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Environmental Engineering Research 2006;11(4): 208-216. DOI: https://doi.org/10.4491/eer.2006.11.4.208
A SINGLE FLOCCULANT/DUAL FLOCCULATION SYSTEM FOR DEW ATE RING USING A BRANCHED SELF IN VERSING EMULSION FLOCCULANT
Young-Han Bae, and Sung-Sik Lee
Department of Chemical Engineering, Dong-A University 840 Hadan-2-Dong, Saha-Ku, 604-714,Busan, KOREA
Corresponding Author: Sung-Sik Lee ,Tel: +82-(0)5I-200-7721 , Fax: +82-(0)51-200-7728, Email: hanchemen@yahoo.co.kr
Received: February 8, 2006;  Accepted: April 10, 2006.
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ABSTRACT
In order to create a single fiocculant/dual flocculation system, polyacryiamide-co-trimethyl ammonium ethyl acrylate chloride (TAEAC) polymers with varying molecular weights and structures were prepared for use of flocculants. The higher the cationic density of the polymer is higher, the higher was the conversion rate and the ratio of monomer. An acrylamide as nonionic monomer was less reactive than a TAEAC as cationic monomer. The branched polymer which was polymerized with a cross-linking agent, N, N-methylene bis-acrylamide had a higher stability and higher viscosity than a linear polymer but its dewatering efficiency was poor in a single flocculation system. In the case of single flocculant/dual flocculation, the branched polymer has better flocculation efficiency and the water content of the dewatered cakes was lower than the others, as the result of a re-floccalation effect. The optimum conditions for dual flocculation are a sequence in which the 1st and 2nd dosage are 75% and 25%/total dosage of a single flocculation system. The dewatering efficiency of a dual flocculation system is improved considerably from 10 to 25% under the experimental conditions used herein.
Keywords: Polyacrylamide | Flocculation | Dewatering | Branched polymer | N | N-methylene bis-acrylamide
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