Fenton高级氧化法深度处理焦化生化废水的实验研究

摘要

采用硫酸亚铁和过氧化氢所构成的Fenton试剂，对经生化处理后的焦化废水进行Fenton高级氧化深度处理，重点考察了废水初始pH，FeSO4·7H2O、H2O2及PAM投加量对焦化生化废水处理效果的影响。结果表明，采用Fenton高级氧化法可使经生化处理后的焦化废水中的COD、NH3-N和色度得到进一步有效去除。对于中等浓度的焦化生化废水，较适宜的Fenton氧化工艺条件：废水初始pH为8~10，FeSO4·7H2O投加量为500 mg/L，H2O2投加量为3.5 mL/L，PAM投加量为4.0 mg/L。在此条件下， COD、NH3-N和色度的去除率分别可达85.9%、97.3%和84.6%。%The Fenton reagent used was made from ferrous sulphate and hydrogen peroxide. It is used in the advanced treatment of coking wastewater which was bio-chemically treated. The effects of the initial pH ,and dosages of FeSO4·7H2O,H2O2 and PAM on the treatment effectiveness of the bio-chemically treated coking wastewater have been investigated. The results show that using the advanced Fenton oxidation process can effectively remove the COD,NH3-N and chroma from this kind of coking wastewater. For bio-chemically treated coking wastewater with moderate concentration,the optimum conditions for Fenton oxidation process are as follows:the initial pH of waste-water is 8-10,dosage of FeSO4·7H2O 500 mg/L,dosage of H2O2 3.5 mL/L,and dosage of PAM 4.0 mg/L. Under these conditions,the removing rates of COD,NH3-N and Chroma can reach 85.9%,97.3%and 84.6%,respectively.