Effects of Nitrite on Phosphorus Uptake in Anaerobic/Oxic Process
亚硝酸盐对聚磷菌吸磷效果的影响

Intermediate products of biological nitrogen removal process,nitrate and nitrite,could be used as electron acceptors for phosphorus removal.This study investigated the effects of nitrite on phosphorus uptake in anaerobic/oxic(A/O) biological phosphorus removal process.The results indicated that in addition to oxygen and nitrate(DPBNa,Denitrifying Phosphorus removal Bacteria with nitrate as electron acceptor),to some extent,nitrite can also serve as electron acceptor to achieve the nitrite denitrifying phosphorus removal(DPBNi).The quantity and rate of phosphorus uptake of DPBNi,however,were evidently lower than that of DPBNa.The nitrite existed in anoxic reactor made no difference to the quantity and rate of denitrifying phosphorus removal.But it would reduce the consumption of nitrate.Moreover,the data showed that the aerobic phosphate uptake of DPBNi was lower than that of anaerobic phosphorus-released sludge in traditional A/O process.However,there was no much difference between these two kinds of sludge in terms of the total phosphorus uptake quantity and the effluent quality.