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Removal of Hardness Ions by Crossflow Ceramic Ultrafiltration Process with Adding Lime-soda Ash  

Park, Jin-Yong (Department of Environmental Sciences & Biotechnology, Hallym University)
Park, Bo-Reum (Department of Environmental Sciences & Biotechnology, Hallym University)
Publication Information
Membrane Journal / v.17, no.3, 2007 , pp. 191-196 More about this Journal
Abstract
In the study, excess of lime-soda ash(L-S) was added to groundwater for chemical precipitation of hardness ions. After formation of the coagulated flocs, sedimentation step was replaced with crossflow ultrafiltration(UF) process using tubular ceramic membrane. As results, our treated water was below total hardness(TH) 10 mg/L as $CaCO_3$ from groundwater using washing water in a soymilk factory. Then, we investigated the change of permeat flux(J) and dimensionless permeate flux($J/J_0$) during experiments for variations of TMP(Trans-membrane pressure) or flow rate, to see effect of TMP or flow rate on membrane fouling by the coagulated Inorganic flocs. In the result, membrane fouling and rejection rate of total hardness were not affected by TMP and flow rate variations in the range of our experiments.
Keywords
softening; ceramic membrane; ultrafiltration; coagulation; hardness;
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Times Cited By KSCI : 1  (Citation Analysis)
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