Abstract
Laboratory-scale sequencing batch reator (SBR) activated sludge processes were operated using synhtetic wastewater to clarify the effects of solids retention time (SRT) and organic substrates on the accumulation of bio-P-bacteria.
The accumulation of bio-P-bacteria could be enhanced by large fluctuation in concentration of organic substances in the reactor by filling in a short period of time under anaerobic condition. However, the accumulation could not be enhanced in the reactor operated with SRT less than 25 d. The specific growth rate (μ) of bio-P-bacteria were estimated to range from 0.033d-1 to 0.035 d-1 in the SBR activated sludge processes fed with glucose and polypeptone (GP). Therefore, large solids retention time (SRT) would be necessary for the accumulation of bio-P-bacteria. Volatile fatty acids (VFA), such as sodium acetate (A), enhanced in-situ specific growth rate of bio-P-bacteria and seemed to be effective than other organic substates (ex: GP) for the accumulation of bio-P-bacteria in activated sludge ecosystem.
