Treating method for landfill leachate

A landfill leachate and leachate technology, which is applied in water/sewage treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc., can solve the problems of not meeting the requirements of the secondary standard, large floor space, and high operating costs , to achieve the effects of strong ability to adapt to water quality changes, high impact load resistance, and high degree of automation

Inactive Publication Date: 2014-03-26
NANJING WONDUX ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) Poor ability to adapt to water quality changes, especially poor ability to adapt to water quality changes throughout the landfill period
As the landfill leachate water quality prolongs with the landfill time, the BOD 5 / COD CR It shows a downward trend, and the system will run well in the early stage of landfill, but the system will not adapt to it in the later stage
[0005] (2) Cannot meet the requirements of the secondary standard in my country (GB16889-1997)
[0006] High concentration of organic pollutants and refractory substances and high concentration of ammonia nitrogen lead to long process flow, many structures, complex management, large floor area, high operating costs, and effluent COD CR and ammonia nitrogen are not easy to reach the standard

Method used

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  • Treating method for landfill leachate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: as figure 1 Shown, a kind of method for processing landfill leachate, its technological process comprises the following steps:

[0017] (1) Water quality regulation

[0018] The landfill leachate is passed into the adjustment tank, and an impeller stirring device is installed in the adjustment pool, and the landfill leachate is mixed evenly through stirring, so that the water quality and quantity of the landfill leachate can be adjusted, and the impact load resistance of the subsequent treatment process can be improved. The water quality and water quantity entering the follow-up treatment unit are basically stable through the regulating pool, and the impact of water quality and water quantity on the follow-up treatment unit is reduced.

[0019] (2) coagulation filtration

[0020] Transfer the uniformly mixed leachate in step (1) to the microfiltration membrane tank, add PAC (polyaluminum chloride) and PAM (polyacrylamide) to the leachate for coagulat...

Embodiment 2

[0026] Example 2: It is basically the same as Example 1, except that in step (2), the dosage of coagulant PAC is 500 mg / L, and the dosage of PAM is 15 mg / L.

[0027] The volume of the treated dope in step (3) is about 10% of the volume of landfill leachate.

[0028] During electrolysis in step (4), the current density is 40mA / cm 2 , Voltage 6V.

[0029] The result after adopting the present invention: after the landfill leachate is treated, the removal rate of COD can reach 95.7%, the removal rate of BOD can reach 95.9%, and the removal rate of ammonia nitrogen can reach 95.2%.

Embodiment 3

[0030] Example 3: It is basically the same as Example 1, except that in step (2), the dosage of coagulant PAC is 800 mg / L, and the dosage of PAM is 20 mg / L.

[0031] The volume of the treated dope in step (3) is about 5% of the volume of landfill leachate.

[0032] During electrolysis in step (4), the current density is 60mA / cm 2 , Voltage 10V.

[0033] The result after adopting the present invention: after the landfill leachate is treated, the removal rate of COD can reach 96.4%, the removal rate of BOD can reach 96.8%, and the removal rate of ammonia nitrogen can reach 95.8%.

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Abstract

The invention relates to a treating method for landfill leachate. The method comprises the following steps: introducing landfill leachate into a regulating tank, carrying out uniform mixing and adjusting the quality and quantity of water; then adding a coagulant into the leachate for coagulating sedimentation and filtration so as to remove metal ions, SS and a part of organic matters in the leachate; introducing the treated leachate into an MVC evaporation plant for evaporation so as to remove the majority of COD, BOD and pollutants like ammonia nitrogen, metal ions and TDS in the leachate; and introducing the treated leachate into an electrolytic bath for oxidation so as to remove a small amount of residual ammonia nitrogen and COD in condensed water and discharging effluent reaching the standard. The treating method provided by the invention has the advantages of strong adaptive capability to changes of water quality, high resistance to impact load, a short treatment cycle, high treating efficiency, a small occupied land area, a high degree of automation, low cost, a good removal effect on ammonia nitrogen, COD, heavy metal ions, TDS and chroma, a clearance rate of more than 95% and capacity of allowing effluent quality to meet national discharge standards in China.

Description

technical field [0001] The invention relates to a method for treating landfill leachate. Background technique [0002] Landfill leachate refers to the black-brown-red liquid that seeps out of landfills due to fermentation, rainwater leaching, scouring, and surface water soaking during garbage stacking and landfilling. It is a kind of high-concentration organic wastewater with complex components, large changes in water quality and quantity, and long-lasting hazards. It is one of the main factors causing secondary pollution in the process of landfilling. Generally speaking, the pH of landfill leachate is between 4 and 9, and the COD CR In the range of 2000~62000mg / L, BOD 5 In the range of 60-45000mg / L. [0003] Due to the high pollution load of landfill leachate, it is difficult to treat it. Not only the effectiveness and stability of the treatment project, but also the economic rationality of the process must be considered. At present, the treatment methods of landfill le...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F1/52C02F1/56C02F1/461
Inventor 张爱均张建国刘军宫建瑞
Owner NANJING WONDUX ENVIRONMENTAL PROTECTION TECH CO LTD
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