Article ID Journal Published Year Pages File Type
594924 Colloids and Surfaces A: Physicochemical and Engineering Aspects 2011 5 Pages PDF
Abstract

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 423 mg/L to 6.8 mg/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 5000 m3 of industrial wastewater, with average arsenic concentration of 465 mg/L, was safe treated and disposed by a combined pilot-scale system. The average effluent concentration of the system was 0.008 mg/L which meet the discharge limit of 0.05 mg/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.

Related Topics
Physical Sciences and Engineering Chemical Engineering Colloid and Surface Chemistry
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