中文摘要：

利用Fe2（SO4）3作为混凝剂,对焦化废水生化处理出水进行深度处理,考察pH值和投加量对混凝过程的影响,从而分析不同条件下有机物的去除机理.结果表明,在pH3～9的条件下,混凝对生化出水中的有机物均能取得较好去除效果.弱酸性条件有利于有机物的去除,在Fe2（SO4）3投加量为400mg/L、pH5的条件下,DOC去除率达到40.1%,出水COD〈150mg/L.络合沉降、络合吸附和吸附是混凝过程中有机物的主要去除机理,但在不同pH值条件下,三者作用程度不同.混凝过程主要去除生化出水中的中等分子量、疏水性有机物,对亲水性有机物几乎没有作用.

英文摘要：

Advanced treatment of biological effluent from coking wastewater treatment system （A/O process） was studied by coagulation with Fe2（SO4）3. The effect of pH and dosage was investigated and then the removal mechanism of organic compounds was studied. Organic compounds could be removed effectively at pH of 3-9. Furthermore, high removal efficiency could be achieved tinder weakly acid condition. The removal efficiency of DOC was 40.1% and the effluent COD was less than 150mg/L at dosage of 400mg/L and at pH of 5. Complexation-precipitation, complexation-adsorption, and adsorption were the main mechanisms for organic compounds removal in the coagulation process. Under different pH conditions, these three mechanisms had different contribution to the removal of organic compounds. Coagulation effectively removed the hydrophobic organic compounds and those compounds with medium molecular weight, whereas, the hydrophilic organic compounds was poorly removed.