Method and system for treating landfill leachate

Abstract

The invention relates to a landfill leachate treatment method and a system thereof, and belongs to the technical field of sewage biological treatment. The method comprises the following steps: a landfill leachate containing high concentration organic pollutants and ammonia nitrogen enters an anaerobic treatment unit to remove most organic pollutants and reduce the C / N ratio to below 2:1; the obtained landfill leachate enters an anaerobic ammoxidation unit to realize the ammonia nitrogen removal rate of 85% and the total nitrogen removal rate of 80% without adding an external carbon source; and the obtained landfill leachate enters a biochemical treatment unit, the aerobic segment of the biochemical treatment unit is a membrane bioreactor generally, and a carbon oxidation reaction and a nitrification and denitrification reaction are carried out to further remove the remaining organic pollutants, ammonia nitrogen and total nitrogen. The method has the advantages of no need of the external carbon source, high nitrogen removal efficiency, stable system running, and low output of residual sludge. The anaerobic treatment unit can greatly reduce the organic matters in water, regenerates biogas and uses the biogas, and the tank body of the anaerobic ammoxidation unit is heated and insulated, so recycling of the organic matters in the leachate is realized, and the treatment cost is further reduced.

Description

technical field [0001] The invention relates to a landfill leachate treatment method and system thereof, in particular to landfill leachate treatment with high ammonia nitrogen and high COD, and belongs to the technical field of sewage biological treatment. Background technique [0002] Landfill leachate has the characteristics of complex pollution components, high pollutant concentration, many pollutant types, and C / N ratio imbalance. Its COD concentration is usually 2000mg / L-50000mg / L, and ammonia nitrogen concentration is 2000mg / L-8000mg / L; Due to the short fermentation time of the leachate produced by incineration plants, garbage stations and other facilities, the literature shows that its chemical oxygen demand (hereinafter referred to as COD), ammonia nitrogen concentration can be as high as 80000mg / L, 10000mg / L, the concentration of pollutants is too high, C / N Characteristics such as severe imbalance of the ratio pose a huge technical challenge to the standard treatme...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to propose a landfill leachate treatment method and its system, using the combined process of multi-stage anaerobic, anaerobic ammonium oxidation and other technical units to solve the problems of high energy consumption and the need to add additional carbon sources in traditional treatment technologies , Unstable water output and other shortcomings, so it can be applied to the treatment of landfill leachate in waste landfills, waste incineration plants and other facilities

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