Fenton-接触氧化联合工艺处理铁合金镀件电镀前处理废水

电镀前处理废水中含有大量难降解有机物,成分复杂,用传统生化法难以处理达标.本实验采用Fenton 氧化技术对前处理废水进行预处理,再用生物接触氧化技术后续降解COD,使出水中COD达到《电镀污染物排放标准》(GB21900-2008)表3的水质要求.实验采用实际电镀生产废水,COD=300 mg/L,通过芬顿-生物接触氧化因素实验,优化工艺参数,去除率可达到83%以上,COD降到50 mg/L以下.最佳芬顿反应参数为:pH=3.0,COD/H2O2=1.5,Fe2+/H2O2=2,反应时间t=10 min;生物接触氧化法最佳水力停留时间为7 h,进水pH在6~8之间.

Treatment of iron alloy electroplating pretreatment wastewater by Fenton-biological contact oxidation process

Electroplating pretreatment wastewater, which contained large amounts of refractory organic compounds, was too complex to be treated by traditional biochemical technology. Fenton technology, which can reduce the non-biodegradable organic matter and enhance biodegradability of the wastewater, was used as a pretreatment technology, then the biological contact oxidation process was used as a further treatment, that can reduce the COD of effluent to meet electroplating pollutants emission standards. The COD of this wastewater was 300 mg/L in this experiment, which was taken from the actual electroplating production. The COD could be reduced to below 50 mg/L and the COD removal rate was more than 83% under the optimum process conditions. The optimize parameters of Fenton treatment were pH=3.0, COD/H2O2=1.5, Fe2+/H2O2=2, t=10 min. The optimize parameters of biological contact oxidation process were HRT=7 h, pH=6~8.