GC-MS法分析Fenton法处理焦化废水难降解有机物规律

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

利用Box-Behnken Design(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、[H2O2]/[Fe2+]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H2O2投加量交互影响最为显著。以优化条件pH值为3.60、m(H2O2)∶m(CODcr)为1.95、[Fe2+]/[H2O2]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 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.