Experiment Study on Anoxic Phosphate Accumulation with Nitrite
NO2-作为缺氧吸磷电子受体的试验研究

Biological phosphorus removal with nitrite was studied in an Sequencing Batch Reactor. The results showed that nitrite can be used as electron acceptor in denitrifying phosphorus removal. Feed mode of nitrite had significant influence on denitrifying phosphorus removal. Anoxic phosphorus assimilation rate could be reached 10.44 mg/(g x h) and percentage of anoxic phosphorus assimilation amount was more than 97%. Granular sludge with denitrifying phosphorus removal activity was cultivated in an SBR. The effects of different operational conditions on formation of granular were studied such as COD loading, settling time, HRT and so on. The average dimension of granular was 315 microm. Its water content was at 96.78%-98.14%, specific gravity 1.0064-1.016 , SVI of sludge 25 40 mL/g, COD removal loading could be reached to 1 5 kg/(m3 x d), nitrogen and phosphorus removal efficiency was more than 90%.