CN111039463A - Method for treating landfill leachate MBR effluent by Fenton process - Google Patents
Method for treating landfill leachate MBR effluent by Fenton process Download PDFInfo
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- CN111039463A CN111039463A CN201911400069.2A CN201911400069A CN111039463A CN 111039463 A CN111039463 A CN 111039463A CN 201911400069 A CN201911400069 A CN 201911400069A CN 111039463 A CN111039463 A CN 111039463A
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- effluent
- landfill leachate
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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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- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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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
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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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
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
Abstract
The invention discloses a Fenton process MBR effluent treatment method for landfill leachate, which comprises the following steps: step 1: adding alkaline liquor to adjust the pH value of the effluent of the landfill leachate MBR; step 2: adding a ferrous reagent into the effluent water obtained in the step 1; and step 3: adding hydrogen peroxide into the effluent obtained in the step 2; and 4, step 4: adding alkali liquor into the effluent water obtained in the step 3 to control the pH value of the effluent water to be in a constant range, wherein the reaction time is T1; and 5: and (4) taking the effluent in the step (4), continuing to react for time T2, adding liquid alkali to a constant pH value, and flocculating. The invention treats the MBR effluent of the landfill leachate, the COD removal rate can reach more than 80 percent, the process flow is simple and easy to operate, no concentrated solution is generated, the medicament is saved, and the invention has good popularization prospect.
Description
Technical Field
The invention belongs to the technical field of landfill leachate treatment, and particularly relates to a method for treating MBR (membrane bioreactor) effluent of landfill leachate by a Fenton process.
Background
At present, the treatment mode of domestic garbage in China is mainly sanitary landfill, in the landfill process, due to the shower of rainwater and the mixing of liquid generated by garbage fermentation with surface water and underground water, garbage leachate with high-concentration organic matters, nitrogen and phosphorus, various heavy metal ions, bacteria, viruses and other complex components is formed, and if the garbage leachate cannot be properly treated, the surrounding environment is seriously polluted, the surrounding surface water and the underground water are seriously polluted, and the living environment of human beings is seriously threatened. At present, landfill leachate is mainly treated by physicochemical, biochemical and membrane filtration processes in China, so that concentrated solution with complex components and high concentration and difficult degradation treatment is generated, and a reasonable and effective treatment method of the membrane concentrated solution is still a problem in the industry.
The Fenton advanced oxidation technology is used for generating hydroxyl radicals with strong oxidizing property to oxidize organic matters in wastewater, and the Fenton reaction is generally carried out by adding hydrogen peroxide and a ferrous iron reagent. Because of the strong oxidizing property of the hydroxyl free radical, the hydroxyl free radical can be used for rapidly oxidizing pollutants in water without selectivity, has the advantages of high efficiency and rapid reaction, and simultaneously has no concentrated solution compared with the membrane technology, and can realize the high-efficiency treatment of the percolate. How to use the Fenton process for advanced treatment of landfill leachate MBR effluent is less researched, so that the method has important significance.
The invention patent application with publication number CN109293161A provides a landfill leachate MBR effluent treatment process, which comprises the following steps: step 1: coagulating, namely taking MBR effluent of the landfill leachate to adjust PH, and adding a medicament for coagulating sedimentation; step 2: a first-stage Fenton-like oxidation process, namely taking the effluent obtained in the step 1 to adjust the pH value, and adding a Fenton-like catalyst and hydrogen peroxide; and step 3: a primary BAC process, wherein the effluent obtained in the step (2) is transferred into a BAC device and stays for 24-48 h; and 4, step 4: a secondary Fenton-like oxidation process, namely taking the effluent obtained in the step (3) and repeating the operation in the step (2); and 5: and (4) a secondary BAC process, wherein the effluent obtained in the step (4) is transferred into a BAC device and stays for 12-24 hours. The process has higher cost by adopting a secondary Fenton-like oxidation process.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a Fenton process capable of efficiently treating the effluent of the landfill leachate MBR, wherein the effluent of the MBR is subjected to primary alkali adjustment, hydrogen peroxide and ferrous iron reagents are added, the pH of a system is controlled, and finally the secondary alkali adjustment flocculation is combined with the Fenton process.
The technical scheme of the invention is that the method for treating the MBR effluent of the landfill leachate by the Fenton process comprises the following steps:
step 1: and (3) adjusting alkali for the first time, taking the effluent of the landfill leachate MBR, and adding alkali liquor to adjust the pH.
Step 2: adding a ferrous reagent, and adding a solid ferrous reagent or a ferrous sulfate solution into the effluent obtained in the step (1).
And step 3: adding hydrogen peroxide, and dropwise adding the hydrogen peroxide into the effluent obtained in the step (2) by adopting a pump.
And 4, step 4: controlling the pH value of the system, dropwise adding alkali liquor into the solution obtained in the step 3 by using a pump to control the pH value of the system to be in a constant range, and reacting for T1; the pH value of the whole system is controlled within a designed constant range by adding liquid, so that the efficient oxidation of the Fenton reaction is facilitated.
And 5: and (4) adjusting alkali for the second time, taking the effluent obtained in the step (4), continuing to react for time T2, adding liquid alkali until the pH is constant, flocculating, and performing PAM (polyacrylamide) coagulation-assisting precipitation. The step is to continue the oxidation reaction under the optimal conditions obtained from the step 1-4, and then adjust the pH to a proper pH value with the alkali liquor for flocculation, so that partial pollutants can be removed again through flocculation.
Wherein in the step 1, the pH is adjusted to 8.0-9.5.
Wherein, in the step 1 and the step 4, the added alkali liquor is liquid alkali or sodium carbonate or a mixed solution of the liquid alkali and the sodium carbonate.
In the step 2 and the step 3, the mass ratio of the hydrogen peroxide to the wastewater COD is (2.0-2.5):1, and the molar ratio of the ferrous ions to the hydrogen peroxide is (0.8-1.2): 1.
Wherein in the step 4, the pH value of the system is controlled to be constant at 2.8-3.0.
In the steps 4 and 5, T1 is 30min, and T2 is 90 min.
In the step 5, the pH value is controlled to be constant at 4.0-7.0 by adding liquid caustic soda for the second time.
Has the advantages that: compared with the prior art, the invention has the following characteristics:
(1) compared with the traditional Fenton process, the process has the advantages of high oxidation efficiency, stable COD (chemical oxygen demand) of the effluent and no color reversion phenomenon, the removal rate of the COD reaches more than 85 percent, and the COD of the effluent can be lower than 150 by using more sample water if the incoming water is ideal.
(2) Compared with the traditional Fenton process for pre-adjusting the pH value to 3.0-4.0, the process does not involve acid liquor for pre-adjusting the pH value, and can save acid liquor.
(3) Compared with the traditional Fenton process, the flocculation pH is 7.5-9.0, the process is adjusted back to 4.0-7.0, and alkali liquor can be saved.
(4) No concentrated solution is generated in the treatment process, and the problem that membrane concentrated solution is difficult to treat in the prior art is solved.
(5) Simple process, easy operation, low cost and good popularization prospect.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention discloses a Fenton process MBR effluent treatment method for landfill leachate, which comprises the following steps:
step 1: primary alkali adjustment, namely taking the effluent of the landfill leachate MBR, and adding alkali liquor (or adding no acid or alkali) to adjust the pH; 8.0-9.5. The added alkali liquor is liquid alkali or sodium carbonate or the mixture of the liquid alkali and the sodium carbonate.
Step 2: adding a ferrous reagent, and adding a solid ferrous reagent or a ferrous sulfate solution into the effluent obtained in the step (1);
and step 3: adding hydrogen peroxide, and dropwise adding the hydrogen peroxide into the effluent obtained in the step (2) by adopting a pump;
and 4, step 4: and (3) controlling the pH of the system, and dropwise adding alkali liquor into the step (3) by using a pump to control the pH of the system to be in a constant range, wherein the pH is constant at 2.8-3.0. Reaction time T1; the added alkali liquor is caustic soda, liquid alkali or sodium carbonate or the mixture of the caustic soda and the liquid alkali.
And 5: adjusting alkali for the second time, taking the effluent obtained in the step (4), continuing to react for time T2, adding liquid alkali until the pH is constant, flocculating, and precipitating by PAM (polyacrylamide) coagulation aid;
wherein, the mass ratio of the hydrogen peroxide to the wastewater COD in the step 2 and the step 3 is (2.0-2.5):1, and the molar ratio of the ferrous ions to the hydrogen peroxide is (0.8-1.2): 1.
In step 4 and step 5, T1 is 30min, and T2 is 90 min.
Wherein, in the step 5, acid liquor or liquid alkali is added for the second time to control the pH to be constant at 4.0-7.0.
In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.
Example 1
The Fenton treatment method for the landfill leachate MBR effluent with COD (chemical oxygen demand) of 1132mg/L comprises the following steps:
step 1: adjusting alkali for the first time, taking the effluent of the landfill leachate MBR, and adding liquid alkali to adjust the pH to 8.0;
step 2: adding a ferrous reagent, namely adding 22.21g/L of solid ferrous reagent (the molar ratio of ferrous ions to hydrogen peroxide is 1.2:1) into the effluent obtained in the step (1);
and step 3: adding hydrogen peroxide, and dropwise adding 7.55g/L hydrogen peroxide (the mass ratio of hydrogen peroxide to wastewater COD is 2.0:1) into the effluent obtained in the step (2) by using a pump;
and 4, step 4: controlling the pH of the system, dropwise adding alkali liquor into the step 3 by using a pump to control the pH of the system to be constant at 2.8, and reacting for 30 min;
and 5: and (4) adjusting alkali for the second time, taking the effluent obtained in the step (4), continuing to react for 90min, adding liquid alkali until the pH is constant to 4.0, and performing PAM (polyacrylamide) coagulation-aiding precipitation. The COD of the final effluent is 214.81mg/L, and the removal rate of the COD is 81.02%.
Example 2
The Fenton treatment method for the landfill leachate MBR effluent with COD (chemical oxygen demand) of 1132mg/L comprises the following steps:
step 1: adjusting alkali for the first time, taking the effluent of the landfill leachate MBR, and adding liquid alkali to adjust the pH to 9.5;
step 2: adding a ferrous reagent, namely adding 18.51g/L of solid ferrous reagent (the molar ratio of ferrous ions to hydrogen peroxide is 0.8:1) into the effluent obtained in the step (1);
and step 3: adding hydrogen peroxide, and dropwise adding 9.43g/L hydrogen peroxide (the mass ratio of hydrogen peroxide to wastewater COD is 2.5:1) into the effluent obtained in the step (2) by using a pump;
and 4, step 4: controlling the pH of the system, dropwise adding alkali liquor into the step 3 by using a pump to control the pH of the system to be constant at 3.0, and reacting for 30 min;
and 5: and (4) adjusting alkali for the second time, taking the effluent obtained in the step (4), continuing to react for 90min, adding liquid alkali until the constant pH value is 7.0, and performing PAM (Polyacrylamide) coagulation-aiding precipitation. The COD of the final effluent is 222.22mg/L, and the removal rate of the COD is 80.37 percent.
Example 3
The Fenton treatment method for the landfill leachate MBR effluent with COD (chemical oxygen demand) of 1132mg/L comprises the following steps:
step 1: adjusting alkali for the first time, taking the effluent of the landfill leachate MBR, and adding liquid alkali to adjust the pH to 8.5;
step 2: adding a ferrous reagent, namely adding 18.51g/L of solid ferrous reagent (the molar ratio of ferrous ions to hydrogen peroxide is 1:1) into the effluent obtained in the step (1);
and step 3: adding hydrogen peroxide, and dropwise adding 7.55g/L hydrogen peroxide (the mass ratio of hydrogen peroxide to wastewater COD is 2.0:1) into the effluent obtained in the step (2) by using a pump;
and 4, step 4: controlling the pH of the system, dropwise adding alkali liquor into the step 3 by using a pump to control the pH of the system to be constant at 2.9, and reacting for 30 min;
and 5: and (4) adjusting alkali for the second time, taking the effluent obtained in the step (4), continuing to react for 90min, adding liquid alkali until the constant pH value is 6.0, and performing PAM (polyacrylamide) coagulation-aiding precipitation.
The COD of the final effluent is 165.05mg/L, and the removal rate of the COD is 85.42%.
Example 4
When the COD of the inlet water is lower than 1132mg/L, the steps of the embodiment 3 are repeated, so that the COD of the final outlet water is 145.8mg/L, and the removal rate of the COD is 85.42%.
The above embodiments are only intended to illustrate the preferred embodiments of the present invention, and it should be noted that, for those skilled in the art, various modifications and equivalent substitutions can be made without departing from the principle of the present invention, and the scope of the present invention is still covered by the claims.
Claims (9)
1. A method for treating MBR effluent of landfill leachate by a Fenton process is characterized by comprising the following steps of:
step 1: adding alkaline liquor to adjust the pH value of the effluent of the landfill leachate MBR;
step 2: adding a ferrous reagent into the effluent water obtained in the step 1;
and step 3: adding hydrogen peroxide into the effluent obtained in the step 2;
and 4, step 4: adding alkali liquor into the effluent water obtained in the step 3 to control the pH value of the effluent water to be in a constant range, wherein the reaction time is T1;
and 5: and (4) taking the effluent in the step (4), continuing to react for time T2, adding liquid alkali to a constant pH value, and flocculating.
2. The method for MBR effluent water of landfill leachate treatment by a Fenton process according to claim 1, wherein in the step 1, the pH value is adjusted to 8.0-9.5.
3. The method for MBR effluent water of landfill leachate treatment by a Fenton process according to claim 1, wherein in the step 1 and the step 4, the added alkali solution is liquid alkali or sodium carbonate or a mixture of the liquid alkali and the sodium carbonate.
4. The method for treating the MBR effluent of the landfill leachate according to the Fenton process, disclosed by claim 1, wherein in the step 2, the mass ratio of COD (chemical oxygen demand) of the hydrogen peroxide to the MBR effluent of the landfill leachate is (2.0-2.5): 1.
5. The method for MBR effluent of Fenton process treatment of landfill leachate according to claim 1, wherein in step 3, the molar ratio of ferrous ions to hydrogen peroxide is (0.8-1.2): 1.
6. The method for MBR effluent water of landfill leachate treatment by a Fenton process according to claim 1, wherein in the step 4, the pH is controlled to be constant at 2.8-3.0.
7. The method for treating MBR effluent of landfill leachate according to claim 1, wherein in step 4, T1 is 30 min.
8. The method for treating MBR effluent of landfill leachate according to claim 1, wherein in step 5, T2 is 90 min.
9. The method for MBR effluent water of landfill leachate treatment by a Fenton process according to claim 1, wherein in the step 5, liquid caustic soda is added to control the pH to be constant at 4.0-7.0.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102336483A (en) * | 2011-08-02 | 2012-02-01 | 北京洁绿科技发展有限公司 | Method and device for treating landfill leachate thick water |
| CN202148211U (en) * | 2011-08-02 | 2012-02-22 | 北京洁绿科技发展有限公司 | Treatment device of concentrated water generated by nano filtration and reverse osmosis membrane in garbage percolate treatment |
| CN105923850A (en) * | 2016-05-17 | 2016-09-07 | 浙江工商大学 | Treatment technology of refuse leachate membrane concentration liquid |
| CN109293161A (en) * | 2018-11-08 | 2019-02-01 | 南京万德斯环保科技股份有限公司 | A kind of landfill leachate MBR goes out water treatment technology |
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- 2019-12-30 CN CN201911400069.2A patent/CN111039463A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102336483A (en) * | 2011-08-02 | 2012-02-01 | 北京洁绿科技发展有限公司 | Method and device for treating landfill leachate thick water |
| CN202148211U (en) * | 2011-08-02 | 2012-02-22 | 北京洁绿科技发展有限公司 | Treatment device of concentrated water generated by nano filtration and reverse osmosis membrane in garbage percolate treatment |
| CN105923850A (en) * | 2016-05-17 | 2016-09-07 | 浙江工商大学 | Treatment technology of refuse leachate membrane concentration liquid |
| CN109293161A (en) * | 2018-11-08 | 2019-02-01 | 南京万德斯环保科技股份有限公司 | A kind of landfill leachate MBR goes out water treatment technology |
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