10.2190/ES.33.2.d EK1W1084015632G1 4 Effect of Tertiary Treatment on Chemically Complex Secondary Wastewater 121 131 20120409 20120409 20120409 20120409 EK1W1084015632G1.pdf http://baywood.metapress.com/link.asp?target=contribution&id=EK1W1084015632G1 2 Liu Jingming Chen Yanyan Zhang Wei Shi Yunfen Zhu Zhirong Northeast Dianli University, China and Tongji University, China Northeast Dianli University, China Tongji University, China Biochemical characteristics of chemical secondary effluent in tertiary treatment were studied with a piloted system of biological contact aerators to meet national discharge limits. The results showed that biochemical characteristics of the secondary effluent had higher concentrations of residual COD and NH₃-N, as well as lower residual concentrations of BOD₅ and alkalinity. 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