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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received May 9, 2002
Accepted November 8, 2002

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Process Development for the Removal of Copper from Wastewater using Ferric/Limestone Treatment

Chang Duk Kang Sang Jun Sim^1† Young Sang Cho² Woo Sik Kim

Department of Chemical Engineering, Kyung Hee University, Yongin, Kyunggi 449-701, Korea ¹Department of Chemical Engineering, Sungkyunkwan University, Suwon, Kyunggi 440-746, Korea ²Clean Technology Research Center, Korea Institute of Science and Technology, Seoul 136-791, Korea

Korean Journal of Chemical Engineering, May 2003, 20(3), 482-486(5), 10.1007/BF02705552

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Abstract

The removal of copper from wastewater by ferric/limestone coagulation followed by screen filtration was carried out at a laboratory scale. The optimum coagulant (FeCl3) dose and working pH were 50 mg/l of Fe(III) and pH 7.5, respectively, through jar tests. For the efficient removal of copper from wastewater, we developed a novel process including the co-precipitation of copper with FeCl3, alkalization in a limestone aeration bed, and separation of precipitates in a sedimentation tank coupled with internal stainless steel screen filter. The performance results showed that removal of copper from the solution was over 99.5%. The pH was effectively maintained over 7.5 in limestone bed during the whole process. Ferric hydroxide/copper aggregates were removed over 99% by stainless steel screen filter of 1,450 mesh. Periodic air backwashing alleviated fouling of the filter surface.

Keywords

Copper Limestone Ferric Chloride Coagulation Filtration

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