Advance of Research on the Technology of Nitrite-denitrifying Phosphorus Removal

With nitrogen and phosphorus in water body caused the environmental problem,removal of the nitrogen and phosphorus in water body with low cost has become a challenge to the biological wastewater treatment worldwide. The technology of nitrite-denitrifying phosphorus removal has advantages of reducing carbon source consumption,saving occupied area,improving water treatment equipment utilization,and decreasing sludge production. But it remains unclear about the cognition of phosphorus accumulating organisms( PAOs),and the stable operation of the whole technology that ammonia is reduced to nitrite and denitrifying phosphorus removal is not reported at present. Simultaneously,according to different researchers,PAOs has different classification,while the main results of the mechanism with short-cut denitrifying phosphorus removal are phosphate release and storage energy in anaerobic,then the energy supply for denitrifying phosphorus uptake with nitrite as the electron acceptor in anoxic. The effect of nitrogen and phosphorus removal is influenced by temperature,p H,the kind of carbon source,the value of ρ( C) / ρ( P) and other factors,so,in order to achieve the stable and efficient treatment of sewage wastewater,the reaction conditions of short-cut denitrifying phosphorus removal is necessarily reasonable.It is necessary to summerize the relevant research reported on the nitrite-denitrification and phosphorus removal to guide and overcome the disadvantages of the biological nitrogen and phosphorus removal.