Effect of Nitrite on Anaerobic Metabolism of Candidatus Accumulibacter Phosphates

In order to investigate the metabolism of Candidatus Accumulibacter Phosphates(a well-known phosphate accumulating organism) and its affecting factors,anaerobic-aerobic SBR reactor was performed to incubate polyphosphate accumulating organism(PAO) using synthetical sewage,and the content of PAOs reached more than 80%.Based on the enriched culture,several batch experiments were taken.The results indicated that when acetate and nitrite were both in the reactor(in 60min),with the increasing of the initial nitrite,Accumulibacter released much more PO₄^3--P,whereas the acetate uptake rate and the amount of accumulated PHA decreased.After 60min,the concentration of phosphate,nitrate and PHA were all degressive,suggesting that denitrifying phosphorus removal were occurred.The results suggested that there were denitrifying phosphorus organisms.Besides,there were a part of PAOs which could be poisoned by nitrite in this system.