Refuse landfill leachate treatment method

Abstract

The invention discloses a refuse landfill leachate treatment method. The refuse landfill leachate treatment method comprises the following steps that: landfill leachate directly enters a biological treatment stage through adjusting tanks which sequentially comprise a denitrification tank, a micro-aerobic aeration tank and a sedimentation tank, and in the micro-aerobic aeration tank, efficient low-consumption denitrogenation and easily degradable organic material removal are realized through muddy water backflow and micro dissolved oxygen control; and then the processed landfill leachate enters an advanced treatment stage, ammonia nitrogen and organic materials in biochemical tail water are removed through a sulfate radical anion based advanced oxidative coupling coagulation method, the biodegradability is greatly improved, and tail water subjected to oxidation treatment can be discharged through biological degradation. After treatment through the method, all indexes of the effluent meet the standards of Chart 2 in Standard for Pollution Control on the Landfill Site of Municipal Solid Waste (GB 16889-2008). According to the invention, the micro-aerobic denitrogenation and sulfate radical anion advanced treatment methods are comprehensively utilized, so that the advantages of high economical efficiency, good adaptability to relatively large water quality fluctuation and stable and reliable treatment effects are achieved, and the refuse landfill leachate treatment method is suitable for low-consumption treatment of leachate, particularly leachate with a low C / N ratio.

Description

technical field [0001] The invention relates to a treatment method for leachate from landfills of municipal domestic garbage, which belongs to the field of domestic garbage treatment. Background technique [0002] According to the social and economic development of our country, sanitary landfill is still the main way and means of harmless treatment and disposal of municipal solid waste in my country due to its simple process, low investment, large processing capacity and low operating cost. The landfill process produces a large amount of high-concentration landfill leachate (NH 4 + -N concentration up to 800-5000 mg / L). The up-to-standard treatment of high-concentration landfill leachate is an important link that every sanitary landfill must solve. In 2008, my country promulgated the "Pollution Control Standards for Domestic Waste Landfill Sites" (GB16889-2008), which put forward very high requirements for leachate treatment, especially carbon and nitrogen removal, and req...

AI Technical Summary

Problems solved by technology

However, during the application, it was found that in addition to the problems of high power consumption of the biological treatment unit and insufficient carbon source, the double-membrane method is more serious because of serious membrane pollution, short replacement time, no outlet for the concentrate produced by membrane separation, and most of the concentrate The operating cost of the treatment method is high, which eventually leads to the high operating cost of leachate, which is unbearable for general small and medium-sized landfills! Therefore, the non-membrane advanced treatment technology that chooses to replace the membrane needs to be solved urgently.

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