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Method and system for advanced treatment of landfill leachate MBR effluent water

A technology for landfill leachate and advanced treatment, applied in filtration treatment, polluted groundwater/leachate treatment, multi-stage water treatment, etc. Achieving good COD degradation and denitrification effects, overcoming the intractability of membrane dope, and good promotion prospects

Active Publication Date: 2019-03-29
NANJING WONDUX ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, most of the domestic garbage disposal methods in my country are sanitary landfill. During the landfill process, due to the rainwater and the liquid produced by the fermentation of the garbage itself mixed with surface water and groundwater, a waste with high concentration of organic matter and nitrogen is formed. Landfill leachate with complex components such as phosphorus, various heavy metal ions, bacteria and viruses, if not properly treated, landfill leachate will seriously pollute the surrounding environment, cause serious pollution to the surrounding surface water and groundwater, and seriously threaten the survival of human beings surroundings
At present, the domestic landfill leachate advanced treatment technology is mainly membrane filtration technology, but membrane filtration is a physical change process, and pollutants are transferred to the membrane concentrate after passing through the membrane. Therefore, the membrane concentrate still has high concentration of organic pollutants, complex components, High salt content, high heavy metal content and large water quality changes, direct discharge will seriously threaten the environment

Method used

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  • Method and system for advanced treatment of landfill leachate MBR effluent water

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Experimental program
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Effect test

Embodiment 1

[0044] COD (chemical oxygen demand) is 1000mg / L, TN (total nitrogen content) = 65mg / L landfill leachate MBR effluent advanced treatment method is as follows:

[0045] Step 1: Coagulation, take the landfill leachate MBR effluent and adjust to PH = 6, add 500mg / L polyferric sulfate to coagulate and precipitate, filter and then adjust the pH to 9, filter after standing to precipitate, so as to further remove residual ferric iron. The COD of the treated effluent is 600mg / L, the content of ammonia nitrogen is 15mg / L, and the content of total nitrogen is 55mg / L.

[0046] Step 2: DSA electrode electrooxidation, take the water from step 1 and place it in the electrolysis device. The maximum power of the constant current stabilized voltage supply is 75W, the current is 0-5A, the voltage is 0-15V, and the volume of the electrolytic tank is 1L. The cathode electrode plate is a DSA electrode plate, the anode electrode plate is a DSA electrode, and the effective area of ​​the electrode pl...

Embodiment 2

[0050] The advanced treatment method of MBR effluent of landfill leachate with COD of 1000mg / L and TN=65mg / L is as follows:

[0051] Step 1: Coagulation, take the landfill leachate MBR effluent and adjust to PH = 3, add 2000mg / L polyferric sulfate to coagulate and precipitate, filter and then adjust the pH to 9, filter after standing to precipitate, so as to further remove residual ferric iron. The COD of the treated effluent is 450mg / L, the content of ammonia nitrogen is 14mg / L, and the content of total nitrogen is 42mg / L;

[0052] Step 2: DSA electrode electrooxidation, take the water from step 1 and place it in the electrolysis device. The maximum power of the constant current stabilized voltage supply is 75W, the current is 0-5A, the voltage is 0-15V, and the volume of the electrolytic tank is 1L. The cathode electrode plate is a stainless steel electrode plate, the anode electrode plate is a DSA electrode, and the effective area of ​​the electrode plate is 96cm 2 ; The ...

Embodiment 3

[0056] The advanced treatment method of MBR effluent of landfill leachate with COD of 1300mg / L and TN=115mg / L is as follows:

[0057] Step 1: Coagulation, take the landfill leachate MBR effluent and adjust to PH = 3, add 1500mg / L polyferric sulfate to coagulate and precipitate, filter and then adjust the pH to 9, filter after standing to precipitate, so as to further remove residual ferric iron. The COD of the treated effluent is 700mg / L, the content of ammonia nitrogen is 30mg / L, and the content of total nitrogen is 105mg / L;

[0058] Step 2: DSA electrode electrooxidation, take the water from step 1 and place it in the electrolysis device. The maximum power of the constant current stabilized voltage supply is 75W, the current is 0-5A, the voltage is 0-15V, and the volume of the electrolytic tank is 1L. The cathode electrode plate is a DSA electrode plate, the anode electrode plate is a DSA electrode, and the effective area of ​​the electrode plate is 56cm 2 ; The current is...

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Abstract

The invention discloses a method for advanced treatment of landfill leachate MBR effluent water. The method comprises the following steps: taking the landfill leachate MBR effluent water, adjusting the pH value to 3-6, adding a medicament to carry out coagulation sedimentation, adjusting the pH value of filtered effluent water to 9, standing the effluent water to achieve sedimentation, and performing filtration; adding the filtered effluent water into a first electrolysis device, turning on an anode plate and a cathode plate, and carrying out DSA electrode electrooxidation; removing active chlorine from the effluent water subjected to the DSA electrode electrooxidation, transferring the active chlorine removed effluent water into a BAC device, and carrying out DSA enhanced biochemical treatment; and adding BAC enhanced biochemical treated effluent water into a second electrolysis device, turning on the cathode plate and the anode plate, and carrying out BDD electrode electrooxidation.The invention further discloses a system advanced treatment of landfill leachate MBR effluent water. The DSA electrode used in the biochemical pretreatment to perform pre-oxidization improves the subsequent biochemical effect, and the BDD electrode is combined to achieve further oxidation, so the treated landfill leachate MBR effluent reaches GB16889-2008 emission standards.

Description

technical field [0001] The invention belongs to the technical field of landfill leachate treatment, in particular to a method for advanced treatment of landfill leachate MBR effluent. Background technique [0002] At present, most of the domestic garbage disposal methods in my country are sanitary landfill. During the landfill process, due to the rainwater and the liquid produced by the fermentation of the garbage itself mixed with surface water and groundwater, a waste with high concentration of organic matter and nitrogen is formed. Landfill leachate with complex components such as phosphorus, various heavy metal ions, bacteria and viruses, if not properly treated, landfill leachate will seriously pollute the surrounding environment, cause serious pollution to the surrounding surface water and groundwater, and seriously threaten the survival of human beings environment. At present, the domestic landfill leachate advanced treatment technology is mainly membrane filtration te...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F103/06C02F101/30C02F101/12
CPCC02F1/001C02F1/283C02F1/4672C02F1/5236C02F1/66C02F3/34C02F9/00C02F2101/12C02F2101/30C02F2103/06C02F2301/08
Inventor 刘军高尚戴昕常邦华杨云军孙少龙袁道迎郭燕袁建海
Owner NANJING WONDUX ENVIRONMENTAL PROTECTION TECH CO LTD
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