苯酚对废水生物硝化过程的抑制

由于硝化细菌对水产养殖水质可以起到明显调节作用，近年来在水产养殖领域的应用日益广泛。但废水中有毒有害物质的存在常常会导致硝化细菌的活性受到严重抑制，从而严重影响养殖水体及水产品的质量。本文利用富集培养的硝化污泥研究了苯酚对生物硝化过程的抑制效应。结果表明，苯酚对氨氮生物硝化过程的抑制属于非竞争性抑制，抑制常数K1和EC50均为2．61mg／L。泥龄相同的条件下，有苯酚抑制剂存在时氨氮的出水浓度高于无抑制情况，且苯酚浓度越高，氨氮出水浓度也越大；而达到相同的氨氮出水浓度，抑制剂存在条件下的泥龄大于无抑制条件，且抑制程度越高，所需泥龄越长。

Study on phenol inhibition on nitrification

Nitrifying bacteria,being obviously helpful to improve water quality, has been widely used in aquiculture in recent years.But the harmful substances in wastewater might seriously inhibit the activity of nitrifying bacteria,and have a strong impact on the quality of water and aquatic products.Phenol inhibition on nitrification with enriched nitrifying bacteria was studied in this paper.The results indicated that the inhibition type of phenol on nitrification was non-competitive.The inhibition constant(KI) was equal to EC50,and both were 2.61 mg/L.The effluent ammonia in the presence of phenol was higher than that of no inhibitor under the condition of the same Sludge retention time(SRT),and the higher the phenol concentration was,the higher the effluent ammonia was.The SRT of nitrifying bacteria in the presence of phenol was longer than that of no inhibitor to achieve the same effluent ammonia,and the higher the phenol concentration was,the longer the SRT was.