微电解-Fenton深度处理制药废水影响因素与参数控制

Influencing factors and parameters control on advanced treatment of pharmaceutical wastewater by micro-electrolysis-Fenton process

采用铁炭微电解-Fenton联合工艺深度处理制药废水生化出水,探讨了初始pH、曝气量、反应时间等因素对微电解出水Fe2+和Fe3+变化规律、COD降解速率以及后续Fenton氧化效果的影响,为优化微电解-Fenton氧化联合工艺提出了微电解间歇加酸的理论。间歇加酸可提高微电解系统中COD降解速率和Fe2+含量,使后续Fenton氧化无需投加FeSO4·7H2O即可达到较好的COD去除效果。结果表明,当初始pH=2.5,曝气量为0.6 m3/h,间歇加酸30 min/次,微电解反应2 h,出水投加1 mL/L的H2O2进行Fenton氧化2 h,COD总去除率可达81.33%;间歇加酸30 min/次可将微电解反应2 h出水Fe2+浓度从50 mg/L提高至151 mg/L,COD降解速率从10.6 mg COD/(L·h)提高至22.2 mg COD/(L·h)。

Advanced treatment of pharmaceutical wastewater biochemical effluent was studied by using ferric-carbon micro-electrolysis-Fenton combined process. Effects of initial pH,aeration rate and reaction time of micro-electrolysis on effluent Fe2＋ and Fe3＋ concentration variation,COD degradation rate and subsequent Fenton oxidation process were discussed. Theory of adding sulfuric acid intermittently was proposed in order to optimize the combined process of micro-electrolysis-Fenton oxidation. Degradation rate of COD and Fe2＋ concentration were improved by adding sulfuric acid intermittently to micro-electrolysis system,that got better COD removal rate of Fenton oxidation without adding FeSO4·7H2O. The results showed that,when initial pH = 2. 5,aeration rate was 0. 6 m3/ h,adding sulfuric acid was 30 min/time,micro-electrolysis reaction was 2 h,Fenton oxidation was2 h by adding 1 mL/L H2O2,the effluent COD removal rate achieved 81. 33%. Adding sulfuric acid 30 min/time to micro-electrolysis system could increase effluent Fe2＋ concentration from 50 mg/L to 151 mg/L,COD degradation rate from 10. 6 mg COD /（ L·h） to 22. 2 mg COD /（ L·h）.