A2N-IC新工艺与A2N工艺脱氮除磷性能对比研究

为了实现污水中磷的高效去除和磷资源回收,将化学除磷技术与双污泥反硝化聚磷工艺(Anaerobic/Anoxic/Nitration,A2N)结合,开发了新型双污泥反硝化聚磷诱导结晶磷回收工艺(Anaerobic/Anoxic/Nitration-Induced Crystallization process,A2N-IC),并比较了A2N-IC工艺和A2N工艺的脱氮除磷性能.结果表明:在进水总磷(Total Phos-phorus,TP)浓度为5.22～8.31mg/L的情况下,A2N,A2N-IC工艺TP去除率分别为87.4%,99.6%,A2N-IC除磷效率和稳定性明显优于A2N工艺.2种工艺对氨氮的去除效果基本相同,分别为84.8%,84.4%.A2N-IC工艺中化学除磷对生物除磷的辅助是保证该工艺稳定高效运行的主要原因.A2N-IC工艺结晶柱中的主要产物为羟基磷酸钙,鸟粪石在结晶柱中难以形成.

Comparison of Nitrogen and Phosphorus Removal in A2N and A2N-IC Processes

To realize effective nitrogen and phosphorus removal and phosphorus recycle,a new system combining chemical phosphorus removal technology and anaerobic / anoxic / nitration(A 2 N) process was proposed.Experiments were done to compare the characteristics of nitrogen and phosphorus removal in A 2 N and A 2 N-induced crystallization(A 2 N-IC) processes.The results showed that,when the influent total phosphorus(TP) concentrations were 5.22～8.31mg / L-1,the TP removal efficiencies of the A 2 N process and A 2 N-IC process were 87.4%and 99.6%,respectively.The TP removal efficiency and the stability of A2N-IC process were obviously better than that of A2N process.The ammonia removal efficiencies were 84.8%and 84.4%,and they were nearly the same.The main reason for the high stability and TP removal efficiency in the A2N-IC process was that chemical phosphorus removal provided assistance to the biological phosphorus removal.The product in the induced crystallization reactor was hydroxyapatite.Magnesium ammonium phosphate precipitation could not be formed.