CN110963635A - Comprehensive treatment method of landfill leachate nanofiltration membrane trapped concentrated solution - Google Patents

Comprehensive treatment method of landfill leachate nanofiltration membrane trapped concentrated solution Download PDF

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CN110963635A
CN110963635A CN201811158677.2A CN201811158677A CN110963635A CN 110963635 A CN110963635 A CN 110963635A CN 201811158677 A CN201811158677 A CN 201811158677A CN 110963635 A CN110963635 A CN 110963635A
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treatment
aeration
wastewater
concentrated solution
oxidation
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安立超
陶正
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Nanjing University of Science and Technology
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Nanjing University of Science and Technology
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    • C02F1/722—Oxidation by peroxides
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Abstract

The invention discloses a comprehensive treatment method of a nanofiltration membrane trapped concentrated solution of landfill leachate. The treatment method comprises three-dimensional electrocatalytic oxidation, aeration, SBR biochemical treatment, deep oxidation treatment and secondary biochemical treatment processes, wherein the three-dimensional electrocatalytic oxidation firstly carries out ring-opening and bond-breaking decomposition on complex organic matters in nanofiltration concentrated solution, converts a part of macromolecular organic matters into micromolecular organic matters, adopts a DSA electrode as an anode and adopts supported columnar activated carbon as a particle electrode; then carrying out aeration treatment to remove effective chlorine generated by electrolysis and existing in the wastewater so as to avoid the influence of the effective chlorine on the subsequent treatment effect due to the killing of microorganisms; then SBR biochemical treatment is carried out, and pollutants in the wastewater are further converted; then carrying out deep oxidation treatment on the wastewater to strongly remove organic matters which are difficult to degrade in the wastewater; and finally, performing secondary biochemical treatment to remove most of residual pollutants in the wastewater, wherein the effluent reaches the standard. The invention effectively treats the nanofiltration membrane trapped concentrated solution of the landfill leachate and provides a new treatment idea.

Description

Comprehensive treatment method of landfill leachate nanofiltration membrane trapped concentrated solution
Technical Field
The invention discloses a comprehensive treatment method for effectively treating a nanofiltration membrane trapped concentrate of landfill leachate, belonging to the technical field of water treatment.
Background
Because the existing treatment process of the landfill leachate in China mainly applies membrane technologies such as ultrafiltration, nanofiltration and reverse osmosis, under the technical conditions, 13-30% of concentrated solution is generated by treating the landfill leachate. The high COD concentration and low biodegradability of the landfill leachate concentrate make it a potential pollution source with extremely strong destruction to the environment.
At present, the treatment method of the concentrated solution in the landfill leachate treatment process at home and abroad mainly comprises the following steps: the recharging is one of the percolate concentrated solution treatment methods widely applied in China at present, and the monitoring finds that after the concentrated solution is recharged, percolate COD and NH3N is elevated and conductivity rises sharply within a few months, which directly affects the treatment efficiency of the reverse osmosis system and, more importantly, may contaminate groundwater supplies; common reduction techniques can be divided into membrane and evaporation techniques, but the high concentrations of humic and fulvic acids in the concentrate lead to irreversible membrane fouling and, in addition, to the formation of humic substances, inorganic ions and Cl-The caused scaling and corrosion phenomena are factors which mainly restrict the application of the membrane technology and the evaporation technology in the treatment of the percolate concentrated solution at present; coagulating sedimentation and evaporation drying, wherein the coagulating sedimentation is easy to generate secondary pollution, the effluent is not easy to reach the standard, the evaporation drying has high requirements on equipment, the operating cost is high, and the operation is not easy.
The processes are difficult to realize stable and efficient treatment and standard discharge of the percolate membrane trapped concentrated solution by depending on a single technology, and the proper treatment of the landfill percolate membrane trapped concentrated solution is realized by combining a plurality of process methods on the basis of the prior art.
Disclosure of Invention
The invention aims to provide a comprehensive treatment method of landfill leachate nanofiltration membrane trapped concentrated solution, which skillfully combines an electrochemical method, a deep oxidation technology and a biochemical method to comprehensively treat the nanofiltration membrane trapped concentrated solution, and has the advantages of stable and effective operation and easy operation and maintenance.
The invention is realized by adopting the following technical scheme: a comprehensive treatment method of a nanofiltration membrane trapped concentrate of landfill leachate comprises the following steps:
s1, carrying out three-dimensional electrocatalytic oxidation treatment on the nanofiltration membrane trapped concentrated solution of the landfill leachate, controlling current density, and continuously electrolyzing for a period of time;
s2, adjusting the pH value of the electrolyzed wastewater to 5.5-6.0, then aerating, adding a small amount of sodium sulfite in the treatment process so as to remove effective chlorine in the wastewater, and continuously aerating for a period of time;
s3, adjusting the pH value of the wastewater subjected to aeration and dechlorination to 6-7, and performing SBR biochemical treatment;
s4, directly carrying out deep oxidation treatment on the supernatant generated in the step S3;
s5, the effluent of the step S4 is subjected to secondary biochemical treatment.
Further, the three-dimensional electrocatalytic oxidation treatment is carried out, wherein a DSA electrode plate is selected as an anode, a stainless steel electrode plate is selected as a cathode, supported columnar activated carbon is selected as a particle electrode, the distance between a cathode plate and an anode plate is controlled to be 80-120 mm, and the applied current density is 100-300A/m2The filling proportion of the particle electrode is 70-80%, and the aeration amount is 3-5 m3/（m2H), continuously electrolyzing for 120-180 min.
Further, in the aeration treatment, the electrolyzed wastewater is subjected to pH adjustment to weak acidity (5.5-6.0), and a small amount of sodium sulfite (0.05-0.10 kg/m) is added according to the content of residual effective chlorine in the wastewater3) And continuously aerating for 60-120 min.
Further, performing primary biochemical (SBR) treatment, adjusting the pH value to be about neutral (6-7), feeding water for 1-2 hours, performing aeration reaction for 4-6 hours, performing static sedimentation for 0.5-1.5 hours, draining water for 0.5-1.5 hours, and controlling one period to be 6-10 hours; the aeration mode adopts a high-strength surface aerator for aeration; the drainage mode selects one of a telescopic floating drainage port, a multilayer drainage pipe and a submersible sewage pump for drainage according to actual conditions.
Further, the deep oxidation treatment is performed by wet oxidation method or O3/H2O2One or more of an oxidation method, a Fenton oxidation method and a photochemical oxidation method.
Further, the second-stage biochemical treatment is an A/O process2One of/O process, AB (adsorption-biodegradation) process and aeration biological filter processOr several, single-stage or multi-stage series connection.
Compared with the prior art, the invention has the following advantages:
aiming at the problem that a nanofiltration membrane interception concentrated solution which is difficult to treat and is generated in the existing common multistage membrane method garbage leachate treatment process, firstly, a three-dimensional electrocatalysis method is adopted to carry out ring-opening and bond-breaking decomposition on organic matters in the nanofiltration concentrated solution; secondly, removing active chlorine in the water by methods of acid regulation, aeration and reducing agent addition; then, a Sequencing Batch Reactor (SBR) with strong adaptability to water quantity and water quality change is adopted as primary biochemical treatment, biochemical organic matters in water are primarily decomposed, and the forms of partial organic matters which are difficult to biodegrade are converted; then, an advanced oxidation treatment process is selected to further change the organic matters in the nanofiltration concentrated solution into micromolecular organic matters and carbonize the micromolecular organic matters, and the biochemical treatment can be carried out; and finally removing most of residual pollutants in the wastewater through an aerobic biochemical process.
Drawings
FIG. 1 is a process flow diagram of the comprehensive treatment method of the nanofiltration membrane trapped concentrate of landfill leachate.
Detailed Description
The invention will now be further described with reference to the accompanying drawings and examples.
With reference to fig. 1, the comprehensive treatment method of the nanofiltration membrane trapped concentrate of landfill leachate comprises the following steps:
and S1, performing three-dimensional electrocatalytic oxidation treatment on the nanofiltration membrane trapped concentrated solution of the landfill leachate, controlling the current density, and continuously electrolyzing for a period of time. Can oxidize and decompose a large amount of macromolecular soluble organic matters which are difficult to be biologically degraded in the nanofiltration concentrated solution of the landfill leachate, reduce the content of ammonia nitrogen to a certain extent and improve the Biodegradability (BOD) of the wastewater to a certain extent5/CODcr) 0.05-0.10, providing reaction conditions for subsequent biochemical treatment;
and S2, adjusting the pH value of the electrolyzed wastewater to 5.5-6.0, then aerating, adding a small amount of sodium sulfite in the treatment process so as to remove effective chlorine in the wastewater, and continuously aerating for a period of time. The purpose is to remove the available chlorine in the wastewater so as to avoid the effect that the available chlorine kills microorganisms to influence the subsequent biochemical treatment effect;
s3, adjusting the pH value of the wastewater subjected to aeration dechlorination to 6-7, performing SBR biochemical treatment, preliminarily decomposing biochemical organic matters in the wastewater, and converting the forms of partial organic matters difficult to biodegrade;
s4, directly carrying out deep oxidation treatment on the supernatant generated in the step S3 to further remove organic matters which are difficult to biodegrade in water;
s5, performing secondary biochemical treatment on the effluent water obtained in the step S4 to remove most of the residual pollutants in the water.
The landfill leachate nanofiltration concentrated solution treated by the steps can be discharged after reaching the standard.
Example 1:
the MBR and NF method is adopted in a certain refuse landfill to treat the landfill leachate to generate nanofiltration concentrated solution, wherein the COD of the nanofiltration concentrated solution is about 2000mg/L, the TDS of the nanofiltration concentrated solution is about 12000mg/L, and the NH of the nanofiltration concentrated solution is3-N is about 60 mg/L. The landfill leachate nanofiltration concentrated solution is treated by the comprehensive treatment method, the waste water is subjected to three-dimensional electrocatalytic oxidation treatment, and the current density is controlled to be 300A/m2The spacing between the anode and the cathode is 120mm, the filling proportion of the particle electrode is 80 percent, and the aeration quantity is 3m3/（m2H), continuously electrolyzing for 150min, and reducing COD (chemical oxygen demand) of the electrolyzed wastewater to 1000-1200 mg/L and NH3N is reduced to 20-30 mg/L, and the available chlorine in the solution is about 1000 mg/L; the wastewater after electrolysis enters an aeration tank, sulfuric acid is added to adjust the pH value to 5.5, the wastewater is kept stand for 2 hours after continuous aeration for 90min, and the concentration is 0.05kg/m3Adding a reducing agent sodium sulfite, and stirring to obtain about 0mg/L of available chlorine in the wastewater; after aeration, the wastewater enters an SBR reaction tank, alkali is added to adjust the pH value to be neutral, water is fed for 1h, the reaction is carried out for 4h, standing and settling are carried out for 40min, water is discharged for 1h, one operation period is about 7h, the water quality COD of SBR effluent is about 800mg/L, NH is added3-N is about 10-20 mg/L; the SBR effluent enters an ozone oxidation reaction tank, and the effluent quality COD is about 300 mg/L; finally, the effluent enters an aeration biological filter, the COD of the effluent quality is reduced to 100mg/L, NH3The content of N is less than or equal to 10mg/L, and the other indexes of TP is less than or equal to 3mg/L, which all reach the standard of the pollution control standard of domestic garbage landfill (GB 16889-2008) in Table 2.
Example 2:
nanofiltration concentrate produced by certain refuse landfillThe water quality index of the condensed liquid is as follows: COD about 1500mg/L, TDS about 10000mg/L, NH3-N is about 50 mg/L. The landfill leachate nanofiltration concentrated solution is treated by the comprehensive treatment method, the waste water is subjected to three-dimensional electrocatalytic oxidation treatment, and the current density is controlled to be 200A/m2The distance between the anode and the cathode is 100mm, the filling proportion of the particle electrode is 80 percent, and the aeration quantity is 3m3/（m2H), continuously electrolyzing for 120min, and reducing COD (chemical oxygen demand) of the electrolyzed wastewater to 600-800 mg/L and NH3N is reduced to about 20mg/L, and the available chlorine in the solution is about 800 mg/L; the wastewater after electrolysis enters an aeration tank, sulfuric acid is added to adjust the pH value to 5.5, the wastewater is kept stand for 2 hours after continuous aeration for 60min, and the concentration is 0.05kg/m3Adding a reducing agent sodium sulfite, and stirring to obtain about 0mg/L of available chlorine in the wastewater; after aeration, the wastewater enters an SBR reaction tank, alkali is added to adjust the pH value to be neutral, water is fed for 1h, the reaction is carried out for 4h, static sedimentation is carried out for 0.5h, water drainage is carried out for 0.5h, one operation period is 6h, the water quality COD of SBR effluent is = 400-500 mg/L, and NH is added3-N < 20 mg/L; the SBR effluent enters a Fenton oxidation reaction tank, and the effluent quality is COD<200 mg/L; finally enter into A2The COD of the effluent water quality of the/O biochemical reaction tank is reduced to 100mg/L and NH3The content of N is less than or equal to 10mg/L, and the other indexes of TP is less than or equal to 3mg/L, which all reach the standard of the pollution control standard of domestic garbage landfill (GB 16889-2008) in Table 2.

Claims (6)

1. A comprehensive treatment method of a nanofiltration membrane trapped concentrate of landfill leachate is characterized by comprising the following steps:
s1, carrying out three-dimensional electrocatalytic oxidation treatment on the nanofiltration membrane trapped concentrated solution of the landfill leachate, controlling current density, and continuously electrolyzing for a period of time;
s2, adjusting the pH value of the electrolyzed wastewater to 5.5-6.0, then carrying out aeration treatment, adding sodium sulfite to remove effective chlorine in the wastewater in the treatment process, and continuously aerating for a period of time;
s3, adjusting the pH value of the wastewater subjected to aeration and dechlorination to 6-7, and performing SBR biochemical treatment;
s4, directly carrying out deep oxidation treatment on the supernatant generated in the step S3;
s5, the effluent of the step S4 is subjected to secondary biochemical treatment.
2. The method of claim 1, wherein in step S1, the three-dimensional electrocatalytic oxidation treatment is performed by selecting DSA electrode plate as anode, stainless steel electrode plate as cathode, supported columnar activated carbon as particle electrode, controlling the distance between cathode and anode plates to 80-120 mm, and applying current density to 100-300A/m2The filling proportion of the particle electrode is 70-80%, and the aeration amount is 3-5 m3/（m2H), continuously electrolyzing for 120-180 min.
3. The method according to claim 1, wherein the aeration treatment is performed in step S2 by adding 0.05 to 0.10kg/m3The sodium sulfite is used for removing effective chlorine in the wastewater, and aeration is continuously carried out for 60-120 min.
4. The method according to claim 1, wherein in step S3, the SBR biochemical treatment comprises feeding water for 1-2 h, performing aeration reaction for 4-6 h, performing static sedimentation for 0.5-1.5 h, draining water for 0.5-1.5 h, and controlling a period for 6-10 h; the aeration mode adopts a high-strength surface aerator for aeration; the drainage mode is one of a telescopic floating drainage port, a multilayer drainage pipe and a submersible sewage pump.
5. The method of claim 1, wherein in step S4, the deep oxidation treatment is wet oxidation or O3/H2O2One or more of an oxidation method, a Fenton oxidation method and a photochemical oxidation method.
6. The method of claim 1, wherein in step S5, the secondary biochemical treatment is selected from A/O process, A2One or more of an O process, an adsorption-biodegradation process and an aeration biological filter process.
CN201811158677.2A 2018-09-30 2018-09-30 Comprehensive treatment method of landfill leachate nanofiltration membrane trapped concentrated solution Pending CN110963635A (en)

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN113493238A (en) * 2021-07-15 2021-10-12 浙江大学 Method for treating landfill leachate biochemical tail water by using three-dimensional electrode and persulfate advanced oxidation technology
CN113636725A (en) * 2021-08-27 2021-11-12 中化环境科技工程有限公司 Method for treating PTA wastewater RO concentrated water
CN115572012A (en) * 2022-10-21 2023-01-06 广西博世科环保科技股份有限公司 Treatment equipment and method for full-scale treatment of landfill leachate

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