Unlike organic contaminants, heavy metals which are known to be toxic or carcinogenic tend to accumulate in living organisms because they are not biodegradable. This paper reviews the theoretical models in applying electrocoagulation and electrolysis to remove heavy metals and discrete particulate particles in washwater by examining and comparing the status of washwater treatment technologies which have been undertaken, mostly in the US and EU for the period 1990-2012.Įlectrocoagulation, Electrolysis, Precipitation, Heavy Metals, Washwater, Soil Washing Electrical treatments including electrocoagulation and electrolysis can be effective in removing these substances from washwater. However, washwater remained from soil washing process contains discrete particulate particles along with heavy metals as solution phase to be treated separately, as well as this pro- cess can produce large amount of sludge that requires further treatment, slow metal precipitation, poor settling, the aggregation of metal precipitates. Soil washing, ex situ mechanical technique, is one of the few permanent treatment alternatives to remove metal contaminants from soils by employing physical separation based on mineral pro- cessing technologies to remove discrete particles or metal-bearing particles and/or chemical ex- traction based on leaching or dissolving process to extract the metals from the soils into an aqueous solution. Received 28 August 2014 revised 29 September 2014 accepted 7 October 2014
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This work is licensed under the Creative Commons Attribution International License (CC BY). Department of Bio-Environmental Chemistry, College of Agriculture and Life Science, Chungnam National University, Daejeon, KoreaĮmail: * © 2014 by authors and Scientific Research Publishing Inc.
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