CN113072229A - Full-quantitative treatment method for landfill leachate - Google Patents
Full-quantitative treatment method for landfill leachate Download PDFInfo
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- CN113072229A CN113072229A CN202011627482.5A CN202011627482A CN113072229A CN 113072229 A CN113072229 A CN 113072229A CN 202011627482 A CN202011627482 A CN 202011627482A CN 113072229 A CN113072229 A CN 113072229A
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- 238000001223 reverse osmosis Methods 0.000 claims abstract description 67
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- 238000000354 decomposition reaction Methods 0.000 claims description 3
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Images
Classifications
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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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
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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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
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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
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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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
- C02F2103/06—Contaminated groundwater or leachate
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/043—Treatment of partial or bypass streams
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention provides a full-quantitative treatment method of landfill leachate, which comprises the following steps: sequentially carrying out microfiltration treatment and multistage disc-tube type reverse osmosis device treatment on the landfill leachate to obtain a concentrated solution and a permeate; evaporating the concentrated solution to obtain an evaporation mother solution and condensed water; subjecting the condensed water to a circulation treatment, wherein the circulation treatment comprises: the condensed water is refluxed to the multistage disc tube type reverse osmosis device for osmosis treatment; pretreating the evaporation mother liquor to obtain a solution to be treated, wherein the pretreatment comprises one or more of filtration treatment, feeding and mixing treatment and deamination treatment; and performing final treatment on the liquid to be treated, wherein the final treatment comprises cement lime absorption curing treatment or cement kiln co-treatment. The method can carry out more complete treatment on the landfill leachate by matching various modes such as microbial treatment, deamination treatment, solidification treatment or cement kiln cooperative treatment for denitration and desulfurization and the like.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to a full-quantitative treatment method for landfill leachate.
Background
With the rapid development of economy and population growth in China, domestic garbage becomes one of the main factors of environmental pollution. The household garbage is combined with underground water, rainwater and the like to generate a large amount of garbage percolate, and most of the garbage percolate is aged garbage landfill percolate until now. The landfill leachate is tawny or black organic wastewater with foul smell, the garbage composition is complex, and the leachate contains a large amount of refractory organic matters, inorganic salts, various toxic and harmful pollutants and the like, so that a large amount of carbon sources are required for long-term potential harm biochemical treatment on the environment, animals, plants and human beings, and the treatment cost is greatly increased. In addition, the landfill leachate has low COD and BOD5High ammonia nitrogen content, poor biochemical performance and the like, and the biochemical treatment needs a large amount of additional carbon source, so that the treatment cost is greatly increased.
In order to solve the problems, at present, a disc-tube reverse osmosis device is mostly adopted to treat the landfill leachate so as to perform osmosis treatment on the landfill leachate to obtain a permeate. However, when the disc-tube reverse osmosis treatment is performed, membrane concentrated solution is generated, so that the landfill leachate is not completely treated, and secondary pollution is easily generated when the concentrated solution is not properly treated.
In view of the above, there is a need to provide a method for fully treating landfill leachate, so as to solve or at least alleviate the above technical drawbacks of incomplete treatment of landfill leachate.
Disclosure of Invention
The invention mainly aims to provide a full-quantitative treatment method for landfill leachate, and aims to solve the technical problem of incomplete treatment of the landfill leachate in the prior art.
In order to achieve the purpose, the invention provides a full-quantitative treatment method of landfill leachate, which comprises the following steps:
sequentially carrying out microfiltration treatment and multistage disc-tube type reverse osmosis device treatment on the landfill leachate to obtain a concentrated solution and a permeate; wherein, multistage dish tubular reverse osmosis unit handles including: sequentially permeating the garbage percolate subjected to microfiltration treatment by a multi-stage disc-tube type reverse osmosis treatment unit to obtain a concentrated solution remained after permeation by a first-stage disc-tube type reverse osmosis treatment unit, concentrated water remained after permeation by a subsequent disc-tube type reverse osmosis treatment unit and a permeate; and the concentrated water flows back to a water inlet pipeline of the first-stage disc-tube reverse osmosis treatment unit for circular osmosis treatment;
evaporating the concentrated solution to obtain an evaporation mother solution and condensed water; wherein the evaporation temperature of the evaporation treatment is 17-40 ℃;
subjecting the condensed water to a circulation treatment, wherein the circulation treatment comprises: the condensed water is refluxed to the multistage disc tube type reverse osmosis device for osmosis treatment;
pretreating the evaporation mother liquor to obtain a solution to be treated, wherein the pretreatment comprises one or more of filtration treatment, feeding and mixing treatment and deamination treatment; the feeding and mixing treatment comprises the following steps: and mixing part of the evaporation mother liquor with ammonium salt according to the mass ratio of 1: 0.2-0.5 to obtain the liquid to be treated serving as the denitration agent.
Performing final treatment on the liquid to be treated, wherein the final treatment comprises cement lime absorption curing treatment or cement kiln co-treatment; the cement kiln co-processing comprises the following steps: and spraying the solution to be treated serving as a denitration agent into a decomposition furnace in a cement kiln line for denitration.
Further, the pretreatment of the evaporation mother liquor further comprises: mixing the evaporation mother liquor with sulfate reducing bacteria, guiding the mixture to a culture chamber for reaction for 24-48h, separating heavy metal precipitate generated after the reaction in a standing mode, and guiding the evaporation mother liquor separated from the heavy metal precipitate to the pretreatment part.
Further, the multistage disc tube type reverse osmosis device treatment is a two-stage disc tube type reverse osmosis device treatment, and the two-stage disc tube type reverse osmosis device treatment comprises:
conveying the landfill leachate after the microfiltration treatment to the first-stage disc-tube reverse osmosis treatment unit for treatment to obtain a concentrated solution and a first-stage permeate;
conveying the first-stage permeate to the second-stage disc-tube type reverse osmosis treatment unit for treatment to obtain permeate and concentrated water;
and returning the concentrated water to a water inlet pipeline of the first-stage disc-tube reverse osmosis treatment unit for circular osmosis treatment.
Further, the operating pressure of the first-stage disc-tube type reverse osmosis treatment unit is 0-90 bar, and the operating pressure of the second-stage disc-tube type reverse osmosis treatment unit is 0-70 bar.
Further, the feed mixing process further comprises: mixing part of the evaporation mother liquor with water according to the ratio of 0.5-1: 1 to obtain the liquid to be treated serving as a mixed liquid; the cement kiln co-processing further comprises: and spraying the solution to be treated serving as the mixed solution into a waste incinerator of a cement kiln line.
Further, the feed mixing process further comprises: mixing part of the evaporation mother liquor with lime powder according to the mass ratio of 1: 0.5-0.7 to obtain the liquid to be treated serving as mixed slurry; the cement kiln co-processing further comprises: and spraying the solution to be treated serving as the mixed slurry into a decomposing furnace in a cement kiln line for desulfurization.
Further, the pretreatment is to perform the feeding and mixing treatment or sequentially perform the filtering treatment, the deamination treatment and the feeding and mixing treatment; and the final treatment is the cement kiln cooperative treatment.
Further, the pretreatment is to sequentially carry out filtration treatment and deamination treatment;
wherein the filtering process comprises: sequentially filtering the evaporation mother liquor in a secondary filtering device with gradually increased filtering precision to ensure that SS of the evaporation mother liquor is less than 5 mg/L;
the deamination treatment comprises the following steps: conveying the evaporation mother liquor after filtration treatment to a cartridge filter to obtain a solution to be deaminated; adjusting the pH value of the liquid to be deaminated to be more than 10.5 by adding alkali, so that ammonium salt in the liquid to be deaminated is converted into ammonia gas; and conveying the liquid to be deaminated after the alkali is added and the adjustment to a tertiary deamination membrane with concentrated sulfuric acid for deamination to obtain the liquid to be treated and ammonium sulfate.
Further, the final treatment is the cement lime absorption curing treatment, which includes:
mixing and stirring the liquid to be treated and a curing agent, and then conveying the mixture to a curing model for curing, wherein the curing agent comprises cement and lime;
and conveying the solidified liquid to be treated to a landfill site for landfill.
Further, the mass ratio of the curing agent to the liquid to be treated is 0.2-0.5: 1; the stirring and mixing time is 5-10 min; the curing time was 2 d.
Compared with the prior art, the invention has the following advantages:
the invention can more completely treat the landfill leachate, and the invention adopts a full-scale treatment process, and the landfill leachate is treated by a multistage disc-tube reverse osmosis device to obtain concentrated solution and permeate liquid meeting the discharge standard, so that the permeate liquid can be directly discharged, and the concentrated solution can be further treated; in the treatment of the multistage disc-tube reverse osmosis device, concentrated water can be subjected to circulating osmosis treatment, so that the overall osmosis efficiency of the landfill leachate is improved; the penetrating fluid is evaporated, and the condensed water after evaporation is subjected to the circulating treatment, so that the penetrating fluid is more completely treated.
In addition, through the microbial treatment, the evaporation mother liquor and the sulfate reducing bacteria are mixed and cultured to remove heavy metal ions in the penetrating fluid, so that the problems of continuous environmental pollution and personal injury caused by incapability of eradicating the subsequent heavy metal ions are solved; the evaporation mother liquor is filtered by a secondary filtering device, so that the SS of the evaporation mother liquor is less than 5mg/L, and the subsequent deamination treatment is facilitated; through carrying out the deamination is handled for ammonium salt in the evaporation mother liquor converts into the ammonia and absorbs through concentrated sulfuric acid and generates ammonium sulfate, thereby is used for the agricultural chemical fertilizer with the ammonium sulfate of retrieving, has not only realized the waste recycling, the production of ammonia when still having avoided subsequent processing. The cement and lime curing agent are added through the absorption and curing treatment of the cement and lime, so that ammonia gas is not generated, and secondary pollution is avoided; through the cement kiln coprocessing, can not only realize to the processing of concentrate and the cooling of spraying of burning furnace, can also realize the denitration desulfurization of cement kiln line, moreover, because of evaporation mother liquor contains the ammonium salt, can regard as the diluent of ammonium salt and do not influence denitration in the kiln, can also reduce nitrogen oxide's emission value, through will evaporation mother liquor and ammonium salt mix and form the denitrifier, both realized right evaporation mother liquor's reuse, realized high-efficient denitration again.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a full-scale treatment method for landfill leachate according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that all the directional indicators (such as the upper and lower … …) in the embodiment of the present invention are only used to explain the relative position relationship, movement, etc. of the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
Moreover, the technical solutions in the embodiments of the present invention may be combined with each other, but it is necessary to be able to be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent, and is not within the protection scope of the present invention.
As shown in fig. 1, the present invention provides a full-scale treatment method for landfill leachate, comprising:
and step S1, sequentially carrying out microfiltration treatment and multistage disc tube type reverse osmosis device treatment on the landfill leachate to obtain concentrated solution and permeate. Wherein, multistage dish tubular reverse osmosis unit handles including: sequentially permeating the garbage percolate subjected to microfiltration treatment by a multi-stage disc-tube type reverse osmosis treatment unit to obtain a concentrated solution remained after permeation by a first-stage disc-tube type reverse osmosis treatment unit, concentrated water remained after permeation by a subsequent disc-tube type reverse osmosis treatment unit and a permeate; and the concentrated water flows back to a water inlet pipeline of the first-stage disc-tube reverse osmosis treatment unit for circular osmosis treatment;
in the microfiltration treatment process, the microfiltration membrane that the microfiltration adopted has the hole even, and characteristics such as filtration precision is high, separation efficiency is high, the velocity of flow is fast can block a large amount of suspended solids, bacterium, for follow-up the quality of water of intaking that multistage dish tubular reverse osmosis unit handled provides the guarantee.
It should be understood by those skilled in the art that, because the flow rate or concentration of the wastewater varies greatly over different periods of time, the quality and quantity of the landfill leachate may also be adjusted by a conditioning tank prior to the microfiltration process to trap visible suspended matter, such as gravel, sludge, etc., and reduce SS.
The Disc Tube Reverse Osmosis unit is also known in the art as a DTRO unit and is collectively known in english as Disc Tube Reverse Osmosis. In the invention, the landfill leachate is treated by the multistage disc-tube reverse osmosis device, so that the landfill leachate can be subjected to multistage reverse osmosis treatment to obtain the permeate, the permeate is water which can reach the discharge standard, and each pollution index of the permeate is lower than pollution control standard of domestic garbage landfill (GB 16889-2008).
In addition, the multistage disc tube type reverse osmosis device can also be provided with a backwashing device, and the discharged permeate liquid is utilized for backwashing and medicine washing regularly.
Step S2, evaporating the concentrated solution to obtain evaporation mother liquor and condensed water; wherein the evaporation temperature of the evaporation treatment is 17-40 ℃.
The evaporation treatment is carried out in a steam mechanical recompression evaporation device, wherein the evaporation temperature is set to be 17-40 ℃ during the evaporation treatment, the water yield during the evaporation treatment is about 75-85%, and the water content of the mother liquor is about 45-55%.
Step S3, performing a circulation process on the condensed water, wherein the circulation process includes: and returning the condensed water to the multistage disc tube type reverse osmosis device for osmosis treatment.
Specifically, the condensed water generated by the evaporation treatment cannot be directly discharged, the first stage of the multistage disc-tube reverse osmosis device needs to be subjected to permeation treatment again when the condensed water flows back to obtain a qualified permeate liquid, and the permeate liquid can be discharged.
And step S4, pretreating the evaporation mother liquor to obtain a solution to be treated, wherein the pretreatment comprises one or more of filtration treatment, feeding and mixing treatment and deamination treatment.
Specifically, the filtration treatment is mainly to filter the evaporation mother liquor in a system with at least one stage of filtration device so as to sufficiently remove SS and ensure stable operation. The feeding and mixing mainly comprises mixing the evaporation mother liquor with other materials, and provides prerequisites for subsequent desulfurization and denitrification and the like. The deamination treatment is mainly to treat the mother liquor by a deamination membrane with concentrated sulfuric acid so as to realize the purpose of deamination.
In addition, in order to realize the removal of heavy metals, the pretreatment of the evaporation mother liquor further comprises the following steps: mixing the evaporation mother liquor with sulfate reducing bacteria, guiding the mixture to a culture chamber for reaction for 24-48h, separating heavy metal precipitate generated after the reaction in a standing mode, and guiding the evaporation mother liquor separated from the heavy metal precipitate to the pretreatment part.
Notably, the feed mixing process may include: mixing part of the evaporation mother liquor with ammonium salt according to the mass ratio of 1: 0.2-0.5 to obtain the solution to be treated serving as a denitration agent; the feed mixing process may also include: mixing part of the evaporation mother liquor with water according to the ratio of 0.5-1: 1 to obtain the liquid to be treated serving as a mixed liquid; the feed mixing process may further include: and mixing part of the evaporation mother liquor with lime powder according to the mass ratio of 1: 0.5-0.7 to obtain the liquid to be treated serving as mixed slurry.
And step S5, performing final treatment on the liquid to be treated, wherein the final treatment comprises cement lime absorption curing treatment or cement kiln synergistic treatment.
The final treatment is divided into a plurality of situations and respectively corresponds to different pretreatment modes, and the absorption and solidification treatment of the cement lime mainly buries the pretreated evaporation mother liquor after the absorption and solidification of the evaporation mother liquor by the cement lime; the cement kiln cooperative treatment is mainly characterized in that the evaporation mother liquor after pretreatment is sprayed into an incinerator and a cement line kiln tail decomposing furnace for cooperative treatment, and the evaporation mother liquor is used for spraying and cooling the incinerator and carrying out denitration or desulfurization in the decomposing furnace. Wherein, the cement kiln co-processing can be further divided into a plurality of situations according to different pre-processing.
Specifically, the cement kiln co-processing comprises the following steps: and spraying the solution to be treated serving as a denitration agent into a decomposition furnace in a cement kiln line for denitration. The cement kiln co-processing may also include: and spraying the solution to be treated serving as the mixed solution into a waste incinerator of a cement kiln line. The cement kiln co-processing may further comprise: and spraying the solution to be treated serving as the mixed slurry into a decomposing furnace in a cement kiln line for desulfurization.
Further, in the case where the pretreatment is the feed mixing treatment or the filtration treatment, the deamination treatment and the feed mixing treatment are sequentially performed; the final treatment may be the cement kiln co-treatment.
Preferably, the multistage disc-tube type reverse osmosis device treatment can be a two-stage disc-tube type reverse osmosis device treatment, the two-stage disc-tube type reverse osmosis device comprises a first-stage disc-tube type reverse osmosis treatment unit and a second-stage disc-tube type reverse osmosis treatment unit, and the two-stage disc-tube type reverse osmosis device is small in occupied area and high in recovery rate.
Further, the two-stage disc-tube reverse osmosis device comprises:
conveying the landfill leachate after the microfiltration treatment to the first-stage disc-tube reverse osmosis treatment unit for treatment to obtain a concentrated solution and a first-stage permeate;
conveying the first-stage permeate to the second-stage disc-tube type reverse osmosis treatment unit for treatment to obtain permeate and concentrated water;
and returning the concentrated water to a water inlet pipeline of the first-stage disc-tube reverse osmosis treatment unit for circular osmosis treatment.
In order to ensure the operation of the disc-tube type reverse osmosis treatment, the operation pressure of the first-stage disc-tube type reverse osmosis treatment unit is 0-90 bar, and the operation pressure of the second-stage disc-tube type reverse osmosis treatment unit is 0-70 bar.
When the operating pressure of the first-stage disc-tube type reverse osmosis treatment unit is 60bar, the water yield of the first-stage disc-tube type reverse osmosis treatment unit is about 75%, and when the operating pressure of the second-stage disc-tube type reverse osmosis treatment unit is 45bar, the water yield of the second-stage disc-tube type reverse osmosis treatment unit is about 90%.
As a preferred example of this embodiment, the pretreatment is a filtration treatment and a deamination treatment which are performed in this order.
Wherein the filtering process comprises: and sequentially filtering the evaporation mother liquor in a secondary filtering device with gradually increased filtering precision, so that the SS of the evaporation mother liquor is less than 5 mg/L.
Specifically, the secondary filtering device can be a sand filtering device and a fine filtering device, the evaporated mother liquor is filtered by the sand filtering device and the fine filtering device, the SS of the effluent can reach 4.26mg/L, and the water temperature is about 35 ℃.
The deamination treatment comprises the following steps: conveying the evaporation mother liquor after filtration treatment to a cartridge filter to obtain a solution to be deaminated; adjusting the pH of the liquid to be deaminated to be more than 10.5 by adding alkali, so that ammonium salt in the liquid to be deaminated is converted into ammonia gas, preferably, adjusting the pH of the liquid to be deaminated to be about 11 by adding alkali; and conveying the liquid to be deaminated after the alkali is added and adjusted to a third deamination membrane with concentrated sulfuric acid for deamination to obtain the liquid to be treated and ammonium sulfate, wherein the third deamination membrane can be connected in series for improving deamination effect. Wherein, the ammonia nitrogen of the effluent mother liquor reaches 4.68mg/L, the total nitrogen reaches 7.92mg/L, and the ammonium sulfate converted by the absorption of concentrated sulfuric acid of ammonia gas can be recycled for agricultural fertilizers.
The final treatment is the cement lime absorption curing treatment, and the curing treatment comprises the following steps:
mixing and stirring the liquid to be treated and a curing agent, and then conveying the mixture to a curing model for curing, wherein the curing agent comprises cement and lime;
and conveying the solidified liquid to be treated to a landfill site for landfill.
The mass ratio of the curing agent to the liquid to be treated is 0.2-0.5: 1; the stirring and mixing time is 5-10 min; the curing time was 2 d. Further, the liquid to be treated enters a curing system with curing agents of cement and lime, and the mass ratio of the curing agents to the liquid to be treated is 0.3: 1, mixing and stirring for 30 minutes, then conveying to a curing model, curing for two days until the water content is 25%, and then conveying to a landfill for landfill.
Further, when the pretreatment includes the filtration treatment and the deamination treatment, the final treatment may be a cement kiln co-treatment including:
dividing the liquid to be treated into a first liquid to be treated and a second liquid to be treated;
mixing the first solution to be treated with water according to a preset proportion and spraying the mixture into a garbage incinerator of the cement kiln; the first solution to be treated and water can be mixed according to the ratio of 0.5-1: 1, in a mass ratio of 1.
Mixing the second liquid to be treated with lime powder according to a preset proportion, and spraying the mixture into the kiln tail of the cement kiln for kiln tail desulfurization; the second to-be-treated liquid and the lime powder can be mixed according to the mass ratio of 1: 0.5-0.7, and the second to-be-treated liquid and the lime powder in the preset proportion are mixed to absorb acid gas in flue gas of a cement kiln line, so that the second to-be-treated liquid and the lime powder can be used for replacing water, reducing water consumption and improving economic benefits.
Notably, the pretreatment corresponding to the cement kiln co-treatment in this case includes the filtering treatment and the deamination treatment in sequence.
As another preferred example of the present embodiment, the pretreatment is the feed mixing treatment, and the liquid to be treated includes a mixed liquid, a denitration agent, and a mixed slurry.
The feeding and mixing treatment comprises the following steps: the evaporation mother liquor is divided into three parts and respectively mixed with corresponding materials.
Wherein the ratio of the first part of the evaporation mother liquor to water is (0.5-1): 1 to obtain a mixed solution; thereby prevent high-pressure pump pipeline scale deposit, block up, the mixed liquid after the atomizing can better combine together with the flue gas of high temperature burning, absorbs the flue gas heat, reduces the interior temperature of furnace.
Mixing a second part of the evaporation mother liquor with ammonium salt according to the mass ratio of 1: 0.2-0.5 to obtain a denitration agent; the ammonium salt can be ammonium sulfate, ammonium chloride, ammonium bicarbonate, ammonium carbonate and other ammonium salts, the evaporation mother liquor and the ammonium salt are mixed according to the mass ratio of 1: 0.2-0.5, and the evaporation mother liquor contains the ammonium salt, can be used as a diluent of the ammonium salt, does not influence denitration in a kiln, can reduce the emission value of nitrogen oxides, realizes reutilization and treatment of the evaporation mother liquor, and achieves the purpose of efficient denitration.
In addition, the evaporation mother liquor and the ammonium salt can be promoted to be mixed through a stirrer, and the denitration agent can be filtered by adopting a filtering device to filter a small amount of scale and precipitate generated by mixing the evaporation mother liquor and the ammonium salt.
And mixing the third part of the evaporation mother liquor with lime powder according to the mass ratio of 1: 0.5-0.7 to obtain mixed slurry, so that the mixed slurry is used for absorbing acid gas in the flue gas of the cement kiln line, and water can be replaced by the mass ratio, so that the water consumption is reduced, and the economic benefit is improved.
In order to make the evaporation mother liquor enter the cement kiln cooperative disposal system to carry out spraying and cooling, back-spraying cement kiln decomposing furnace system denitration or spraying and cooling, back-spraying cement kiln decomposing furnace system denitration and desulfurization treatment on the garbage incinerator.
When the pretreatment is the charging mixing treatment, the cement kiln co-treatment further comprises:
and spraying the mixed liquid into a garbage incinerator of the cement kiln to enable the mixed liquid to be atomized and then combined with high-temperature combustion smoke.
And respectively spraying the denitrifier and the mixed slurry into the kiln tail of the cement kiln for denitration and desulfurization of the kiln tail. Specifically, the denitration specifically comprises the following steps: in the cement kiln co-processing system, the pretreated evaporation mother liquor is sprayed into the kiln tail through a high-pressure pump for denitration of the kiln tail, and the denitration agent is utilized to reduce nitrogen oxides in flue gas to generate N2And H2O2(ii) a And the desulfurization refers to spraying the mixed slurry into the kiln tail through a high-pressure pump for kiln tail desulfurization, and absorbing acid gas in a cement kiln line by using the mixed slurry.
It is to be noted that the pretreatment corresponding to the cement kiln co-treatment in this case is the charge mixing treatment.
In the above technical solutions, the above are only preferred embodiments of the present invention, and the technical scope of the present invention is not limited thereby, and all the technical concepts of the present invention include the claims of the present invention, which are directly or indirectly applied to other related technical fields by using the equivalent structural changes made in the content of the description and the drawings of the present invention.
Claims (10)
1. A full-quantitative treatment method for landfill leachate is characterized by comprising the following steps:
sequentially carrying out microfiltration treatment and multistage disc-tube type reverse osmosis device treatment on the landfill leachate to obtain a concentrated solution and a permeate; wherein, multistage dish tubular reverse osmosis unit handles including: sequentially permeating the garbage percolate subjected to microfiltration treatment by a multi-stage disc-tube type reverse osmosis treatment unit to obtain a concentrated solution remained after permeation by a first-stage disc-tube type reverse osmosis treatment unit, concentrated water remained after permeation by a subsequent disc-tube type reverse osmosis treatment unit and a permeate; and the concentrated water flows back to a water inlet pipeline of the first-stage disc-tube reverse osmosis treatment unit for circular osmosis treatment;
evaporating the concentrated solution to obtain an evaporation mother solution and condensed water; wherein the evaporation temperature of the evaporation treatment is 17-40 ℃;
subjecting the condensed water to a circulation treatment, wherein the circulation treatment comprises: the condensed water is refluxed to the multistage disc tube type reverse osmosis device for osmosis treatment;
pretreating the evaporation mother liquor to obtain a solution to be treated, wherein the pretreatment comprises one or more of filtration treatment, feeding and mixing treatment and deamination treatment; the feeding and mixing treatment comprises the following steps: mixing part of the evaporation mother liquor with ammonium salt according to the mass ratio of 1: 0.2-0.5 to obtain the solution to be treated serving as a denitration agent;
performing final treatment on the liquid to be treated, wherein the final treatment comprises cement lime absorption curing treatment or cement kiln co-treatment; the cement kiln co-processing comprises the following steps: and spraying the solution to be treated serving as a denitration agent into a decomposition furnace in a cement kiln line for denitration.
2. The method for fully and quantitatively treating landfill leachate according to claim 1, wherein the pre-treating the evaporation mother liquor further comprises: mixing the evaporation mother liquor with sulfate reducing bacteria, guiding the mixture to a culture chamber for reaction for 24-48h, separating heavy metal precipitate generated after the reaction in a standing mode, and guiding the evaporation mother liquor separated from the heavy metal precipitate to the pretreatment part.
3. The method for the full-scale treatment of landfill leachate according to claim 1, wherein the multistage disc-tube reverse osmosis unit treatment is a two-stage disc-tube reverse osmosis unit treatment, and the two-stage disc-tube reverse osmosis unit treatment comprises:
conveying the landfill leachate after the microfiltration treatment to the first-stage disc-tube reverse osmosis treatment unit for treatment to obtain a concentrated solution and a first-stage permeate;
conveying the first-stage permeate to the second-stage disc-tube type reverse osmosis treatment unit for treatment to obtain permeate and concentrated water;
and returning the concentrated water to a water inlet pipeline of the first-stage disc-tube reverse osmosis treatment unit for circular osmosis treatment.
4. The method for the full-scale treatment of the landfill leachate according to claim 3, wherein the operating pressure of the first-stage disc-tube reverse osmosis treatment unit is 0-90 bar, and the operating pressure of the second-stage disc-tube reverse osmosis treatment unit is 0-70 bar.
5. The method for the full-scale treatment of landfill leachate according to claim 1, wherein the feeding and mixing treatment further comprises: mixing part of the evaporation mother liquor with water according to the ratio of 0.5-1: 1 to obtain the liquid to be treated serving as a mixed liquid; the cement kiln co-processing further comprises: and spraying the solution to be treated serving as the mixed solution into a waste incinerator of a cement kiln line.
6. The method for the full-scale treatment of landfill leachate according to claim 5, wherein the feeding and mixing treatment further comprises: mixing part of the evaporation mother liquor with lime powder according to the mass ratio of 1: 0.5-0.7 to obtain the liquid to be treated serving as mixed slurry; the cement kiln co-processing further comprises: and spraying the solution to be treated serving as the mixed slurry into a decomposing furnace in a cement kiln line for desulfurization.
7. The method for the full-scale treatment of landfill leachate according to any one of claims 1 to 6, wherein the pretreatment is the feed mixing treatment or the filtering treatment, the deamination treatment and the feed mixing treatment sequentially; and the final treatment is the cement kiln cooperative treatment.
8. The method for the full-scale treatment of landfill leachate according to claim 1, wherein the pretreatment comprises filtering and deamination in sequence;
wherein the filtering process comprises: sequentially filtering the evaporation mother liquor in a secondary filtering device with gradually increased filtering precision to ensure that SS of the evaporation mother liquor is less than 5 mg/L;
the deamination treatment comprises the following steps: conveying the evaporation mother liquor after filtration treatment to a cartridge filter to obtain a solution to be deaminated; adjusting the pH value of the liquid to be deaminated to be more than 10.5 by adding alkali, so that ammonium salt in the liquid to be deaminated is converted into ammonia gas; and conveying the liquid to be deaminated after the alkali is added and the adjustment to a tertiary deamination membrane with concentrated sulfuric acid for deamination to obtain the liquid to be treated and ammonium sulfate.
9. The method for the total quantitative treatment of landfill leachate according to claim 8, wherein the final treatment is the absorption and solidification treatment of cement lime, and the solidification treatment comprises:
mixing and stirring the liquid to be treated and a curing agent, and then conveying the mixture to a curing model for curing, wherein the curing agent comprises cement and lime;
and conveying the solidified liquid to be treated to a landfill site for landfill.
10. The method for fully and quantitatively treating the landfill leachate according to claim 9, wherein the mass ratio of the curing agent to the liquid to be treated is 0.2-0.5: 1; the stirring and mixing time is 5-10 min; the curing time was 2 d.
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