Abstract
Laboratory-scale sequencing batch reator (SBR) activated sludge processes were operated using synthetic wastewater to investigate the effects of disturbance (e.g. from anaerobic/aerobic operation to aerobic operation or decrease in the influent etc.) on the population dynamics of bio-P-bacteria in activated sludge ecosystems.
From this research, it is clarified that Q-9 was predominant ubiquinone in activated sludge showing high phosphorus removal ability. The responces of phosphorus removal ability and quinone profile suggested that the deterioration and the slow recovery were dependent not only on the decrease in the activity of each bio-P-bacteria but on the decrease in their population, i.e. species succession of bacteria.
The isolated strain of Pseudomonas was identified to be a bio-P-bacteria for accumulated polyphosphates as well as the strain of Acinetobacter in activated sludge ecosystems. It is suggested that the isolated strains of Acinetobacter and Pseudomonas, which contained major quinone of Q-9, played an important role in phosphorus removal in activated sludge processes.
