高浓度焦化废水的预氧化-混凝处理研究

焦化废水成分十分复杂,污染物浓度高,性质非常稳定且水量大,是典型的难降解有机废水。使用H2O2为氧化剂,FeSO4.7H2O为催化剂的Fenton氧化法对钢铁焦化厂废水的终冷水进行了试验研究,氧化处理后用FeCl3为混凝剂对COD,NH3-N,色度及浊度的去除率进行了系统的考查。确定了氧化反应的影响因素和最佳的混凝实验条件。结果表明:当pH值控制在3左右,反应时间为30 min,反应温度为80℃,焦化废水的COD,NH3-N,浊度和色度去除率分别达到了93.1%,96.2%,90.8%和90.2%。

Treatment of high concentration coking wastewater with proxidation-coagulation process

With high concentration of contaminants,stable characters and high water quantity,coking wastewater is complicated and difficult to be treated.Taking H_2O_2 as oxidant,FeSO_4·7H_2O as catalyst,Fenton oxidation method was used to treat final cold wastewater from steel coking plants.After oxidation,FeC1_3 was used as coagulant,and the removal rates of COD,NH_3-N,colority and turbidity by FeC1_3 were studied.The influencing factors and optimum coagulation conditions were investigated.The results showed that the removal rates of COD,NH_3-N,turbidity and colority could reach 93.1%,96.2 %,90.8 % and 90.2 % respectively under the conditions of pH=3,oxidation time=30?min,and temperature=80℃.