Landfill leachate treatment system and treatment method

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...

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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

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