Denitrification and dephosphorization efficiencies of an A2/O+sulfur-packed column combined process
A2/O+硫磺填料柱组合工艺脱氮除磷的效果

An integrated process,in which a sulfur-packed column for TN & TP further treatment was installed after an A2/O process and influent of a municipal sewage treatment plant was used,was applied to improve the incompetent denitrification and dephosphorization efficiencies.With effluent conventionally and periodically analyzed,the process ran continuously for 55 days after the quality of effluent had become stable.The results show that denitrification efficiency was largely improved by a sulfur-packed column,while COD removal efficiency practically staying the same.Mean COD removal efficiency of the effluent from improved A2/O process was 94%,with TN and TP removal efficiencies of 60%,57.4%,respectively.Further processed by a sulfur-packed column,mean concentration of TN could be decreased with removal efficiency enhancing to 84%.Similarly,mean concentration of TP was decreased with removal efficiency enhancing to 69.8%.However,COD removal efficiency was scarcely enhanced to 95.3%.