Method and device for staring and stably maintaining short-cut nitrification and denitrification by controlling different anoxic and aerobic volume ratios

Abstract

The invention discloses a method and device for staring and stably maintaining short-cut nitrification and denitrification by controlling different anoxic and aerobic volume ratios. The method includes the following steps that firstly, sludge is cultivated and acclimated; secondly, short-cut nitrification and denitrification are started, wherein by controlling the DO concentration of an aerobic zone and adjusting the volume ratio of an anoxic zone to the aerobic zone to be 5:3-6:2, a short-cut nitrification and denitrification system is started; thirdly, short-cut nitrification and denitrification are stably maintained, wherein according to inflow water quality changes and daily monitoring conditions, short-cut nitrification and denitrification are stably maintained by adjusting the DO concentration of the aerobic zone and changing the volume ratio of the anoxic zone to the aerobic zone. After the system runs stably, the ammonia and nitrogen removing rate reaches 91.35%, and the accumulation rate of nitrite in water flowing out of an aerobic pond is 91.15%. Short-cut nitrification and denitrification are started and stably maintained in the continuous flow A / O technology, and the problem that short-cut nitrification and denitrification are difficult to start and stably maintain in a continuous flow urban domestic sewage treatment system is solved.

Description

technical field [0001] The invention relates to a method and a device for starting and stably maintaining short-range nitrification and denitrification by controlling different anaerobic volume ratios, and belongs to the field of sewage treatment. Background technique [0002] At present, water eutrophication has become a global water environment problem. In my country's Chaohu Lake, Taihu Lake, Dianchi Lake and other lakes, serious water eutrophication problems occur every year. The main reason for the eutrophication of the water body is the excessive discharge of nutrients such as nitrogen and phosphorus, especially the excessive discharge of nitrogen, which causes a large number of algae in the water body to grow, resulting in a decrease in dissolved oxygen in the water body, a large number of fish in the water die, and the water body becomes stinky. black. "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002) has made strict regulations on the...

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Problems solved by technology

[0004] At present, the realization of short-cut nitrification and denitrification process is still limited to high ammonia nitrogen wastewater such as landfill leachate, and the research on low C / N ratio wastewater treatment by short-cut nitrification and denitrification process is mostly concentrated in batch SBR system

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