A study on characteristics of bialogical phosphorus removal in alternation of aerobic/anaerobic process
厌-好氧交替工艺的生物除磷特性研究

This paper describes the phosphorus (P) and COD removal characteristics in alternation of aerobic/anaerobic (AAA process) using synthetic domestic wastewater as feed. It is shown that through the cultivation and operation of the technology, the influent P concentration of 9 84-13 57mg/L can reduce to about 1mg/L of effluent at the 4 th stage, P-removal efficiencies reach more than 90%. The influent COD of 372.548 mg/L decreases to 20.50 mg/L of effluent,total COD removal efficiency is higher than 90%. The proportion of COD removal in anaerobic operation period is 16.7%-33.4%,and 54.9%-75.6% in aerobic operation period.This indicates that the degradation of COD mainly occurs in aerobic period.These good operational properties of AAA process are attributed to the formation and cultivation of granular activated sludge in the reactor,which is first reported.It is unnecessary to add any external carbon source for operation.The reactor can effectively metabolize organic matters and conversion of phosphorus,and only uses half aeration of the conventional technology.It implies that AAA process is a good potential treatment process both in P removal and COD degradation.