CN112794583A - Method for treating landfill leachate by using rhodobacter - Google Patents

Method for treating landfill leachate by using rhodobacter Download PDF

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Publication number
CN112794583A
CN112794583A CN202110128906.1A CN202110128906A CN112794583A CN 112794583 A CN112794583 A CN 112794583A CN 202110128906 A CN202110128906 A CN 202110128906A CN 112794583 A CN112794583 A CN 112794583A
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China
Prior art keywords
penetrating fluid
garbage penetrating
treatment
rhodobacter
landfill leachate
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Pending
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CN202110128906.1A
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Chinese (zh)
Inventor
周蕾
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Zhejiang Free Trade Zone Yiqian Environmental Protection Technology Studio
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Zhejiang Free Trade Zone Yiqian Environmental Protection Technology Studio
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/44Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/44Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/442Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/44Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/28Anaerobic digestion processes
    • C02F3/2813Anaerobic digestion processes using anaerobic contact processes
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents

Abstract

The invention relates to the technical field of sewage treatment, in particular to a method for treating landfill leachate by using rhodobacter, which comprises the following steps: s1) the garbage penetrating fluid enters a treatment system; s2) pretreating the garbage penetrating fluid by a pretreatment device; s3) degrading ammonia nitrogen total nitrogen in the garbage penetrating fluid by the anaerobic ammonia oxidation reaction tank; s4) removing COD in the garbage penetrating fluid by the decarbonization tank; s5) filtering the garbage penetrating fluid by an ultrafiltration system; s6) softening the garbage penetrating fluid by the hardness removal system; s7) the nanofiltration system separates the garbage penetrating fluid; s8) reverse osmosis is carried out on the nanofiltration treatment liquid by the reverse osmosis system; s9) discharging the treatment liquid. The method firstly utilizes the carbon source in the garbage penetrating fluid to carry out degradation denitrification, and then enters the decarbonization tank to decarbonize and remove COD. Compared with the traditional treatment process, the treatment method does not need to add extra carbon source, and has simple process flow and low operation cost; the cloned rhodobacter has high tolerance concentration, high load and stable processing system.

Description

Method for treating landfill leachate by using rhodobacter
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a method for treating landfill leachate by using rhodobacter.
Background
The landfill leachate is typical high ammonia nitrogen wastewater, the concentration of organic matters in the leachate is gradually reduced along with the extension of landfill time, the concentration of ammonia nitrogen and total nitrogen is increased or not reduced, the leachate is converted into low-C/N high ammonia nitrogen wastewater, the concentration of ammonia nitrogen can reach 3000mg/L, and the concentration of biochemical COD can be as low as 2500 mg/L.
Therefore, the denitrification process for the landfill leachate (especially the late-stage leachate) has the following problems: a large amount of additional carbon sources (such as methanol, glucose and the like) are needed to realize denitrification, and the adding amount can reach 10kg of methanol/m ^3 percolate; the aeration energy consumption is high, and the sludge yield is high; the nitrifying bacteria are easy to die and inactivate because the nitrifying bacteria cannot tolerate high-concentration ammonia nitrogen, so that the system is collapsed. The problems directly cause the operation cost of the treatment system to be high and the standard discharge to be difficult.
Disclosure of Invention
In order to solve the defects of the prior art, the invention discloses a method for treating landfill leachate by using rhodobacter.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for treating landfill leachate by using rhodobacter comprises the following steps:
s1) the garbage penetrating fluid enters a treatment system;
s2) pretreating the garbage penetrating fluid by the pretreatment device;
s3) degrading ammonia nitrogen total nitrogen in the garbage penetrating fluid by the anaerobic ammonia oxidation reaction tank;
s4) removing COD in the garbage penetrating fluid by the decarbonization tank;
s5) filtering the garbage penetrating fluid by an ultrafiltration system;
s6) softening the garbage penetrating fluid by the hardness removal system;
s7) the nanofiltration system separates the garbage penetrating fluid to form nanofiltration treatment liquid and concentrated liquid;
s8) the reverse osmosis system carries out reverse osmosis on the nanofiltration treatment liquid to form a permeation treatment liquid and a concentrated liquid;
s9) discharging the treatment liquid.
Further, the method also comprises the following steps: s8.1) filtering the concentrated solution by using a DTRO membrane system to form a filtered treatment solution and a concentrated solution.
Further, the method also comprises the following steps: s10) discharging the filtration treatment liquid, and refilling the concentrated liquid to landfill.
Further, in step S3, the anammox reaction tank uses rhodobacter xylinum.
Further, in step S3, the anammox reaction tank is in an anaerobic environment, and the temperature of water in the tank is 30 ℃.
Further, in step S3, the ratio of the amount of rhodobacter usage to the waste leachate in the anammox reaction tank is 1: 10.
Compared with the prior art, the invention has the beneficial effects that:
1: because the denitrification process needs to consume a certain carbon source, the invention firstly utilizes the carbon source in the garbage penetrating fluid to carry out degradation denitrification, and then enters the decarbonization tank to decarbonize and remove COD. Compared with the traditional treatment process, the treatment method does not need additional carbon source, simplifies the process flow and has low operation cost.
2: the cloned rhodobacter can tolerate the concentration of 4600mg/L ammonia nitrogen, the treatment system is stable, and the stable degradation efficiency can be kept.
3: the anaerobic ammoxidation reaction tank does not need aeration, so the denitrification treatment cost is lower; moreover, nitrification and denitrification reflux are not needed, the load of rhodobacter is high, and the effect of degrading total nitrogen of ammonia nitrogen at the same time can be achieved.
Drawings
FIG. 1 is a schematic diagram of the steps of the method of the present invention.
FIG. 2 is a table of experimental data for the present invention.
FIG. 3 is a graph of experimental data rates according to the present invention.
FIG. 4 is an experimental diagram of the present invention.
Detailed Description
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. The invention will now be further described with reference to the accompanying description and examples:
a penetrating fluid sewage treatment system comprises a pretreatment device, an anaerobic ammonia oxidation reaction tank, a decarburization tank, an ultrafiltration system, a hardness removal system, a nanofiltration system, a reverse osmosis system and a DTRO (draw texturing yarn reverse osmosis) membrane system. The sewage treatment system adopts a method for treating the landfill leachate by using rhodobacter to discharge and treat the landfill leachate. The processing method comprises the following steps:
s1) the garbage penetrating fluid enters a treatment system;
s2) pretreating the garbage penetrating fluid by the pretreatment device;
s3) degrading ammonia nitrogen total nitrogen in the garbage penetrating fluid by the anaerobic ammonia oxidation reaction tank;
s4) removing COD in the garbage penetrating fluid by the decarbonization tank;
s5) filtering the garbage penetrating fluid by an ultrafiltration system;
s6) softening the garbage penetrating fluid by the hardness removal system;
s7) the nanofiltration system separates the garbage penetrating fluid to form nanofiltration treatment liquid and concentrated liquid;
s8) the reverse osmosis system carries out reverse osmosis on the nanofiltration treatment liquid to form a permeation treatment liquid and a concentrated liquid;
s8.1) filtering the concentrated solution by using a DTRO membrane system to form a filtering treatment solution and a concentrated solution;
s9) discharging the treatment liquid;
s10) discharging the filtration treatment liquid, and refilling the concentrated liquid to landfill.
In the treatment method, the anaerobic ammonia oxidation reaction tank is in an anaerobic environment, and rhodobacter is put into the anaerobic ammonia oxidation reaction tank and is used for denitrifying garbage penetrating fluid. The rhodobacter is commonly known in the industry as Anammox, and is a type of bacterium belonging to the phylum pumila, and the Anammox can oxidize ammonia into nitrogen by taking ammonia as an electron donor and nitrate or nitrite as an electron acceptor under anaerobic conditions.
In the treatment method, the water temperature in the anaerobic ammonia oxidation reaction tank is kept at 30 ℃, and the ratio of the usage amount of the rhodobacter and the garbage penetrating fluid in the anaerobic ammonia oxidation reaction tank is 1: 10.
In the treatment method, the decarbonization tank is used for decarbonizing and removing COD. The decarbonization tank adopts a coagulation method, organic pollutants and suspended matters in the water body are destabilized, mutually collided and condensed to form flocculating constituents by adding a flocculating agent into the penetrating fluid and utilizing the adsorption bridging, double electric layers compression and net catching functions of the flocculating agent, and then particles are separated from the water by using a precipitation or air floatation process to achieve the effect of removing COD.
In the treatment method, the ultrafiltration system is used for filtering colloids, bacteria and impurities. The ultrafiltration system is a filter device which takes an ultrafiltration membrane as a filter element. The ultrafiltration membrane belongs to a capillary hollow fiber membrane, is an asymmetric semipermeable membrane produced by a special membrane manufacturing process by using a high polymer material, is made of modified PVC, PAN or PVDF, and has good mechanical property, heat resistance, chemical resistance and strong pollution resistance. The ultrafiltration membrane belongs to internal pressure type filtration, namely garbage penetrating fluid firstly enters the hollow membrane filaments, and permeates through the hollow membrane filaments from inside to outside along the radial direction through the driving of pressure difference, thereby filtering various macromolecular substances such as bacteria, colloid, impurities and the like in the garbage penetrating fluid.
In the treatment process, the hardness removal system is used to soften the waste permeate. The hardness removal system is a filtering device taking resin as a filter element, and the resin can adsorb scaling ions in garbage penetrating fluid, such as Ca2+, Mg2+ and the like, so that the garbage penetrating fluid is softened, and the fouling and scaling tendency of a membrane filtering unit in a subsequent filtering system is effectively reduced.
In the treatment method, the nanofiltration system is used for concentrating and separating macromolecular substances in the solution. Because the nanofiltration system adopts the nanofiltration membrane with the aperture of 1-2nm, the aperture is between the ultrafiltration and the reverse osmosis, under the action of the pressure difference driving force, salt and small molecular substances penetrate through the nanofiltration membrane to form nanofiltration treatment liquid; and the trapped macromolecular substances are separated to form a concentrated solution.
In the treatment method, the reverse osmosis system is used for filtering and purifying nanofiltration treatment liquid. The reverse osmosis system is a reverse osmosis membrane which is pressurized by a hydraulic pump and has the pore diameter of 1/10000 mu m, so that pollutants, bacteria, impurities and water in the nanofiltration treatment liquid are isolated to form pure permeation treatment liquid and concentrated liquid.
In this treatment process, the DTRO membrane system is used to further separate a pure filtered treatment solution and a concentrated solution. The DTRO membrane system (disc tube type reverse osmosis membrane) is a form of reverse osmosis, is a membrane module specially used for treating high-concentration sewage, and the core technology of the DTRO membrane system is a disc tube type membrane column. The reverse osmosis membrane and the hydraulic guide plate are stacked together, fixed by a central pull rod and an end plate and then placed into a pressure-resistant sleeve to form a membrane column. The unique structure of the DTRO membrane column enables the DTRO membrane column to achieve low-degree scaling and pollution phenomena in landfill leachate treatment, the service life is long, and the assembly is easy to maintain.
The first embodiment is as follows: denitrification experiments and methods
The test instrument: beaker (as in figure 4)
Experimental materials: 500ml landfill leachate +50ml rhodobacter
The experimental conditions are as follows: the test temperature is 30 ℃, and the aeration is not carried out after standing
Reaction time: 96h
Experiment stability: repeat two sets of tests
Experimental accuracy: the ammonia nitrogen concentration of the two times is reduced to below 5mg/L
The experimental results are as follows: denitrification experiment one group of experimental data is shown in figure 2
Time 0h 4h 16h 28h 40h 42h 48h 64h 72h
Ammonia nitrogen concentration (mg/L) 1800 1700 1500 1240 925 769 559 224 0
FIG. 2
The data table of the experiment in FIG. 2 and the degradation rate chart in FIG. 3 can be combined to obtain:
1: the rhodobacter xylinum treatment efficiency can be stably degraded by 500mg/L (0.5 kg/m/d) every day, and when the reaction time reaches 96h, the ammonia nitrogen is reduced to be not detected.
2: the ammonia nitrogen degradation efficiency of the rhodobacter is the maximum in the period of 40-42 h, and the ammonia nitrogen concentration is degraded to 0mg/L in 72 h.
3: the rhodobacter has stable degradation capability on the ammonia nitrogen of the landfill leachate, and is suitable for independently adding quantitative rhodobacter in an anoxic tank or an anaerobic tank section.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; these modifications and substitutions do not cause the essence of the corresponding technical solution to depart from the scope of the technical solution of the embodiments of the present invention, and are intended to be covered by the claims and the specification of the present invention.

Claims (6)

1. A method for treating landfill leachate by using rhodobacter is characterized by comprising the following steps:
s1) the garbage penetrating fluid enters a treatment system;
s2) pretreating the garbage penetrating fluid by the pretreatment device;
s3) degrading ammonia nitrogen total nitrogen in the garbage penetrating fluid by the anaerobic ammonia oxidation reaction tank;
s4) removing COD in the garbage penetrating fluid by the decarbonization tank;
s5) filtering the garbage penetrating fluid by an ultrafiltration system;
s6) softening the garbage penetrating fluid by the hardness removal system;
s7) the nanofiltration system separates the garbage penetrating fluid to form nanofiltration treatment liquid and concentrated liquid;
s8) the reverse osmosis system carries out reverse osmosis on the nanofiltration treatment liquid to form a permeation treatment liquid and a concentrated liquid;
s9) discharging the treatment liquid.
2. The method for treating landfill leachate according to claim 1, further comprising the step of: s8.1) filtering the concentrated solution by using a DTRO membrane system to form a filtered treatment solution and a concentrated solution.
3. The method for red fungus treatment of landfill leachate according to claim 2, further comprising the steps of: s10) discharging the filtration treatment liquid, and refilling the concentrated liquid to landfill.
4. The method for treating landfill leachate according to claim 1, wherein the method comprises the following steps: in step S3, rhodobacter xylinum is used in the anammox reaction tank.
5. The method for treating landfill leachate according to claim 1, wherein the method comprises the following steps: in step S3, the anammox reaction tank is in an anaerobic environment, and the water temperature in the tank is 30 ℃.
6. The method for treating landfill leachate according to claim 1, wherein the method comprises the following steps: in step S3, the ratio of the amount of rhodobacter used to the waste leachate in the anammox reaction tank is 1: 10.
CN202110128906.1A 2021-01-30 2021-01-30 Method for treating landfill leachate by using rhodobacter Pending CN112794583A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101148307A (en) * 2007-08-28 2008-03-26 北京盖雅环境科技有限公司 Anaerobic-aerobic-film processing technique for urban domestic refuse percolate
CN101891336A (en) * 2010-06-25 2010-11-24 北京伊普国际水务有限公司 System and method for leachate treatment in sanitary landfill
CN110422962A (en) * 2019-08-08 2019-11-08 南京环美科技股份有限公司 A kind of processing unit for incineration plant landfill leachate qualified discharge
CN110563261A (en) * 2019-09-09 2019-12-13 贵州欧瑞欣合环保股份有限公司 landfill leachate biological treatment method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101148307A (en) * 2007-08-28 2008-03-26 北京盖雅环境科技有限公司 Anaerobic-aerobic-film processing technique for urban domestic refuse percolate
CN101891336A (en) * 2010-06-25 2010-11-24 北京伊普国际水务有限公司 System and method for leachate treatment in sanitary landfill
CN110422962A (en) * 2019-08-08 2019-11-08 南京环美科技股份有限公司 A kind of processing unit for incineration plant landfill leachate qualified discharge
CN110563261A (en) * 2019-09-09 2019-12-13 贵州欧瑞欣合环保股份有限公司 landfill leachate biological treatment method

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Title
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