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A method and system for treating mbr effluent of landfill leachate

A technology for landfill leachate and effluent treatment, which is applied in infiltration/dialysis water/sewage treatment, polluted groundwater/leachate treatment, water/sewage treatment, etc., and can solve technical problems such as membrane dope

Active Publication Date: 2021-06-29
NANJING WONDUX ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of existing membrane treatment systems, the present invention provides a landfill leachate MBR effluent treatment method and system, which can solve the technical problems of membrane dope existing in the existing landfill leachate treatment routes

Method used

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  • A method and system for treating mbr effluent of landfill leachate
  • A method and system for treating mbr effluent of landfill leachate
  • A method and system for treating mbr effluent of landfill leachate

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Experimental program
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Effect test

Embodiment 1

[0056] Embodiment 1: Adopt the method of the present invention to treat the MBR effluent of a landfill leachate treatment plant, COD (chemical oxygen demand)=800~900mg / L, TDS (total dissolved solids)=6000~8000mg / L, NH 3 -N=150~200mg / L, the waste water passes through the electro-oxidation unit, and the current density is controlled at 200~300A / m 2 , the control voltage is 4~6V, after electrolysis, COD in the landfill leachate MBR effluent = 500~600mg / L, TDS=6000~8000mg / L, NH 3 -N=20~50mg / L, [·Cl]≈300mg / L in the landfill leachate MBR effluent. After acid adjustment and aeration by the dechlorination unit, the [·Cl] in the effluent of the landfill leachate MBR = 0 mg / L; the waste water after dechlorination enters the aerobic biochemical treatment unit to reduce the COD in the effluent of the landfill leachate MBR to 330~ 370mg / L, NH 3 -N=10~20mg / L; the biochemical effluent is further treated by electro-oxidation, and the current density is 100A / m 2 , the tank voltage is 3.5~4....

Embodiment 2

[0057] Embodiment 2: Adopt the method of the present invention to treat the MBR effluent of a certain refuse landfill, COD=750~850mg / L, TDS=10000~15000mg / L, NH 3 -N=150~200mg / L, the waste water passes through the electro-oxidation unit, and the electrolysis current density is controlled to be 150~250A / m 2 , the operating voltage of the electrolyzer is 3.5-5.5V. After the electrolysis operation is completed, the COD in the landfill leachate MBR effluent = 500-600mg / L, TDS = 10000-15000mg / L, NH 3 -N=20~50mg / L, [·Cl]≈400mg / L in the landfill leachate MBR effluent. After acid adjustment and aeration, a large amount of active chlorine in the landfill leachate MBR effluent is removed, and the final rate is 0.5kg / m 3 Sodium sulfite is added to make the landfill leachate MBR effluent [·Cl]=0mg / L. After dechlorination, the landfill leachate MBR effluent enters the MBR aerobic biochemical treatment system for a residence time of 4 to 24 hours to remove biochemical organic matter in the...

Embodiment 3

[0058] Embodiment 3: Using the method of the present invention to treat MBR effluent from a waste-to-energy plant, COD=920~1100mg / L, TDS=13000~18000mg / L, NH in the waste water 3 -N=300~400mg / L, the waste water passes through the electro-oxidation unit, and the electrolytic current density is adjusted to 300~450A / m 2 , control the tank voltage at 4.5-6.0V, after the electrolysis is completed, COD in the landfill leachate MBR effluent = 550-650mg / L, NH 3 -N=20~50mg / L, [·Cl]≈350mg / L in the landfill leachate MBR effluent. A large amount of active chlorine in the waste water is removed through acid adjustment and aeration, and then a small amount of sodium sulfite is added to make the [·Cl] in the landfill leachate MBR effluent = 0 mg / L. The deactivated chlorine landfill leachate MBR effluent enters the MBR treatment system of the aerobic biochemical unit, and the residence time is 8 to 24 hours to remove biochemical organic matter in the landfill leachate MBR effluent treated by ...

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Abstract

The invention provides a method and system for treating landfill leachate MBR effluent, comprising: removing part of the COD in the landfill leachate MBR effluent by electrolysis, and simultaneously converting some refractory macromolecular organic matter into biochemical small molecular organic matter ;Adjust the pH value of the obtained product water to 4~6, then remove most of the active chlorine in the product water by aeration, and then remove the remaining active chlorine and oxidative substances in the product water by adding a reducing agent; use MBR membrane Bioreactor or activated carbon biofilter realizes aerobic biochemical process to remove small molecule organic matter that can be biochemically treated in the effluent; adopts advanced oxidation treatment process to remove organic matter that is difficult to biochemically treat in the effluent; absorbs organic matter in the effluent through activated carbon and discharges up to the standard . The present invention can solve the technical problem of membrane thick liquid existing in the existing landfill leachate treatment route, and can achieve the purpose of fully quantitative treatment of the landfill leachate MBR effluent.

Description

technical field [0001] The invention relates to the technical field of landfill leachate treatment, in particular to the MBR effluent treatment technology of the landfill leachate treatment process. Background technique [0002] Landfill leachate is a kind of high-concentration organic wastewater produced in the process of garbage collection, transportation and treatment. It has the characteristics of many types of pollutants, complex components, and extremely unstable changes. [0003] my country's landfill leachate discharge requirements are very strict. If it is discharged directly in non-sensitive areas, the standards in Table 2 of the "Standards for Pollution Control of Domestic Waste Landfills" (GB16889-2008) shall be implemented, among which COD≤100mg / L, ammonia nitrogen≤25mg / L, Total nitrogen ≤ 40mg / L, total phosphorus ≤ 3mg / L, in addition, some heavy metal indicators also need to meet the corresponding discharge standards. [0004] At present, the mainstream landfil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F103/06C02F101/30C02F101/16C02F101/12
CPCC02F1/24C02F1/281C02F1/44C02F1/461C02F1/66C02F1/70C02F1/72C02F3/02C02F9/00C02F2101/12C02F2101/16C02F2101/30C02F2103/06
Inventor 刘军高兴旺常邦华宫建瑞戴昕杨云军袁建海
Owner NANJING WONDUX ENVIRONMENTAL PROTECTION TECH CO LTD
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