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Landfill leachate treatment system and treatment method

A technology for landfill leachate and treatment system, applied in landfill leachate treatment system and treatment field, can solve the problems of deteriorating operating conditions, poor biodegradability, poor operating environment, etc., to reduce the number of equipment, improve oxygen utilization, reduce supporting The effect of the facility

Inactive Publication Date: 2017-12-01
EVERBRIGHT ENVIRONMENTAL TECH RES INST NANJING CO LTD +3
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

Landfill leachate is a high-concentration organic leachate with complex components, large changes in water quality and volume and non-periodical, which undoubtedly brings great difficulties to its effective and stable treatment. the puzzle
[0003] At present, the mainstream treatment process of landfill leachate in waste incineration power plants is "pretreatment + upflow anaerobic sludge bed reactor (Up-flow Anaerobic Sludge Bed / Blanket, UASB) + A / O process + ultrafiltration (UF)" , the aerobic treatment unit of the A / O process usually adopts the air aeration activated sludge method, the oxygen utilization rate is proportional to the immersion depth of the aeration device, but the power efficiency of the aeration device is proportional to the aeration device The immersion depth is inversely proportional, so its oxygen transfer efficiency is greatly limited, about 25%, which is relatively low
Existing air aeration generally adopts the blower jet aeration process. Due to the presence of detergents, colloidal organic matter and other surfactants in the leachate, a large number of small and light white-brown unstable foams will appear during the aeration process. Leachate-like leachate is a polymer synthetic substance with poor biochemical properties. If the amount of foam generated is too large, it will overflow from the pool, causing serious pollution to external equipment and external pool walls, deteriorating operating conditions, and seriously affecting the surrounding environment.
In addition, air aeration needs to be equipped with a blower, and then a blower room needs to be built, which brings problems such as high energy consumption, high engineering cost, and large floor area. In addition, the blower generates a lot of noise during operation, and the operating environment is relatively poor. Difference

Method used

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  • Landfill leachate treatment system and treatment method

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Embodiment 1

[0035] The invention provides a landfill leachate treatment system, such as figure 1 As shown, it includes anoxic pool 1, aerobic pool 2 and membrane pool 3 arranged in sequence; wherein, the aerobic pool 2 is provided with a pure oxygen aeration device 4, and the membrane pool 3 is provided with a curtain type ultra- filter membrane 5 , blowing aeration device 6 , and the bottom of the membrane pool 3 is also provided with a return pipe 7 communicating with the anoxic pool 1 .

[0036] In the landfill leachate treatment system provided by the present invention, it also includes an anaerobic pond arranged at the front end of the anoxic pond 1 , and a pretreatment unit arranged at the front end of the anoxic pond 1 .

[0037] The pretreatment unit is used for pretreatment of landfill leachate. Since the landfill leachate has the characteristics of high organic matter content, high heavy metal ion content, high ammonia nitrogen content, high salinity and poor biodegradability, ...

Embodiment 2

[0046] The invention provides a method for treating landfill leachate, such as figure 2 As shown, the main steps of the processing method include:

[0047] Step S201: performing denitrification reaction on the landfill leachate;

[0048] Step S202: performing nitrification treatment on the denitrification-treated product water, and performing pure oxygen aeration during the nitrification treatment;

[0049] Step S203: Ultrafiltration treatment is performed on the product water treated by the nitrification reaction.

[0050] The landfill leachate treatment method provided by the invention includes a pretreatment step.

[0051] Exemplarily, the pretreatment step adopts coagulation and precipitation, specifically, adding coagulant and coagulant aid in the coagulation tank, which can be fully mixed with the leachate and precipitated to remove heavy metal ions and alkaline earth metals in the leachate (calcium, magnesium), some non-heavy metals (arsenic, fluorine, sulfur, boron...

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Abstract

The invention provides a landfill leachate treatment system and treatment method. The landfill leachate treatment system comprises an anoxic pool, an aerobic pool and a membrane pool which are arranged sequentially, wherein a pure oxygen aeration device is arranged in the aerobic pool. According to the landfill leachate treatment system, the pure oxygen aeration device is arranged in the aerobic pool, oxygen utilization ratio of the landfill leachate treatment system can be increased, sludge volume index and emission load of volatile organic compounds can be reduced, and the number of equipment and supporting facilities can be reduced, so that the cost of a garbage power plant is reduced.

Description

technical field [0001] The invention relates to the field of leachate treatment, in particular, the invention relates to a landfill leachate treatment system and treatment method. Background technique [0002] Waste incineration power generation is a new urban waste disposal method in recent years. The garbage incineration plant must store the fresh garbage in the garbage storage pit for 3-5 days before incinerating the garbage, so as to achieve the purpose of leaching water and increasing the calorific value, so as to ensure the normal operation of the subsequent incinerator. The leachate in the process is the incineration plant landfill leachate. Landfill leachate is a high-concentration organic leachate with complex components, large changes in water quality and volume and non-periodical, which undoubtedly brings great difficulties to its effective and stable treatment. problem. [0003] At present, the mainstream treatment process of landfill leachate in waste inciner...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/26C02F103/06
CPCC02F3/26C02F2103/06Y02W10/10
Inventor 徐璜陈杰高用贵张林李敬
Owner EVERBRIGHT ENVIRONMENTAL TECH RES INST NANJING CO LTD
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