Sludge double-reflux device and method for deep denitrification of landfill leachate based on anaerobic-aerobic-anoxic treatment

Abstract

The invention discloses a sludge double-reflux device and method for deep denitrification of landfill leachate based on anaerobic-aerobic-anoxic treatment, and belongs to the technical field of biological denitrification of wastewater with low carbon nitrogen ratio and high ammonia nitrogen content. The method comprises the following steps of: feeding of water into an anaerobic SBR, anaerobic stirring in the anaerobic SBR, discharging of water from the anaerobic SBR, feeding of water into an aerobic SBR, aerobic aeration in the aerobic SBR, discharging of water from the aerobic SBR, feeding of water into an anoxic SBR, anoxic stirring in the anoxic SBR, discharging of water from the anoxic SBR, sludge backflow in a first sedimentation tank and sludge backflow in a second sedimentation tank. The device and the method are suitable for the deep denitrification process of landfill leachate generated by waste sorting based on short-cut nitrification, short-cut denitrification and anaerobic ammonia oxidation. The device is simple in structure. The process is advanced and convenient for practical application, and conditions are provided for enrichment culture of sludge in different functional areas.

Description

technical field [0001] The invention relates to a sludge double-reflux device and method based on anaerobic-aerobic-anoxic deep denitrification of landfill leachate, which belongs to the technical field of biological denitrification of waste water with low carbon-to-nitrogen ratio and high ammonia-nitrogen, and is suitable for waste classification. Biological denitrification process of high ammonia nitrogen wastewater such as landfill leachate. Background technique [0002] In recent years, with the continuous improvement of the level of urbanization, the output of urban solid waste has also continued to increase. Although the trend of garbage classification is gradually rising, the waste classification and disposal will not reduce the moisture contained in the garbage itself. During the process of classification and treatment, there will still be A large amount of landfill leachate with toxic effects is produced. Landfill leachate has water quality characteristics such as ...

AI Technical Summary

Problems solved by technology

Currently widely used plug-flow anaerobic-anoxic-aerobic biological treatment process, on the one hand, the rear aerobic section performs short-range nitrification coupling anammox effluent needs further treatment, on the other hand, the front anoxic The short-range denitrification coupled with anammox is carried out in the section, and the multi-series sedimentation tanks are shared by the three functional areas. When the sludge returns, the sludge in the anoxic area will pass through the anaerobic area and the aerobic area in turn. However, the aerobic environment does not It is conducive to the growth and reproduction of microorganisms in the anoxic zone. The same sludge continuously passes through the anaerobic zone, the aerobic zone, and the anoxic zone. The reciprocating cycle will reduce the activity of microorganisms in the obligate functional zone in the sludge over time.

Affected the effect of deep denitrification of landfill leachate

At the same time, the sludge from different functional areas is mixed together, which is not conducive to the specific enrichment of sludge in each functional area

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