control the water content to be about 80 percent, and is sent into a garbage pit by a pump or a sludge vehicle and then is burnt in a furnace.

In this embodiment, a second lift pump 29 is disposed between the reverse osmosis concentrated solution storage device 1 and the aeration device 2, the aeration device 2 is provided with a first outlet 30 and a second outlet 31, an outlet pump 32 is disposed between the first outlet 30 and the first pipeline mixer 11, a fourth pipeline 33 is disposed between the second outlet 31 and the inlet of the aeration device 2, and a circulation pump 34 is disposed on the fourth pipeline 33.

In this embodiment, a fifth pipe 35 is provided between the filter device 7 and the DTRO reduction device 8, and a pH meter 36 is provided on the fifth pipe 35. The maximum operating pressure of the DTRO reducing device 8 is 90bar, the variable frequency adjustment is carried out, the principle that salt is not permeated through reverse osmosis membrane water is adopted, under the high-pressure state, most salt ions can be intercepted on the concentrated side to achieve the effect of removing salt, the yield of produced water is adjusted according to the quality of the inlet water and is generally not less than 50%, the produced water enters a clear liquid pool and the total clear liquid of front-end percolate to be recycled together, and the high-concentration concentrated liquid on the concentrated side enters a back-spraying device 9.

The workflow of the full-scale processing system of the embodiment is as follows:

the concentrated solution in the reverse osmosis concentrated solution storage device 1 is sent to the aeration device 2 through the second lift pump 29, and the aeration device 2 ensures that air is fully contacted with the concentrated solution through the action of the circulating pump 34 and an aeration fan (not shown in figure 1), so that the alkalinity is reduced by about 50%. The aerated concentrated solution is sent to a first pipeline mixer 11, reacts with liquid caustic soda added into the first pipeline mixer 11 by a liquid caustic soda adding device to soften, the hardness and silicon dioxide of the concentrated solution are reduced, precipitates are generated, an anionic PAM aqueous solution is added into the first pipeline mixer 11 by the PAM adding device, the mixed solution enters a coagulating sedimentation device 5 at the rear end after being mixed by the first pipeline mixer 11, the mixed solution is stirred in a reaction chamber 19 of the coagulating sedimentation device 5, the precipitated substances and colloidal particles are mutually condensed under the action of a PAM flocculating agent to increase the particles, floc alum flowers are formed, and the floc flowers grow to a certain volume and then are separated from water sedimentation under the action of gravity by an inclined plate sedimentation tank 20, so that mud-water separation is realized. The sediment at the bottom enters a sludge treatment device 10 matched with the percolate system through a sludge discharge pump 24, after centrifugal dehydration, the sediment enters a garbage pit along with dry sludge for incineration, and supernatant generated in the centrifugal dehydration process returns to a biochemical system 27. The supernatant of the coagulating sedimentation device 5 is sent to a second pipeline mixer 12, acid is added through an acid adding device to adjust the pH value to about 6.3, then the supernatant is sent to a filtering device 7 to remove residual small-particle colloidal substances in the concentrated solution (supernatant), and then the supernatant enters a DTRO (draw texturing yarn) reducing device 8 at the rear end (also used as an RO-DTRO concentrated solution reducing device), the concentrated solution after 50% reduction enters an incinerator of a back-spraying device 9 to be incinerated, and the produced water of the DTRO reducing device 8 is recycled together with the factory.

The system can effectively reduce membrane fouling and blocking components in the reverse osmosis concentrated solution, ensures efficient and stable operation of the rear-end reduction device, reduces membrane cleaning frequency, reduces the cost of cleaning agents, prolongs the service life of the membrane, and also combines a sludge treatment device and a concentrated solution back-spraying device matched with a waste incineration plant to realize full-scale treatment of the reverse osmosis concentrated solution, and simultaneously carries out process optimization on the water quality of the reverse osmosis concentrated solution, so that the operation cost is low, and the treatment effect is stable.

The reverse osmosis concentrated solution enters the aeration device 2 through the second lift pump 29, and CO in the water is blown in air₂Continuously escaping from liquid phase into gas phase, carbonic acidThe equilibrium shift results in HCO in the concentrate₃ ^-And CO₃ ^2-The alkalinity is reduced continuously, and the subsequent adding amount of the sodium hydroxide is effectively reduced.

The water in the aeration device 2 is sent into a reaction chamber 19 of the coagulating sedimentation device 5 through a first pipeline mixer 11, a proper amount of medicament is added into the first pipeline mixer 11 through a liquid caustic soda adding device and a PAM adding device for fully mixing, sodium hydroxide reacts with calcium and magnesium ions in the concentrated solution, the total hardness is greatly reduced, active silicon in the water is reduced, the calcium hardness can be reduced by about 90%, the magnesium hardness can be reduced by about 40%, and the silicon content can be reduced by about 60%. The resulting precipitate forms larger flakes and begins to agglomerate in the reaction chamber 19 by the action of the stirrer and the PAM reaction.

The reaction chamber 19 in the coagulating sedimentation device 5 is communicated with the inclined plate sedimentation tank 20, the precipitated colloidal substances in water are deposited at the bottom under the action of gravity, the precipitated colloidal substances are sent into the sludge treatment device 10 through the sludge discharge pump 24, the pH of the supernatant is adjusted to about 6.3 through the acid adding device, the scaling condition of the membrane is effectively reduced, the small-particle colloidal substances in the supernatant are removed through the filtering device 7 and then enter the DTRO (digital terrestrial television ro) reduction device at the rear end, the high-concentration concentrated solution after about 50% reduction is sent into the back-spraying device 9, the high-concentration concentrated solution is fully atomized in the back-spraying device 9 and then enters the hearth for incineration, and the produced water is recycled in a clear solution tank factory. The back-spraying device is provided with industrial water as a standby water source, so that flexible switching is realized.

The utility model discloses an it can be in the factory full quantization processing to burn reverse osmosis concentrate of factory to adopt the system design mode.

The following is an application example of the reverse osmosis concentrated solution full-scale treatment system for the landfill leachate of the incineration plant of the embodiment, and the process flow is shown in fig. 2:

the water quality index of the initial reverse osmosis concentrate is shown in table 1.

TABLE 1 Water quality index of reverse osmosis concentrate

By adopting the present embodimentIn the total quantification system of example, aeration was carried out for 30min, and the pH was 8.5, the alkalinity (mmol/L) was 67.5, and the total hardness (CaCO)₃Measured mg/L) is 5600, 0.5mL of liquid alkali with the mass fraction of 30% is added, 0.7mL of anionic PAM aqueous solution with the mass fraction of 0.2% is added, after softening and flocculation, the total hardness of effluent water is reduced from 5600mg/L to 3040mg/L, the silicon content is reduced from 64.4mg/L to 29mg/L, the calcium content is 60mg/L, the magnesium content is 693mg/L, the calcium hardness is reduced by 95%, the magnesium hardness is reduced by 47%, the silicon content is reduced by 55%, the pH of flocculated effluent supernatant is 9.74, acid is added to adjust the pH to 6.3, and 31% (mass fraction) hydrochloric acid is consumed per ton of water by 3.6L.

In the embodiment, a large amount of white turbid substances are generated after aeration, the circulating pump can ensure the retention time and the aeration effect of the concentrated solution, and the alkalinity in water can be effectively reduced through aeration, so that the adding amount of subsequent sodium hydroxide is reduced, and the operation cost is effectively reduced. The main principle is as follows:

CO exists in water₂、H₂CO₃、HCO₃ ^-、CO₃ ^2-Is in equilibrium with carbonic acid, actually H₂CO₃Of a very low content, mainly soluble, gaseous CO₂They may be converted to each other before. When in aeration, the air bubbles are fully contacted with water, and CO in the water₂Continuously escaping from liquid phase into gas phase, moving leftwards in equilibrium, HCO in water₃ ^-And CO₃ ^2-The alkalinity is continuously reduced.

The liquid caustic soda is added for softening, so that calcium and magnesium ions in the concentrated solution are reduced, and scaling factors are reduced. The main principle is as follows:

CO₃ ^2-+Ca²⁺＝CaCO₃+H₂O (5)

Mg²⁺+OH^-＝Mg(OH)₂ (6)

after the sodium hydroxide is added, the chemical equilibrium of (4) is shifted to the right, and CO is added into the water₃ ^2-Increased presence of Ca in the reverse osmosis concentrate²⁺Reaction to form CaCO₃Precipitation with formation of small amounts of Ca (OH)₂A sparingly soluble substance. OH group^-With Mg in the concentrate²⁺Reaction to form Mg (OH)₂And (4) precipitating. After the addition of sodium hydroxide, the pH increased and the active silicon in the water decreased.

The flocculant is added to lead the suspended particles in the water to lose stability, the colloidal particles are mutually condensed to enlarge the particles to form floccules alum flocs, and the floccules alum flocs are separated from water sediment under the action of gravity after growing to a certain volume, thereby removing a large amount of suspended matters in the water. Anion PAM is added in the flocculation precipitation, and experiments show that compared with cation PAM with high price, 800 ten thousand of anions are adopted, the cost is lower, the flocculation effect is better, and the amount of generated sludge is less. The generated sludge can be directly treated by a sludge treatment device matched with a leachate system, equipment of a flocculant preparation and adding device can be shared, the system is simple, and the investment is reduced.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. Those skilled in the art can make numerous changes and modifications to the disclosed embodiments, or modify equivalent embodiments, without departing from the spirit and scope of the invention, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments by the technical entity of the present invention all still belong to the protection scope of the technical solution of the present invention.

Claims

1. The utility model provides a full quantization processing system of incineration plant landfill leachate reverse osmosis concentrate, its characterized in that, throw feeder apparatus, PAM and throw feeder apparatus and reverse osmosis concentrate storage device (1), aeration equipment (2), coagulating sedimentation device (5), filter equipment (7), DTRO minimizing means (8) and back that communicate in proper order and spout device (9) including caustic soda, aeration equipment (2) with be equipped with first pipeline mixer (11) between coagulating sedimentation device (5), caustic soda throw feeder apparatus, PAM throw feeder apparatus respectively with first pipeline mixer (11) intercommunication, coagulating sedimentation device (5) with be equipped with second pipeline mixer (12) between filter equipment (7), sour throw feeder apparatus with second pipeline mixer (12) intercommunication.

2. The system for the full-scale treatment of the reverse osmosis concentrated solution of the landfill leachate of the incineration plant according to claim 1, wherein the caustic soda dosing device comprises a caustic soda storage device (3), a first pipeline (13) and a first dosing pump (14), the caustic soda storage device (3) is communicated with the first pipeline mixer (11) through the first pipeline (13), and the first dosing pump (14) is arranged on the first pipeline (13).

3. The system for the full-scale treatment of the reverse osmosis concentrated solution of the landfill leachate of the incineration plant according to the claim 2, wherein the PAM adding device comprises a PAM storage device (4), a second pipeline (15) and a second adding pump (16), the PAM storage device (4) is communicated with the first pipeline mixer (11) through the second pipeline (15), and the second adding pump (16) is arranged on the second pipeline (15).

4. The system for the full-scale treatment of the reverse osmosis concentrated solution of the landfill leachate of the incineration plant according to the claim 3, wherein the acid adding device comprises an acid storage device (6), a third pipeline (17) and a third adding pump (18), the acid storage device (6) is communicated with the second pipeline mixer (12) through the third pipeline (17), and the third adding pump (18) is arranged on the third pipeline (17).

5. The reverse osmosis concentrated liquor full-scale treatment system for landfill leachate of an incineration plant according to any one of claims 1 to 4, characterized in that a reaction chamber (19) and an inclined plate sedimentation tank (20) which are communicated with each other are arranged in the coagulating sedimentation device (5), the reaction chamber (19) is communicated with the first pipeline mixer (11), the inclined plate sedimentation tank (20) is provided with a clear liquid outlet (21) and a sedimentation outlet (22), the clear liquid outlet (21) is communicated with the second pipeline mixer (12), and the sedimentation outlet (22) is communicated with a sludge treatment device (10).

6. The system for the full-scale treatment of reverse osmosis concentrated liquor of landfill leachate of an incineration plant according to claim 5, wherein a first lift pump (23) is arranged between the clear liquid outlet (21) and the second pipeline mixer (12), a sludge pump (24) is arranged between the sedimentation outlet (22) and the sludge treatment device (10), the sludge treatment device (10) is provided with a clear liquid outlet (25) and a dry sludge outlet (26), the clear liquid outlet (25) is communicated with a biochemical system (27), and the dry sludge outlet (26) is communicated with a garbage pit (28).

7. The system for the full-scale treatment of reverse osmosis concentrated solution of landfill leachate of an incineration plant according to any one of claims 1 to 4, characterized in that a second lift pump (29) is arranged between the reverse osmosis concentrated solution storage device (1) and the aeration device (2), the aeration device (2) is provided with a first outlet (30) and a second outlet (31), an outlet pump (32) is arranged between the first outlet (30) and the first pipeline mixer (11), a fourth pipeline (33) is arranged between the second outlet (31) and the inlet of the aeration device (2), and a circulating pump (34) is arranged on the fourth pipeline (33); and a fifth pipeline (35) is arranged between the filtering device (7) and the DTRO reducing device (8), and a pH meter (36) is arranged on the fifth pipeline (35).