Treatment of high arsenic content wastewater by a combined physical–chemical process
2011
Wang, Hong-Jie | Gong, Wen-Xin | Liu, Rui-Ping | Liu, Hui-Juan | Qu, Jiu-Hui
The performance of a novel combined process, consisting of pre-oxidation, co-precipitation, adsorption and coagulation was investigated for treatment of high arsenic content industrial wastewater. KMnO₄ was used to oxidize As(III) to As(V) firstly, meanwhile the total arsenic concentration reduced about 9%. Then lime and ferrous co-precipitation was performed and the arsenic concentration decreased dramatically from 423mg/L to 6.8mg/L. Subsequent ferric and manganese binary oxide (FMBO) adsorption and polyaluminum chloride (PACl) coagulation process as a final treatment removed over 99.88% of the residual arsenic. About 5000m³ of industrial wastewater, with average arsenic concentration of 465mg/L, was safe treated and disposed by a combined pilot-scale system. The average effluent concentration of the system was 0.008mg/L which meet the discharge limit of 0.05mg/L, and the total removal efficiency was 99.998%. The pilot-scale results indicated that the combined process would be advantageous and practical in treating of high arsenic content wastewater, especially in treating emergency accident of arsenic pollution.
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