Sulfur autotrophic short-cut denitrification coupled anaerobic ammonia oxidation denitrification system and method

Abstract

The invention discloses a sulfur autotrophic short-cut denitrification coupled anaerobic ammonia oxidation denitrification system and a sulfur autotrophic short-cut denitrification coupled anaerobic ammonia oxidation denitrification method. The system comprises an anaerobic reactor, a nitrification reactor, a first intermediate water tank, a second intermediate water tank, a sulfur autotrophic short-cut denitrification reactor, an anaerobic ammonia oxidation reactor and a sulfide wastewater storage device. Sewage respectively enters the anaerobic reactor and the nitrification reactor, and is respectively subjected to anaerobic reaction and anaerobic-aerobic reaction; the sewage subjected to aerobic nitrification and sulfide wastewater enter the sulfur autotrophic short-cut denitrificationreactor together, and nitrate nitrogen is reduced into nitrite nitrogen to realize accumulation of nitrite nitrogen; the sewage subjected to short-cut denitrification and the sewage subjected to anaerobic treatment and rich in ammonia nitrogen enter the anaerobic ammonia oxidation reactor together to remove nitrogen. According to the method, stable accumulation of nitrite nitrogen is realized by applying sulfur autotrophic short-cut denitrification, an external carbon source is not needed, the aeration rate is low, the operation control is simple, sulfur in sulfide wastewater can be recycled,and a new method is provided for efficient denitrification of low-C / N domestic sewage.

Description

technical field [0001] The invention belongs to the technical field of low C / N urban sewage treatment, and more specifically relates to a system and method for sulfur autotrophic short-range denitrification coupled with anaerobic ammonium oxidation denitrification. Background technique [0002] There is a common problem of insufficient carbon sources in urban sewage treatment in my country. The traditional biological denitrification process of nitrification and denitrification needs external sources to supplement carbon sources, which not only increases the treatment cost, but also causes excessive COD in the effluent. As an efficient denitrification process, anaerobic ammonium oxidation technology has received more and more attention. Anaerobic ammonium oxidation uses nitrous nitrogen as the electron acceptor to oxidize ammonium nitrogen to generate nitrogen without the addition of external organic carbon sources, saving Energy consumption, and anammox bacteria is a kind of...

AI Technical Summary

Problems solved by technology

For urban sewage with low ammonia nitrogen concentration, the main problem of short-cut nitrification is that the effective inhibition of nitrite oxidizing bacteria (NOB) is difficult to achieve stably, and it is difficult for the system to recover in a short time after the excessive proliferation of NOB leads to the decline of denitrification performance

The accumulation of nitrite nitrogen in short-term denitrification also has the problem that it cannot be realized stably for a long time, and heterotrophic denitrification requires organic electron donors. competition, the organic matter in urban sewage is likely not to provide enough electrons for short-range denitrification

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