生物接触氧化法净化微污染原水的机理研究

Research on The Mechanism of Micropollutants Removal in the Raw Water by Biochemistry Purification Process*

在姚江水质为ｐＨ６．８～７．４、浊度９～２０ＮＴＵ、色度２５～３７度、ＮＨ＋４－Ｎ１．０～９．０ｍｇ／Ｌ、ＮＯ－２－Ｎ０．０７５～０．２５ｍｇ／Ｌ和ＣＯＤＭｎ８～１８．９ｍｇ／Ｌ的条件下，进行了生物接触氧化法预处理微污染原水的除污染作用机理研究．结果表明，生化池进水处填料层生物膜厚度为０．３～０．５ｍｍ，出水处填料层膜厚为０．１～０．３ｍｍ，仅为污水处理中普通生物膜厚的１／１０左右．当水中溶解氧控制在７～９ｍｇ／Ｌ时，填料上生物膜全是好气层，无厌氧层存在．生物接触氧化法净水过程是一个高度综合、高度好氧的生物作用过程，包括生物膜吸附，生物絮凝，有机物的生物降解及氨氮的显著硝化等作用．

The mechanism of pollutants removal in pretreating the micropolluted raw water by biological contact oxidation process(BCOP)has been studied under the condition of pH68-74,turbidity 920NTU,colorization 2537 degree,NH+4N1090mg/L,NO-2N 0075025mg/L and CODMn 8189mg/L for raw water in Yao River.The research results show the thickness of the biological membrane on the packing in the water entrance of biological contact oxidation tank is 0305mm and is 0103mm in the water effluence,and is only about 1/10 of that of the ordinary biological membrane in the wastewater treatment.The biological membrane is almost aerobe layer and no anaerobes under the DO 79mg/L of the micropolluted water in the biological contact oxidation tank.This water purification process by BCOP is a highly comprehensive and aerated biological action process,which includes biological adsorption,biological flocculation,biodegradation of organics and notable nitrification of NH3N,etc.The primary bacterium in the biofilm is malnourished aerobes.