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Savic, Dragisa
University of Nis
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article
Scaling up the chemical treatment of spent oil-in-water emulsions from a non-ferrous metal-processing plant
Abstract
<jats:p>The treatment of spent oil-in-water emulsion (SOWE) from a non-ferrousmetal-processing plant by using aluminum sulfate and hydrated lime wasstudied to determine the purification efficiency, to optimize the operatingconditions and to scale up the treatment process. The purification efficiencywas estimated by comparing the compositions of the SOWE and the processedwastewater. The treatment efficiency does not depend on the type of mineraloil and filter aid. The optimum doses of aluminum sulfate and hydrated limemust be experimentally determined for each batch of SOWEs, but the resultsobtained at laboratory level are applicable at pilot level. The processedwastewater and the filter cake from the process can be safely disposed intopublic sewage systems and at municipal waste landfills, respectively. Thepurification efficiency was higher than 98% with respect to total suspendedsolids, chemical oxygen demand and oil and grease, and was comparable to theknown treatment processes based on coagulation/flocculation followed bysedimentation.</jats:p>