【摘要】 以六价铬废水为处理对象,采用电絮凝过程研究了槽电压、初始浓度、初始pH值、电极材料等工艺参数对电絮凝过程分离Cr(Ⅵ)离子效率的影响机理。结果表明,采用Fe/Fe电极,对初始浓度为105 mg/L的Cr(Ⅵ)离子废水,最优槽电压为4 V,初始pH值为6,电解60 min,去除率可达到98.84%。Cr(Ⅵ)的去除率随着槽电压的升高而增大,随着初始浓度以及初始pH值的增加而减小。研究发现,初始pH值决定电絮凝过程中Cr(Ⅵ)的主要去除方式,在偏中性范围内Cr(Ⅵ)主要通过絮体吸附作用去除。对不同电极材料的电絮凝过程电解产生的絮体进行了初步分析,结果表明,絮体成分因电极不同而异,不同絮体对重金属离子吸附能力的差异也较大。更多还原

【Abstract】 The performance of electrocoagulation( EC) process in the treatment of the wastewater containing Cr( Ⅵ) was investigated. The effects of several parameters such as cell voltage,initial concentration,pH value and electrode materials on removal efficiency of EC were studied. The results showed that the removal efficiency of Cr( Ⅵ) with Fe /Fe electrode could reach up to 98. 84% when initial concentration was 105 mg /L,cell voltage was 4 V and pH value was 6 after 60 min electrolysis. The removal efficiency of Cr( Ⅵ) increased with the increment of the cell voltage and decreased with the rise of initial concentration and initial pH values of Cr( Ⅵ). It was found that at neutral pH range,Cr( Ⅵ) was mainly separated by adsorption of Fe hydroxide flocs. The components of flocs produced during EC processes were preliminarily analyzed. The results showed that the components of the flocs varied with the different electrode pairs as well as the adsorption capacities of flocs to Cr( Ⅵ).更多还原