Method for treating middle and late stage landfill leachate by continuous flow short-cut nitrification/endogenous short-cut denitrification/anaerobic ammonia oxidation integrated process

Abstract

The invention discloses a method for treating middle and late stage landfill leachate by a continuous flow short-cut nitrification/endogenous short-cut denitrification/anaerobic ammonia oxidation integrated process, and belongs to the field of biological treatment of high-ammonia nitrogen sewage. Middle-late stage landfill leachate enters an AOA continuous flow reactor to operate in an A/O/A (anaerobic/aerobic/anoxic) mode, and total nitrogen removal is achieved through a PN/A-ED/A (short-cut nitrification/anaerobic ammonia oxidation-endogenous short-cut denitrification/anaerobic ammonia oxidation) combined process. Microorganisms in the anaerobic section absorb an external carbon source in inlet water and store the external carbon source as an intracellular carbon source, short-cut nitrification is carried out in the aerobic section, and ammonia nitrogen in the inlet water is partially oxidized into nitrite nitrogen; and in the anoxic section, anaerobic ammonia oxidation is firstly carried out to generate part of nitrate nitrogen, the nitrate nitrogen is reduced into nitrite nitrogen through endogenous short-cut denitrification, and the nitrite nitrogen is provided for anaerobic ammonia oxidation reaction; 95.3% of total nitrogen in the middle and late stage landfill leachate is removed through the continuous flow reactor, and the continuous flow reactor is suitable for deep denitrification treatment of high-ammonia-nitrogen wastewater such as the landfill leachate.

Description

technical field [0001] The invention relates to a continuous-flow short-path nitrification / endogenous short-path denitrification / anammox integrated process method for treating mid-late stage landfill leachate, which belongs to the field of biological treatment of high-ammonia-nitrogen sewage. Background technique [0002] In recent years, with the acceleration of urban development in my country, the output of urban domestic waste is also increasing. Traditional waste disposal methods include landfill, incineration, and composting, and landfill disposal is the most widely used method. The garbage that needs to be landfilled is transported to the landfill after preliminary treatment. After the landfill, the highly polluted wastewater produced by the garbage along with the precipitation of landmarks, the inflow of surface water, and its own decomposition of water is landfill leachate. Landfill leachate is a kind of Wastewater with high concentrations of organic matter and ammon...

AI Technical Summary

Problems solved by technology

Late landfill leachate belongs to high-ammonia-nitrogen wastewater, with extremely high ammonia-nitrogen concentration, complex organic components, low biodegradable organic matter, and low carbon-nitrogen ratio. According to the traditional nitrification and denitrification biological denitrification technology, the carbon source of landfill leachate is far away. Insufficient, it needs to add a large amount of external carbon source for denitrification, resulting in low denitrification efficiency, low utilization rate of carbon source, high operating cost and other problems in the treatment of middle and late leachate

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