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采用Fenton法对某合成制药废水进行了预处理试验研究,考察H2O2、Fe2+投加量及反应时间对废水CODCr、色度、NH4+-N去除效果的影响,重点分析了反应体系中有毒难降解有机污染物的变化情况。结果表明,当H2O2(30%)投加量为2%(体积分数),FeSO4.7H2O投加量为400mg/L,反应时间为60min时,废水CODCr、色度的去除率分别为67.73%和40.05%。通过GC-MS分析发现,该废水中含有多种脂类和苯环类等难降解有机污染物质,Fenton反应过程中出现了醇、酯、有机酸等较易降解的中间产物,随着反应的进行废水中苯环类、脂类等大分子有毒有机物得到大幅削减,废水的生物毒性大大降低,BOD/COD值由0.18上升至0.48,可生化性明显提高。
Fenton method was used to pretreat a synthetic pharmaceutical wastewater. The effects of H2O2 and Fe2 + dosage and reaction time on the removal of CODCr, chroma and NH4 + -N in wastewater were investigated. The effects of toxic and refractory organic compounds Changes in pollutants. The results showed that when the dosage of H2O2 (30%) was 2% (volume fraction), the dosage of FeSO4.7H2O was 400mg / L and the reaction time was 60min, the removal rates of CODCr and color of wastewater were 67.73% and 40.05%. By GC-MS analysis, it was found that the wastewater contained many kinds of lipids and benzene rings and other refractory organic pollutants. During the Fenton reaction, more easily degradable intermediates such as alcohols, esters and organic acids appeared. With the reaction In the wastewater, the toxic organic compounds of benzene ring, lipid and other macromolecules were greatly reduced, the biological toxicity of wastewater was greatly reduced, the BOD / COD value increased from 0.18 to 0.48, and the biodegradability was obviously improved.