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Coagulating/flocculating method for processing nanofiltration concentrate reject stream of early percolate at refuse landfills

A technology of landfill leachate and a treatment method, which is applied in the field of treatment of early leachate membrane concentrate in landfills, and achieves the effects of low operating cost and simple operation.

Inactive Publication Date: 2010-07-07
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The research and application of the coagulation / flocculation method to treat the early landfill leachate membrane filtration concentrate has not yet seen a report similar to this application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] In Example 1, the water quality indicators of the early-stage landfill leachate membrane filtration concentrate from A landfill site are: chromaticity 160 times, COD 280mg / L. Under the operating steps and parameter conditions of Example 1, the effluent water quality indicators are: chroma 35 times, COD 90mg / L, the removal rate reaches 78% and 68% respectively, and the effluent reaches GB 16889-2008 "Pollution of Domestic Garbage Landfill Site" It can be discharged directly according to the emission requirements in the Control Standards.

[0017] (2) Embodiment 2: For the early stage landfill leachate membrane filtration concentrated solution of A landfill, the pH value of the original concentrated solution is 8.3, and the pH value of the water sample does not need to be adjusted. The mixer is turned on, and the coagulation / flocculation agent adopts polyaluminum chloride ( PAC), the amount added (as Al 2 o 3 (meter) is 1000mg / L, first stir rapidly at a speed of 280r / mi...

Embodiment 2

[0018] In Example 2, the water quality indicators of the early landfill leachate membrane filtration concentrate from A landfill site are: chromaticity 160 times, COD 280mg / L. Under the operating steps and parameter conditions of embodiment 2, the effluent water quality index is: chroma 30 times, COD 82mg / L, removal rate reaches 81% and 71% respectively, effluent reaches GB16889-2008 " domestic waste landfill pollution control It can be directly discharged according to the discharge requirements in the Standard.

[0019] (3) Example 3: For the early stage landfill leachate membrane filtration concentrated solution of B landfill, the pH value of the original concentrated solution is 7.7, the pH value of the water sample is adjusted to 10, the mixer is turned on, and the coagulation / flocculation agent adopts polyaluminum ferric sulfate (PAFS), adding amount (as Al 2 o 3 Total) is 500mg / L, first stir rapidly at a speed of 200r / min for 2min, then slowly stir at a speed of 50r / mi...

Embodiment 3

[0020] In Example 3, the water quality indicators of the early stage landfill leachate membrane filtration concentrate from B landfill site are: chromaticity 150 times, COD 250mg / L. Under the operating steps and parameter conditions of Example 3, the effluent water quality indicators are: chroma 35 times, COD 85mg / L, the removal rate reaches 77% and 66% respectively, and the effluent reaches GB16889-2008 "Pollution Control of Domestic Garbage Landfill Site It can be directly discharged according to the discharge requirements in the Standard.

[0021] (4) embodiment 4: for B landfill early stage landfill leachate membrane filtration concentrated solution, former concentrated solution pH value is 7.7, adjusts water sample pH value to be 10, turns on agitator, coagulation / flocculation agent adopts polyaluminum sulfate ( PAS), the amount added (as Al 2 o 3 ) is 400mg / L, first stir rapidly at a speed of 200r / min for 3min, then stir slowly at a speed of 50r / min for 15min, and afte...

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PUM

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Abstract

The present invention relates to a coagulating / flocculating method for processing nanofiltration concentrate reject stream of early percolate at refuse landfills, which belongs to the technical field of environment protection. The present invention uses reasonable coagulating / flocculating agent kinds, coagulating / flocculating agent dosage, pH-value processing time and stirring time to adjust the pH-valve range of the nanofiltration concentrate reject stream to 7.5 to 10. Polymerization aluminum salt, polymerization alite, or composite salt is used as coagulating / flocculating agent. The feeding amount of the coagulating / flocculating agent is 50 to 1000 mg / L accounted by Al2O3. The coagulating / flocculating agent is stirred rapidly first at 100 to 280 r / min for 0.5 to 5 min; then, the coagulating / flocculating agent is stirred slowly at 20 to 100 r / min for 3 to 30 min; and solid-liquid separation is done. By the processing of the coagulating / flocculating method, the nanofiltration concentrate reject stream of early percolate can be discharged within controlling index of national standard.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to the treatment of the membrane concentrate produced after the landfill leachate is treated with "biochemical method + membrane method advanced treatment", especially relates to the treatment of the early leachate membrane concentrate of the garbage landfill deal with. Background technique [0002] Sanitary landfill is currently the most important treatment and disposal method for domestic waste in my country, and it is also the main treatment method in most foreign countries. The actual treatment technologies for landfill leachate are: ① treatment technology combining biological and physical and chemical methods; ② biochemical method + membrane filtration as the main treatment technology; ③ leachate backfilling landfill method. However, the most effective treatment method for landfill leachate is "biochemical method + membrane treatment" technology. [0003] In th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/66
Inventor 徐晓军黄进刚朱丽云安正阳赵宾宁平
Owner KUNMING UNIV OF SCI & TECH
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