摘要
硝基苯是一种重要的化工原料,广泛应用于医药、农药等领域。硝基苯生产废水毒性大,COD值高,其中大部分都是生物难以降解的污染物质,一般不能直接进入生化系统进行处理,需对废水进行物化预处理后再进行生物处理[1]。Fe-C微电解与Fenton氧化具有较高的氧化还原能力,是处理高浓度有机废水的较好方法,近十年来在工业废水预处理方面被广泛运用[2]。Fenton试剂对难降解有机物的处理效果好,但需投加Fe2+与H2O2,成本较高。若将两种方法结合起来运用,微电解反应产生的Fe2+提供给后续的Fenton氧化使用,可降低运行成本,又可达到较高的处理效果。本文采用Fe-C微电解与Fenton氧化组合工艺处理江苏某化工厂硝基苯生产废水,取得较好效果。COD去除率达到80%,硝基苯类(NB)与苯胺类物质去除率超过90%,BOD5/COD的比值由原来的0.2提高至0.45,大大提高了废水的可生化性,保证了废水对后续生化处理不产生毒害。
Iron powder is applied in nitrobenzene wastewater treatment for reducing nitrobenzene in wastewater to phenylamine. Afterwards, H2O2 is added to the water and H2O2 combined with Fe2+ forms Fenton reagent. The ·OH free radicals from the reaction are strong oxidants and capable of opening benzene ring of phenylamine and nitrobenzene for further mineralization and breakdown. The experimental results show that, when pH value is 2.5, the time consumed by iron-carbon micro-electrolysis is 2.5h, the concentration of required H2O2 is 1%, the removal rate of TOC and nitrobenzene in wastewater is 82% and 95% respectively, and the B/C is improved from 0.2 to 0.45.
出处
《精细与专用化学品》
CAS
2009年第15期26-28,共3页
Fine and Specialty Chemicals
基金
江苏省环保专项基金:化工园区与大型化工企业有机毒物控制关键技术及应用(编号:2007015)
江苏省重大成果转化基金:有机化工废水治理与资源化关键技术及设备(编号:BA2006013)
