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采用混凝-非均相Fenton氧化工艺处理铅锌选矿废水,研究了不同工艺条件下废水的处理效果。结果表明,pH为7、聚合硫酸铁与聚丙烯酰胺的用量分别为30、1.5 mg/L时混凝效果最好;在H_2O_2和催化剂用量均为0.8 g/L、p H为2时,非均相Fenton氧化效果最好,且催化剂重复使用性能良好。经混凝-非均相Fenton氧化工艺处理后,出水中SS、Pb~(2+)质量浓度为26、0.28 mg/L,COD为、37.10,去除率分别达到85.47%、98.77%和85.58%,出水水质满足GB 25466-2010中的直接排放标准。分析表明,羟基自由基在非均相Fenton降解有机物的过程中起主要作用。
The coagulation-heterogeneous Fenton oxidation process was used to treat lead-zinc dressing wastewater, and the treatment effect of wastewater under different process conditions was studied. The results showed that the coagulation effect was best when the pH was 7 and the dosage of polyferric sulfate and polyacrylamide were 30 and 1.5 mg / L, respectively. When H 2 O 2 and catalyst were both 0.8 g / L and p H was 2, The homogeneous Fenton oxidation has the best effect and the catalyst has good reusability. After the coagulation-heterogeneous Fenton oxidation process, the concentration of SS and Pb 2+ in the effluent was 26, 0.28 mg / L and COD was 37.10, the removal rates reached 85.47%, 98.77% and 85.58% respectively, , Effluent quality to meet the direct emission standards GB 25466-2010. The analysis shows that the hydroxyl radical plays a major role in the heterogeneous Fenton degradation of organic compounds.