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Demonstration work of inter-cycle biological contact oxidation process for purification of Daqing River in Dianchi Lake watershed

Zhang Hui Wen Donghui Li Lu Xie Shuguang(College of Environmental Sciences and Engineering,Peking University,Beijing 100871)  
Daqing River is the most seriously polluted river in the Dianchi Lake watershed.A bypass demonstration work of the inter-cycle biological contact oxidation process(IBCOP),with the treatment scale of 1000 m3/d and the HRT of 4.75 h,was built around the river bank to purify the river water.During the winter dry season from Nov.2007 to Apr.2008,three sets of conditions of the demonstration work were operated by regulating cycling ratio based on the influent qualities and climatic conditions.The results showed that the IBCOP demonstration work kept better removal efficiencies for COD and NH+4-N,and the average removal rates were 46.8% and 48.8% respectively.The higher cycling ratio(150%) was favorable for removal of NH+4-N.The average removal rate of TN was lower as 10.2%,owing to the negative impacts of low temperature,carbon source shortage,higher DO level of the influent,and loose and porous biofilm,regulating cycling ratio could not improve the condition of carbon source shortage remarkably.The absorption by Spirogyra sp.and deposition of sludge were the main causes of TP removal and the average removal rate of TP was 17.9%,low TP concentration of influent,detachment of biofilm and higher cycling ratio were detrimental for TP removal.
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