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http://dx.doi.org/10.17137/Korrae.2014.22.2.50

Effects of pH and slow mixing conditions on heavy metal hydroxide precipitation  

Park, Jong-Hun (Department of Environmental Engineering, Daegu University)
Choi, Gyu-Jin (Department of Environmental Engineering, Daegu University)
Kim, Sang-Hyoun (Department of Environmental Engineering, Daegu University)
Publication Information
Journal of the Korea Organic Resources Recycling Association / v.22, no.2, 2014 , pp. 50-56 More about this Journal
Abstract
Conventional coagulation-gravity settling processes in heavy metal removal have a problem in coagulant cost and instability of the settling efficiency. The authors investigated the effects of pH and slow mixing conditions on heavy metal hydroxide precipitation and the particle size distribution of the precipitate for a precipitation-membrane separation process. The optimum pH values for the hydroxide precipitation ranged from 9 to 10. The addition of $FeCl_3$ did not enhance the heavy metal removal. 20 min of slow mixing at 70 rpm showed the maximum heavy metal removal to meet the water quality criteria for effluent discharge. More than 99.9% of the heavy metal precipitate particles were bigger than $2{\mu}m$.
Keywords
Metal hydroxide precipitation; Heavy metal; particle size analysis; slow mixing; pH;
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