Combined landfill leachate treatment process

A landfill leachate and treatment process technology, applied in landfill leachate degradation, MVR system field, can solve the problems of secondary pollution, high cost, and the effluent can not meet the water environment discharge standards, to avoid iron sludge, high thermal stability , the effect of good industrial application prospects

Inactive Publication Date: 2017-05-24
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the effluent after treatment cannot meet the water environmental discharge standards, so it still needs to be combined with other processes for advanced treatment
In the MVR+DI process, the capacity of the ion exchange resin is limited, the processing capacity is low, the cost of resin reduction is high, and the reduction process is easy to cause secondary pollution; the membrane components in the membrane process are easily damaged and the price is high, and the biochemical process cannot meet some Wastewater treatment requirements, while being greatly affected by weather

Method used

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  • Combined landfill leachate treatment process
  • Combined landfill leachate treatment process

Examples

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Effect test

Embodiment 1

[0031] Taking leachate 60 tons / day as an example, COD of landfill leachate stock solution=40000~50000mg / L, NH 3 -N=1500~2000mg / L; COD=150~180mg / L of the condensate (about 90°C) after pretreatment and evaporation scrubbing, NH 3 -N=6~12mg / L, adjust the pH value to 6 in the water storage tank, and transport it to the bottom of the catalytic reaction tower; the catalyst in the catalytic reaction tower is 3wt.%Fe-0.5wt.%Mn / Al 2 o 3 , LHSV is 0.5h -1 , H 2 o 2 (mg / L): COD (mg / L) = 2.5; run for 300 hours, effluent COD = 20 ~ 40mg / L (such as figure 2 ), can directly meet the emission standards.

Embodiment 2

[0033] Taking leachate 600 tons / day as an example, landfill leachate stock solution COD=35000~40000mg / L, NH 3 -N=1000~1500mg / L; COD=80~120mg / L of the condensate (about 85°C) after pretreatment and evaporation scrubbing, NH 3 -N=8~15mg / L, adjust the pH value to 7 in the water storage tank, and transport it to the bottom of the catalytic reaction tower; the catalyst in the catalytic reaction tower is 3wt.%Fe-1wt.%Ce / Al 2 o 3 , LHSV is 1h -1 , H 2 o 2 (mg / L): COD (mg / L) = 3; after 200 hours of operation, the effluent COD = 40-45mg / L, which can be discharged directly up to the standard.

[0034] in conclusion:

[0035] The invention aims at the drawbacks and shortcomings of the existing landfill leachate treatment methods, integrates the heterogeneous catalytic wet hydrogen peroxide oxidation technology into the evaporation scrubbing system, and deeply degrades the landfill leachate. The reaction conditions are mild and can effectively remove COD and chroma of wastewater wit...

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Abstract

The invention discloses a combined landfill leachate treatment process. Landfill leachate is nondegradable sewage with the characteristics of great water quality changes (instable water quality), complex water quality (multiple heavy metal ions and ammonia nitrogen are contained), high organic concentration, low biodegradability and the like. The invention provides an efficient and feasible method for treating the landfill leachate. Pretreated leachate is treated by virtue of a combined MVR+CWPO process, and a deep CWPO degradation reaction is performed to achieve a relatively high COD removal rate by fully utilizing the high-temperature effluent of an MVR system, wherein a heterogeneous catalyst adopted for CWPO is relatively low in cost and easy to separate and recover, and the COD of the effluent can be kept below 50 mg / L after 300 h running under low temperature and normal pressure. The process is favorable for researches on harmless and resourceful treatment of the landfill leachate, and has great scientific and application significance, and the up-to-standard release requirement of the landfill leachate is met.

Description

technical field [0001] The invention relates to the field of sewage treatment and environmental functional materials, and specifically relates to integrating catalytic wet hydrogen peroxide oxidation technology using a heterogeneous catalyst into an MVR system to degrade landfill leachate. Background technique [0002] With the development of urban construction, the resulting garbage has also multiplied. Most solid waste in my country is disposed of by landfill or incineration. Landfill leachate is the liquid containing organic or inorganic components produced by the physical, biological, and chemical effects of compaction and fermentation during the landfill process, as well as the seepage of precipitation and other external water. Landfill leachate usually has the characteristics of large water quality changes (unstable water quality), complex water quality (containing a variety of heavy metal ions and ammonia nitrogen), high organic concentration, and poor biodegradabili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F103/06C02F101/30
CPCC02F9/00C02F1/041C02F1/048C02F1/722C02F1/725C02F2101/30C02F2103/06
Inventor 孙承林王亚旻卫皇曌赵颖杨旭
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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