Device and method for deep denitrification of domestic sewage through combination of intermittent-aeration-mode simultaneous nitrification and denitrification with short-range denitrification-anaerobic ammonium oxidation

Abstract

The invention provides a device and method for deep denitrification of domestic sewage through the combination of intermittent-aeration-mode simultaneous nitrification and denitrification with short-range denitrification anaerobic ammonium oxidation, belonging to the field of biological treatment of sewage. The device comprises an excess sludge fermentation cylinder, a sludge-water separator, a raw water tank, an intermediate water tank, two sequencing batch SBR reactors, an air compressor, a peristaltic pump, and the like. The method comprises the following steps: add domestic sewage into thefirst sequencing batch reactor, and removing all the ammonia nitrogen and the most of total nitrogen through simultaneous nitrification and denitrification in an intermittent aeration mode; and allowing discharge water of the previous step and sludge fermentation broth obtained after sludge-water separation to enter the second sequencing batch reactor, and removing left nitrite and nitrate nitrogen through coupled short-range denitrification-anaerobic ammonium oxidation so as to eventually realize deep denitrification of domestic sewage. The device and method of the invention are applicable to low-C / N urban domestic sewage, and can reduce aeration amount and energy consumption, homogenize the concentrations of organic matters in the domestic sewage, slow down the consumption speed of organic matters, improve nitrogen removal efficiency and realize recycling of excess sludge.

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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