Community structures and population dynamics of “Candidatus Accumulibacter” in activated sludges of wastewater treatment plants using ppk1 as phylogenetic marker

Candidatus Accumulibacter abundance in the anaerobic-anoxic-oxic (A2O) process was the highest (26% of total bacteria). Type-II was the dominant Accumulibacter in all processes, and type-I accounted for a small proportion of Accumulibacter. The abundance of Clade-IIC as the most dominant clade reached 2.59 × 109 cells/gMLSS and accounted for 87.3% of total Accumulibacter. Clade IIC mainly contributed to denitrifying P removal.141