低碳氮比实际生活污水A2O-BAF工艺低温脱氮除磷

在低温条件下,采用A2O-BAF工艺处理低碳氮比实际生活污水.结果表明,该双污泥工艺在平均温度为14.2℃、平均进水COD 369.5mg/L、TN 76.8mg/L即C/N为4.81的工况下可以实现深度脱氮除磷.平均出水TN与TP分别为13.21mg/L和0.23mg/L.其中COD、氨氮、TP和TN的去除率分别为86.2%、99.8%、96.6%、81.5%,达到国家污水处理一级A标准(GB18918-2002).低温下A2O工艺段活性污泥的平均SVI为85.4mL/g,污泥具有良好的沉降性能.此外试验过程中可以利用pH值和氧化还原电位值作为该系统A2O各反应阶段的控制参数,来间接的指示A2O各区的反应情况.

Biological nutrients removal from domestic wastewater with low carbon-to-nitrogen ratio in A2O-BAF system at low temperature

Operational performance of A2O-BAF was investigated when treating domestic wastewater with low carbon-to-nitrogen ratio at low temperature. Under the condition of average temperature of 14.2℃ and carbon-to-nitrogen radio of 4.81, enhanced nitrogen and phosphorus removal was achieved. Average effluent total nitrogen and total phosphorus concentrations were 13.21mg/L and 0.23mg/L, respectively. The removal efficiencies of COD, ammonium nitrogen, total nitrogen and total phosphorus were 86.2%, 99.8%, 96.6% and 81.5%, respectively. The effluent quality could satisfy the first level A criteria specified in the discharge standard of pollutants for municipal wastewater treatment plant (GB18918-2002). Although the system was operated under low temperature, good settle ability with SVI of 85.4 mL/g was obtained. Moreover, pH and oxidation reduction potential could be used as control parameters for process control of A2O-BAF system. It was suggested that the operational state could be well known according to the changes of simple online sensors.