A biological treatment device and method for autotrophic deep denitrification of late-stage landfill leachate

Abstract

The invention belongs to the technical field of biological nitrogen removal of landfill leachate, and relates to a device and method for autotrophic advanced nitrogen removal biological treatment of mature landfill leachate, in particular to a device and method for step-feed biological treatment of mature landfill leachate. The device is provided with a raw water tank, an outlet water tank, an integrated autotrophic nitrogen removal SBR reactor, a PCL control system and online detection equipment. Three types of bacteria, namely, ammonia oxidation bacteria, anaerobic ammonium oxidation bacteria and denitrification bacteria mainly exist in the integrated autotrophic nitrogen removal SBR reactor. A heating device, a stirring device and an aeration device are arranged in the integrated autotrophic nitrogen removal SBR reactor. A water inlet unit, an aeration unit, another water inlet unit and an anoxic stirring unit are included in one reaction period, and mature landfill leachate is rapidly pumped into the reactor through a water inlet pump at each aeration and anoxic stirring stage. Partial nitrification is carried out in each aeration stage, and anaerobic ammonia oxidation and denitrification are completed in each anoxic stirring stage. The process is simple, operation and management are convenient, and the purpose of advanced nitrogen removal of mature landfill leachate is achieved without adding any external carbon source.

Description

technical field [0001] The invention relates to a biological treatment device and method for autotrophic deep denitrification of late-stage landfill leachate, which belongs to the technical field of biological denitrification of late-stage landfill leachate with low carbon-to-nitrogen ratio and high concentration of ammonia nitrogen, and is suitable for low C / N of late-stage landfill leachate, etc. Biological denitrification of high ammonia nitrogen wastewater. Background technique [0002] In recent years, with the increasing output of municipal solid waste, landfilling has gradually become the most widely used treatment and disposal method in the world. If the landfill leachate is not taken effective measures to control, it will seriously pollute the surface water or ground water. Due to the water quality characteristics of landfill leachate, such as complex composition, large changes in water quality and quantity, high concentration of organic matter and ammonia nitrogen...

AI Technical Summary

Problems solved by technology

[0007] Purpose of the present invention is exactly for the high NH of existing late landfill leachate + , low C / N, high treatment energy consumption and poor effluent stability, a biological treatment device and method for autotrophic deep denitrification of late-stage landfill leachate was proposed

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