Study on the Mechanism of the Denitrifying Phosphorus Removal System with Nitrite as Electron Acceptor

The SBR nitrosation experimental equipment was established to investigate the performance of the nitrite as electron acceptor on removal of phosphorous in nitrosation denitrifying phosphorus removal(NDPR) system.The different concentrations of nitrite were used to cultivate and domesticate the denitrifying phosphorus removal system.With different concentrations of nitrite denitrification rate and denitrifying phosphorus absorption rate in denitrifying phosphorus removal system were investigated.In the range of suitable concentration of NO2-N and NO2-N,both of them could become electron acceptor in DPB and result in good denitrifying phosphorus removal after a long time of domestication.When the concentration was less than 15 mg / L,the consumption of NO2-N and denitrification rate increased with the increase of initial concentration of NO2-N;when the concentration was more than 15 mg / L,the consumption of NO2-N and denitrification rate decreased with the increase of initial concentration of NO2-N;when the concentration was at 15 mg / L,the denitrification rate of NO2-N become significantly lower,and the consumption of NO2-N showed a certain value.This phenomenon indicated the denitrification was inhibited when the concentration of electron acceptor was more than 15 mg / L.The Phosphorus release rate and phosphorus uptake increased significantly when the concentration of NO2-N was 5 mg / L to 15 mg / L.when the concentration of NO2 N was more than 15 mg / L,the phosphorus release rate and phosphorus uptake decreased with the increase of the concentration of NO2-N and got the best effect at the concentration of 15 mg / L,which showed a similar performance of study on denitrification.There was a good linear relationship between the aerobic phosphorus uptake and anaerobic phosphorus release amount.The straight line equation was imitated by y = 0.580 6 + 1.697 4x,which showed a linear correlation between the two processes.