Process development for the removal of copper from wastewater using ferric/limestone treatment |
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Authors: | Chang?Duk?Kang Email author" target="_blank">Sang?Jun?SimEmail author Young?Sang?Cho Woo?Sik?Kim |
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Affiliation: | (1) Department of Chemical Engineering, Sungkyunkwan University, Suwon, 440-746 Kyunggi, Korea;(2) Department of Chemical Engineering, Kyung Hee University, Yongin, 449-701 Kyunggi, Korea;(3) Clean Technology Research Center, Korea Institute of Science and Technology, 136-791 Seoul, Korea |
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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// of Fe(m) 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. |
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Keywords: | Copper Limestone Ferric Chloride Coagulation Filtration |
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