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http://dx.doi.org/10.4491/KSEE.2013.35.3.226

Evaluation of Organics and Inorganics Removal of Physicochemical Pretreatment Processes for Reuse of Metal Industry Wastewater  

Ha, Dong-Hwan (Department of Environmental Engineering, Yeungnam University)
Jung, Jin-Young (Department of Environmental Engineering, Yeungnam University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.35, no.3, 2013 , pp. 226-232 More about this Journal
Abstract
Several pretreatment processes such as softening, coagulation and precipitation, activated carbon adsorption, ion-exchange and neutralization processes were studied to remove organics and inorganics for selection of the RO based reusing system of metal industry wastewater. The effects of the hydrophobic/hydrophilic fractions of the organics on DOC removal were tested and used to optimize the combination process. Among various pretreatment processes, softening could reduce 93.4% of hardness and could remove all hydrophobic organics from the effluent of metal industry wastewater. Softening followed by coagulation process could reduce DOC (Dissolved Organic Carbon) from 5.1 mg/L to 1.6 mg/L. In addition, as a result of physiochemical pretreatment to raw wastewater of metal industry, neutralization with NaOH showed an efficient removal of iron and TDS (Total Dissolved Solids) without increase in the hardness.
Keywords
Metal Industry Wastewater; Water Reuse; Reverse Osmosis; Pretreatment; Organic Fractionation;
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