焦化废水泡沫分离液的Fenton催化氧化预处理

Pretreatment of the foaming wastewater from coking wastewater station by Fenton oxidation

以焦化废水处理过程产生的泡沫分离液为研究对象,对其进行Fenton催化氧化处理实验,考察H2O2用量、Fe2+浓度、pH和反应时间4个因素对处理效果的影响,并结合GC/MS方法比较处理前后泡沫分离液中有机物的种类及其生物降解性的变化。结果表明,采用[H2O2]=100 mmol/L、[Fe2+]=100 mg/L、pH=3、反应时间为30 m in的Fenton催化氧化反应条件,可以使分离液的COD去除率达到68%以上;经Fenton处理后,分离液的B/C值由0.12提高至0.38,生物降解性明显改善;通过GC/MS的分析,基本明确分离液中含有的有机物主要为酚、胺、腈、酯类有机物及喹啉、吡啶等杂环化合物,大多数属于难降解且生物毒性较强的有机物。针对这些复杂组分共存的泡沫分离液,利用Fenton试剂较强的氧化能力能够将其含有的有毒/难降解有机物转化为低毒或无毒的小分子有机物,为其后续的生物处理创造良好的条件。

The foaming wastewater from coking wastewater station was studied.It was treated by Fenton oxidation technology.The effects of H2O2 dosage,Fe2＋ concentration,pH and reaction time on the process were reviewed.The biodegradability was compared through biodegradation experiment and organic compounds in the foaming wastewater analyzed by GC/MS method.The results indicated that COD removal rate of the foaming wastewater could reach 68% when =100 mmol/L,=100 mg/L,pH=3 and the reaction time 30 min.The B/C value was increased from 0. 12 to 0. 38 after Fenton oxidation. The foaming wastewater contained kinds of organic pollutants, such as phenols, anilines, nitriles, esters, quinoline, pyridine and so on. Most of the pollutants belonged to non-biodegradable compounds and presented high toxicity. Fenton reagent had strong ability for oxidizing the hard-biodegradable compounds and could turn them into low-toxic or nontoxic products with small molecular structure. Therefore, Fenton oxidation process could create a better environment for the post-treatment of foaming wastewater.