中文摘要:
采用鐵炭微電解-Fenton聯合工藝深度處理制藥廢水生化出水，探討了初始pH、曝氣量、反應時間等因素對微電解出水Fe2+和Fe3+變化規律、COD降解速率以及后續Fenton氧化效果的影響，為優化微電解-Fenton氧化聯合工藝提出了微電解間歇加酸的理論。間歇加酸可提高微電解系統中COD降解速率和Fe2+含量，使后續Fenton氧化無需投加FeSO4·7H2O即可達到較好的COD去除效果。結果表明，當初始pH=2.5，曝氣量為 0.6 m3/h，間歇加酸30 min/次，微電解反應2 h，出水投加1 mL/L的H2O2進行Fenton氧化2 h，COD總去除率可達81.33%；間歇加酸30 min/次可將微電解反應2 h出水Fe2+濃度從50 mg/L提高至151 mg/L，COD降解速率從10.6 mg COD/（L·h）提高至22.2 mg COD/（L·h）。
英文摘要:
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 was 2 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).