Abstract:

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- PAMflocculation-A/O (anoxic and aerobic biodegradation) have been applied to treat the wastewater. The experimental results showthat the optimized conditions for Fenton oxidation treatment of the wastewater are: pH 5.0,n( Fe²⁺) ∶n(H₂O₂) =1 ∶4, concentration of H₂O₂ 5.0 g/L, concentration of FeSO₄·7H₂O 10.2 g/L and reaction time 2.0 h. The optimized conditions for PAMflocculation of the wastewater are: pH 7.0, concentration of PAM16.7 mg/L. After the Fenton oxidation- PAMflocculation treatment, COD_Cr removal efficiency and the decoloration rate are 74% and 95% respectively. The ratio of BOD5 /COD_Cr 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 furthertreatment, 70%- 80% CODCr could be removed again.

Key words: methyldopa, Fenton oxidation, decoloration, wastewater treatment

摘要：

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,COD_Cr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COD_Cr。

关键词: 甲基多巴, Fenton氧化, 脱色, 废水处理

CLC Number: 

• X703.1