Activated sludge-biomembrane combined circulating flow denitrification and desophorization integrated sewage treatment device and method

Abstract

The invention provides an activated sludge-biomembrane combined circulating flow denitrification and desophorization integrated sewage treatment device and a method. The integrated sewage treatment device consists of an improved CASS (Cyclic Activated Sludge System) reactor and a chemical dephosphorizing pond, wherein the inner ring of the improved CASS reactor is served as an anaerobic region, the outer ring is provided with an anoxic region and an aerobic region hung with biomembranes alternately, and the impact load resistance capability of the improved CASS reactor is increased through the flow state combined by a pushing flow and a mixed flow. The integrative sewage treatment device is only provided with an aeration device on the outer aerobic region, an anoxic region or even an anaerobic region is arranged after the aerobic region because the concentration of dissolved oxygen changes from high to low at the downstream of the aeration device, therefore, denitrifying bacteria can directly utilize nitration products to denitrify, and promote nitrification and denitrification to simultaneously generate in the device. The impact load resistance capability of the reactor can be strengthened through the biomembranes arranged alternately, a bidirectional sludge underwater plug-flow device is utilized to prevent the biomembranes to block circulating sludge, the simultaneous occurrence of nitrification and denitrification reactions in the reactor is beneficial to reducing aeration amount and energy consumption, and the volume of the reactor can be reduced because of dispensing with an anoxic pool and a secondary sedimentation tank, thereby saving construction cost and operation cost. The integrated sewage treatment device is suitable for sewage treatment in small towns with insufficient funds.

Description

technical field [0001] The invention relates to a sewage biological treatment method, and relates to an integrated sewage treatment technology with simultaneous phosphorus and nitrogen removal and strong resistance to water quality and water impact loads, and is suitable for simultaneous phosphorus and nitrogen removal of sewage in small cities and towns. Background technique [0002] With the acceleration of urbanization in my country, more and more nitrogen and phosphorus nutrients are discharged into the water body, coupled with farmland runoff, etc., the eutrophication of the water body is becoming more and more serious, and the removal of plant nutrients such as nitrogen and phosphorus has become a necessity for urban sewage treatment. Task. The main characteristics of sewage in small towns in my country are the regularity of sewage discharge and the large fluctuations in water quality and quantity, and the water quantity is generally 0.5×10 4 ~3.0×10 4 m 3 / d range; ...

AI Technical Summary

Problems solved by technology

In the presence of nitrate in the anaerobic stage, denitrifying bacteria will compete with phosphorus accumulating bacteria for organic matter in sewage, and use these organic substrates for denitrification in preference to phosphorus accumulating bacteria; the presence of nitrate will also be used by some phosphorus accumulating bacteria as electron acceptors. body for denitrification, thereby affecting its fermentative acid production on organic matter

As a result, phosphorus accumulating bacteria cannot obtain enough volatile fatty acids (VFAs), thereby inhibiting the anaerobic phosphorus release and PHB (poly-β-hydroxybutyrate) synthesis ability of phosphorus accumulating bacteria, and then affecting the pho

Images