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DOI : ,    Vol.3, No.1, 45 ~ 61, 1995
Articles / Characteristics of Different Prepolymerized Coagulants on Residual Aluminium Concentration in Drinking Water Treatment
곽종운Jong Woon Kwak,안규홍Kyu Hong Ahn,Rolf Nilsson
This study was carried out to demonstrate the influences of different prepolymerized coagulants on residual aluminium concentration in drinking water treatment under the specified working conditions. In order to minimize the residual aluminium concentration, chemical and physical boundary conditions were important factors. It has shown that there is a significant potential for reducing residual aluminium if chemical bound ary condition is optimized. Chemically, PACS was more characteristic to the capability of both coagulating and flocculating and then it showed relatively the less aluminium concentration in the treated water, i.e. it was easier to sweep up the primary microflocs. However, the preactivated coagulants required a sufficient transport energy of high mixing intensity. Residual aluminium concentration was also evaluated to be influenced from a molecular weight distribution of preactivated aluminium coagulant as well as alkalinity, floc settleability, dissolved organic complexes and pH. Dissolved organics were negative for the less residual aluminium as they are reactive to aluminium ions in solution to form an organic complexes which lead consequently to increase the apparent solubility. It may be concluded that the pH should be kept within certain limits to minimum or fulfill the requirement of the water quality standards. The increase in alkalinity of raw water was negative for residual aluminium since a form of aluminium multications can immediately be decomposed to give the microflocs as far as a condition supports it.
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