An improved dual-sludge phosphorus and nitrogen removal device and process suitable for the treatment of domestic sewage in plateau cities

Abstract

An improved dual-sludge dephosphorization and nitrogen removal device and process suitable for the treatment of domestic sewage in plateau cities belongs to the field of biological treatment of domestic sewage in cities and towns. It is characterized in that it adopts the combination of biofilm method and activated sludge method to form a double sludge system, so as to realize the enhancement of phosphorus and nitrogen removal functions. First, the domestic sewage enters the hypoxic pool and the anaerobic pool at the same time according to a certain proportion: the hypoxic pool is equipped with a combination of fillers, and then enters the anoxic pool to realize partial denitrification through synchronous nitrification and denitrification; in the anaerobic pool, the anaerobic release is completed Phosphorus enters the anoxic pool; in the anoxic pool, the simultaneous removal of nitrogen and phosphorus is completed through denitrification and phosphorus removal. Finally, the aeration tank is mainly used to absorb the remaining phosphorus and remove the remaining ammonia nitrogen. The invention realizes the effective separation of phosphorus accumulating bacteria and nitrifying bacteria, and has the advantages of simple process flow, convenient operation and low sludge output compared with the traditional double-sludge method, and is more suitable for the treatment of domestic sewage in plateau cities.

Description

Technical field [0001] The present invention belongs to the field of biological treatment technology for urban domestic sewage, in particular to an improved double sludge removal and nitrogen removal device and process suitable for the treatment of domestic sewage in highland towns. Background [0002] Tibet is located on the Qinghai-Tibet Plateau, and its social and natural status are extremely important, which has a non-negligible impact on the harmonious, stable, and common prosperity and development of the country and the international community. In recent years, due to economic development and regional development, environmental protection problems in Tibet have become increasingly prominent, especially the urban domestic sewage treatment work is still in its infancy, low temperature and low pressure and low oxygen conditions have a significant impact on the activity of microorganisms, the efficiency of aeration, etc., limiting the operation efficiency of the traditional ac...

AI Technical Summary

Problems solved by technology

[0005] The traditional phosphorus and nitrogen removal process belongs to a single sludge system, and there are some problems in actual operation: ① phosphorus accumulating bacteria and denitrifying bacteria compete for carbon sources in sewage; ② phosphorus accumulating bacteria and nitrifying bacteria are in the same sludge system, There is a contradiction in mud age between the two; ③ In the aerobic tank, the competition for oxygen between heterotrophic aerobic bacteria and nitrifying bacteria leads to the disadvantage of nitrifying bacteria growth

However, the common dual-sludge phosphorus and nitrogen removal process still has defects: on the one hand, there are multiple reflux systems in the process, and the procedure is relatively complicated; , low impact load capacity

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