氧化—絮凝—A/O处理甲基多巴生产废水研究

Oxidation - flocculation - A/O processes for treating the wastewater from methyldopa production

甲基多巴是一种降压药物,其生产废水具有高色度、高有机物浓度和生物难降解的特性。采用Fenton氧化—PAM絮凝—A/O生化工艺处理该废水。Fenton氧化处理的优化条件为:pH5.0,n(Fe2+)∶n(H2O2)=1∶4,H2O2和绿矾投加质量浓度分别为5.0g/L和10.2g/L,反应时间2.0h。PAM絮凝处理的优化条件为:pH7.0,投加量16.7mg/L。经过Fenton氧化—PAM絮凝处理,CODCr去除率达到74%,脱色率达95%,B/C由0.17升到0.38,废水的可生化性明显提高。后续采用A/O工艺进一步处理,可再去除70%￣80%的CODCr。

Methyldopa is a widely used antihypertensive medicine. The wastewater from methyldopa production is of high chroma, high concentration of organic pollutants and resistance to biodegradation. The processes of Fenton oxidation-PAM flocculation-MO （anoxic and aerobic biodegradation） have been applied to treat the wastewater. The experimental results show that the optimized conditions for Fenton oxidation treatment of the wastewater are：pH 5.0, n（Fe^2＋） ： n（H2O2） = 1：4 ,concentration of H2O2 5.0 g/L,concentration of FeSO4·7H2O 102. g/L and reaction time 2.0 h. The optimized conditions for PAM flocculation of the wastewater are：pH 7.0,concentration of PAM 16.7 mg/L. After the Fenton oxidation-PAM flocculation treatment,CODCr removal efficiency and the decoloration rate are 74% and 95% respectively. The ratio of BOD5/CODCr increases from 0.17 to 0.38. The biodegradability of the wastewater is significantly improved after Fenton oxidation treatment. Then,the A/O processes are conducted for further treatment, 70%- 80% CODCr could be removed again.