Efficient sewage denitrification process

Abstract

The invention discloses an efficient sewage denitrification process which comprises the following steps: converting a part of ammonia in ammonia-containing sewage into nitrite by aerobic nitrifying bacteria in an aerobic tank; introducing sewage treated in the aerobic tank into an anaerobic tank; and converting ammonia and nitrite into nitrogen by anaerobic ammonium oxidizing bacteria in an anaerobic tank. The invention has the beneficial effects that the solution converts a part of ammonia into nitrite by aerobic nitrifying bacteria and then converts the remaining ammonia and nitrite into nitrogen by the anaerobic ammonium oxidizing bacteria, compared with a traditional treatment method, when treating the same amount of sewage, the solution takes less time for nitrification in the aerobictank, consumes less oxygen, and can reduce energy consumption of aeration, shorten process time and reduce construction and use costs of the aerobic tank; the anaerobic ammonium oxidizing bacteria can be used for simultaneously treating ammonia and nitrite so as to improve denitrification efficiency at an anaerobic stage, thereby shortening the time for the entire denitrification process.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to an efficient sewage denitrification process. Background technique [0002] The "China Environmental Statistical Annual Report" shows that among the top 10 river basins in the country, except for the Songhua River Basin and the Southwest Rivers, ammonia nitrogen has surpassed COD to become the main pollutant causing water quality to exceed the standard, especially in the Yangtze River, Yellow River, Haihe River and Northwest Rivers. It can be seen that ammonia nitrogen has become the top priority of sewage treatment in my country. The poor denitrification effect makes the total nitrogen content seriously exceed the discharge standard limit. After this sewage is discharged into natural water bodies, it will provide a large amount of nutrients to algae, causing a large number of algae and other plankton to grow and reproduce in the water. The concentration of dissolved oxygen in the w...

AI Technical Summary

Problems solved by technology

However, most of the research on short-cut nitrification and denitrification at home and abroad is still in the stage of small-scale research. For actual sewage treatment plants, short-cut nitrification and denitrification can only be realized by changing the operating parameters without changing the structure. Aspects of reports

Therefore, short-cut nitrification and denitrification cannot be applied to large-scale sewage treatment plants in a short period of time.

[0011] To sum up, the traditional biological denitrification process of sewage has limited denitrification effect and is easily affected by environmental factors. The denitrification requires sufficient organic carbon source and the cost is high; while the new biological denitrification process is generally immature, and its process conditions are difficult to control , the effect in engineering application is unstable, the limitation is relatively large, and it is not suitable for large-scale engineering application

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