Device and method for intermittent aeration and simultaneous nitrification and denitrification combined with short-range denitrification and anammox to achieve deep denitrification of domestic sewage

Abstract

The invention relates to a device and a method for realizing deep denitrification of domestic sewage by synchronous nitrification and denitrification combined with short-range denitrification and anammox with intermittent aeration, and belongs to the field of sewage biological treatment. The device includes excess sludge fermentation tank, mud-water separator, raw water tank, intermediate water tank, two sequencing batch SBR reactors, air compressor, peristaltic pump, etc. The method is to add domestic sewage into the first sequence batch reactor, and remove all ammonia nitrogen and most of the total nitrogen through synchronous nitrification and denitrification under the intermittent aeration mode; In the second-sequence batch reactor, the remaining nitrite and nitrate are removed through short-range denitrification coupled with anaerobic ammonium oxidation, and finally realize the deep denitrification of domestic sewage. The invention is suitable for low C / N urban domestic sewage, can reduce aeration, reduce energy consumption, homogenize the concentration of organic matter in domestic sewage, slow down the consumption speed of organic matter, improve the efficiency of denitrification, and realize resource utilization of excess sludge at the same time.

Description

technical field [0001] The invention relates to an optimization control technology for deep denitrification of domestic sewage by using intermittent aeration, synchronous nitrification and denitrification combined with short-range denitrification and anammox, and belongs to the field of biological treatment of urban domestic sewage. This process is suitable for the deep denitrification of low C / N urban domestic sewage. Background technique [0002] With the continuous growth of population and the continuous improvement of people's living standards, the per capita discharge of domestic sewage continues to increase, coupled with the widespread use of detergents, the nitrogen and phosphorus content in urban sewage is relatively high, and after being discharged into water bodies, the nitrogen and phosphorus in receiving water bodies An increase in the content will lead to eutrophication of the water body, damage the water body environment, and affect the water supply quality. I...

AI Technical Summary

Problems solved by technology

[0003] In terms of the mechanism of biological denitrification, in the conventional biological denitrification process, NH 4 + -N converted to NO 3 - -N and NO 2 - -N, and then heterotrophic denitrifying bacteria reduce nitrate nitrogen and nitrite nitrogen to nitrogen under anoxic conditions with an additional carbon source as an electron donor. Large, low C / N, requires a large amount of external carbon source, and the processing cost increases sharply

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