焦化废水Fenton氧化预处理过程中主要有机污染物的去除

Removal of major organic pollutants in coking wastewater by Fenton oxidation pre-treatment

以焦化废水原水为研究对象,采用Fenton氧化法进行预处理,在考察H2O2用量与反应时间对焦化废水中CODCr、挥发酚去除率影响的基础上,重点分析反应体系中有毒难降解有机物浓度的变化.通过GC-MS分析发现,在反应温度为30℃、H2O2用量为1/2理论量、n(Fe2+)∶n(H2O2)=1∶20的条件下,酚、苯系物、石油烃、含氮杂环有机物和多环芳烃在反应10min时相应的去除率分别达到93.7%、96.2%、92.1%、92.7%和89.2%,此时挥发酚类物质去除率为98.6%,COD去除率为54.4%.结果表明,焦化废水经Fenton氧化预处理不仅能取得较高的CODCr、挥发酚类物质去除率,而且能将其中有毒难降解有机污染物氧化为较易生物降解的醇、醛、酮及有机酸等中间产物,有利于后续生物处理过程.

The effects of H2O2 dosage and reaction time on removal of COD volatile phenols, and especially toxic and refractory organics from coking wastewater by Fenton oxidation were studied. According to GC-MS results, 93.7% of hydroxybenzene, 96.2% of benzene homologues, 92. 1% of petroleum hydrocarbons, 92.7% of nitrogen heterocyclic compounds and 89.2% of PAHs were removed in 10 rain at 30℃ when initial concentration of H2O2 added was half of stoichiometric calculated quantities and Fe^2 ＋/H2O2 mole ratio was 1：20. Under these conditions, 54.4% of COD and 98.6% of volatile phenol were also removed. The toxic and refractory organics were decomposed into simpler organic compounds including alcohols, ketones, aldehydes, and organic acids which can be easily biodegraded.