Treatment process of landfill leachate

Abstract

The invention discloses a treatment process of landfill leachate. According to the technical scheme, the treatment process is characterized by comprising the following steps of S11, regulating and storing landfill leachate, namely, pumping the landfill leachate into a regulating tank, and regulating the water quality and the water quantity of the landfill leachate; and S12, removing suspended impurities, namely, pumping the landfill leachate in a regulating tank into a coagulative precipitation tank by using a water pump, and then putting a flocculating agent into the coagulative precipitation tank by using a dosing device to flocculate and precipitate the suspended impurities in the landfill leachate. According to the landfill leachate treatment process, a good and stable removal effect on controlled pollutants can be guaranteed, after effluent is filtered by an MBR membrane, the load of a subsequent NF nanofiltration membrane and RO ultrafiltration membrane treatment system is reduced, the effluent quality and the stability of the effluent quantity are ensured, the service life of the NF nanofiltration membrane and the RO ultrafiltration membrane is prolonged, and the use and maintenance cost of equipment is reduced.

Description

technical field [0001] The invention belongs to the field of landfill leachate treatment technology, in particular to a landfill leachate treatment process. Background technique [0002] The treatment of leachate in urban waste landfills has always been a very difficult problem in the design, operation and management of landfills. Leachate is the product of gravity flow of liquid in a landfill, mainly from precipitation and the embedded water of the waste itself. Since many factors may affect the properties of the leachate during the flow of the liquid, including physical factors, chemical factors and biological factors, the properties of the leachate vary within a considerable range. Generally speaking, its pH value is between 4-9, COD is in the range of 2000-62000mg / L, BOD5 is from 60-45000mg / L, and the concentration of heavy metals is basically the same as that in municipal sewage. The leachate of urban waste landfill is a kind of high-concentration organic wastewater w...

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Problems solved by technology

[0004] The above-mentioned patent has an alkaline aluminum chloride coagulation process added behind the traditional process. After the electrolytic treatment, the seepage enters the alkaline aluminum chloride coagulation tank, and the BOD5, which is difficult to completely degrade, is reduced to below 100mg / L, and the CODCr The removal rate is higher, so that the sewage can reach the standard of discharge, which plays a vital role in the protection of the environment, but it also has defects, such as: its elimination of pollutants is not strong, and it cannot guarantee the specific pollutants. Eliminate the effect

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