Taking a certain coking plant in Shanxi Province as the example, this paper introduces the application of A2/O biological denitrification process in its wastewater processing station, and briefly expounds the debugging and operation of the coking wastewater treatment and the control of main technological parameters.

with the A2/O process,a pilot test system for enhancing biological nitrogen and phosphorus removal by using the A2/O-membrane bioreactor(A2/O-MBR)was constructed and used to treat municipal wastewater.

Tests on biological nitrogen and phosphorus removal by a spiral up-flow reactor (SUFR) system were described in this paper.

The current research results and progress on the mechanism of biological nitrogen and phosphorus removal from municipal sewage from home and abroad were reviewed.

General situation studying on new technology of biological nutrient removal is summarized,such as the principle of denitrifying dephosphataion and factors affecting it,such as pH,DO,SRT,MLSS etc.

It is a focal problem in conventional biological nutrient removal that denitrifying bacteria compete with phosphate accumulating organisms(PAO) for limited dissolved organisms.

This thesis examined the feasibility of using fermentative Short-chain Fatty Acids (SCFA, which was produced from waste activated sludge affected by surfactant) as the carbon sources of biological nutrient removal (BNR) system, Which has been focused in the research of the metabolic mechanism of nitrogen, phosphorus, SCFA, polyhydroxyalkanoates (PHAs), glycogen et al.