GC—MS法分析Fenton法处理焦化废水难降解有机物规律

利用Box-BehnkenDesign（BBD）的响应面分析方法（RsM），对Fenton试剂法处理焦化废水4个主要因素：初始pH、H2O2用量、EH2O2]／Fe^2＋]摩尔比及反应时间的交互影响进行了分析，得到二次响应曲面模型，表明COD的去除率与各因素存在显著的相关性，以Fe2＋]：H2O2。]（摩尔比）和Hzoz投加量交互影响最为显著。以优化条件pH值为3．60、m（H2O2）：re（CODcr）为1．95、Fe2＋]／EH2O2]摩尔比为1：7．43、反应时间30．8min，分别处理原水、缺氧池出水、二沉池出水，COD去除率达到44．60％、47．30％、56．59％．GC—MS分析Fenton氧化法处理前后水样，表明Fenton体系中产生大量的·OH自由基，主要对焦化废水中的挥发酚类和含氮杂环化合物类污染物苯环上的c—c键进行攻击后断裂，降解产物以石油烃类为主及部分的酯类、醇类等．好氧工艺和Fenton法对挥发酚类去除效果显著．

The degradation rule of the refractory organics in coking wastewater by the GC-MS analysis method

The reciprocal effects of initial pH, H2 O2 dosage, H2O2 ]/Fez＋] molar ratio and reaction time on the coking wastewater treatment by Fenton＇s reagent were investigated by the response surface analy- sis methods （RSM） of Box-Behnken Design （BBD）. The simulation results by quadratic response surface model showed that the interaction influence of Fe2＋]/H2O2-] （molar ratio） and H2O2 dosage are the most significant factors. The percent COD removal of the raw wastewater, the effluent of aerobic tank and secondary sedimentation tank are 44.60%, 47. 30%, 56.59%, respectively under optimal conditions that pH of 3.60,m（H2O2）/m（CODcr） of 1.95, Fe2＋]/H202] of 1/7.43 and reaction time of 30.8 min. A great amount of · OH radicals produced due to Fenton＇s oxidation by the analysis GC-MS method attacked the C-C bond on the benzene ring of volatile phenol and nitrogen heterocyclic compounds pollutants in coking wastewater. The degradation products were mainly petroleum hydrocarbon-based and some of the esters, alcohols, etc. The results indicated the volatile phenols could be removed significantly by aerobic process and the Fenton method.