摇动床生物膜新技术处理废水的研究

利用摇动床具有的容积负荷高与污泥产量低等优点,日本NET株式会社开发了摇动床生物膜新技术.试验结果,摇动床生物膜新技术具有高效处理有机废水和污泥减量的显著特性.最高COD容积负荷2.4 kg/m3.d时,COD去除率为97%;进水最高COD浓度2551 mg/L时,出水COD浓度为83 mg/L.进水平均COD浓度1 182 mg/L时,平均NH4+-N去除率为99.4%,具有较强的硝化能力.此外,摇动床反应器中形成了"细菌-原生动物-后生动物"的较长食物链,有利于污泥减量,运行过程中污泥产率为0.194,仅为普通活性污泥法的50%左右.

Study on the novel wastewater treatment technique using swimming-bed biofilm

Based on the swimming bed＇s advantages of the high volumetric load and low sludge yield, the swimming bed biofilm technique was developed by NET Corporation in Japan. The experiment results showed remarkable characteristics of the high treatment efficiency and sludge reduction when treating the organic wastewater by the new technique. The COD removal rate of the effluent reached 97% when the highest volumetric load of COD was 2.4 kg/m3. d and the COD concentration of output effluent was 83 mg/L when COD concentration of input influent was 2 551 mg/L. The technique had high nitrification ability that the average NH4＋ -N removal rate reached 99.4% when the average COD concentration of input influent was 1 182 mg/L. In addition, the longer food chain of bacteria, protozoan, and metazoan was developed in the reactor,which was advantageous for the sludge reduction. The sludge productive rate was 0. 194 that was only about 50% of the ordinary sludge.