Advanced treating method of landfill leachate

A technology for landfill leachate and advanced treatment, applied in the field of advanced treatment, can solve problems such as environmental pollution, advanced treatment process has not yet been reported, etc., achieves good sensory effects, saves pH adjustment operations, and reduces costs.

Inactive Publication Date: 2010-04-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the 1960s and 1970s, garbage sanitary landfill was widely adopted by most countries as the most economical and convenient urban garbage disposal method. Since the 1980s, my country began to build garbage sanitary landfills. Up to now, there are 93% of urban waste is landfilled, so there are serious environmental pollution problems and hidden dangers
However, it has not been reported that it is used for the advanced treatment of landfill leachate, especially the leachate of old landfills.

Method used

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  • Advanced treating method of landfill leachate

Examples

Experimental program
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Effect test

Embodiment 1

[0042] The advanced treatment process of landfill leachate includes the following steps and process conditions:

[0043] (1) Polyferric coagulation treatment: when the landfill leachate is pumped into the polyferric reaction sedimentation tank through the regulating tank, polyferric (FeSO 4 ·7H 2 O) Amount 0.45mL·L -1 , carry out poly-iron coagulation treatment;

[0044] (2) Fenton oxidation treatment: After polyferric coagulation, the supernatant flows into the Fenton oxidation pool, and FeSO is added to the water inlet 4 and H 2 o 2 The medicine, the medicine is: [Fe 2+ ] is 0.06mol L -1 ,[H 2 o 2 ] is 0.06mol L -1 , the reaction time is 3.5h;

[0045] (3) Neutralization and precipitation: After the wastewater is oxidized by Fenton, it flows into the neutralization tank, and the pH is adjusted to 6-8; after the wastewater is neutralized, synthetic polyacrylamide (RAM) is added to coagulate and precipitate in the sedimentation tank, and the waste water to be treated...

Embodiment 2

[0052] The advanced treatment process of landfill leachate includes the following steps and process conditions:

[0053] (1) Polyferric coagulation treatment: when the landfill leachate is pumped into the polyferric reaction sedimentation tank through the regulating tank, polyferric (FeSO 4 ·7H 2 O) Amount 0.35mL·L -1 , carry out poly-iron coagulation treatment;

[0054] (2) Fenton oxidation treatment: After polyferric coagulation, the supernatant flows into the Fenton oxidation pool, and FeSO is added to the water inlet 4 and H 2 o 2 The medicine, the medicine is: [Fe 2+ ] is 0.10mol L -1 ,[H 2 o 2 ] is 0.10mol L -1 , the reaction time is 3.6h;

[0055] (3) Neutralization and precipitation: After the wastewater is oxidized by Fenton, it flows into the neutralization tank, and the pH is adjusted to 6-8; after the wastewater is neutralized, synthetic polyacrylamide (PAM) is added to coagulate and precipitate in the sedimentation tank, and the waste water to be treated...

Embodiment 3

[0062] The advanced treatment process of landfill leachate includes the following steps and process conditions:

[0063] (1) Polyferric coagulation treatment: when the landfill leachate is pumped into the polyferric reaction sedimentation tank through the regulating tank, polyferric (FeSO 4 ·7H 2 O) Amount 0.30mL·L -1 , carry out poly-iron coagulation treatment;

[0064] (2) Fenton oxidation treatment: After polyferric coagulation, the supernatant flows into the Fenton oxidation pool, and FeSO is added to the water inlet 4 and H 2 o 2 The medicine, the medicine is: [Fe 2+ ] is 0.12mol L -1 ,[H 2 o 2 ] is 0.12mol L -1 , the reaction time is 3.9h;

[0065] (3) Neutralization and precipitation: After the wastewater is oxidized by Fenton, it flows into the neutralization tank, and the pH is adjusted to 6-7.5; after the wastewater is neutralized, synthetic polyacrylamide (PAM) is added to coagulate and precipitate in the sedimentation tank, and the waste water to be treat...

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Abstract

The invention discloses an advanced treating method of landfill leachate, which comprises the steps of: discharging eobiont-treated landfill leachate waste water into an adjusting pond; pumping the waste water in the adjusting pond into a polymeric ferrum reaction precipitation pond with a waste water metering pump to evenly mix polymeric ferrum agent with the waste water, and treating liquid supernatant which flows into an Fento oxidation pond by means of advanced oxidation after coagulating polymeric ferrum; leading the water to flow into a neutralization pond after the advanced oxidation to adjust the pH value of the waste water at 6-8, and adding PAM into the precipitation pond to carry out coagulation precipitation after neutralizing the waste water; and pumping liquid supernatant of the precipitation pond into a biological filler filter to carry out biological treatment, putting filler into the pond, sufficiently aerating to carry out aerobic treatment, and draining at the top of the pond through a water outlet weir, wherein the quality of the outlet water achieves landfill leachate state first-grade discharge standard. Sludge in the polymeric ferrum reaction pond and the precipitation pond can be directly transported to landfill areas to be landfilled after dehydration treatment.

Description

technical field [0001] The invention relates to the treatment of landfill leachate, in particular to a method for advanced treatment of secondary effluent of landfill leachate after anaerobic and aerobic biological treatment by adopting high-efficiency coagulation, Fenton oxidation, and biological filter as main processes. Background technique [0002] In the 1960s and 1970s, garbage sanitary landfill was widely adopted by most countries as the most economical and convenient urban garbage disposal method. Since the 1980s, my country began to build garbage sanitary landfills. Up to now, there are 93% of urban waste is landfilled, so there are serious environmental pollution problems and hidden dangers. After the landfill, there is a considerable amount of leachate in the landfill due to the fermentation of the waste, the infiltration of rainwater, and the rise of the groundwater level. It will cause serious pollution to the groundwater and surface water around the garbage dum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/52C02F1/72C02F1/66C02F3/12
CPCY02W10/10
Inventor 周少奇钟红春
Owner SOUTH CHINA UNIV OF TECH
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