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《Environmental Science》 2007-01
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Hydrolysis Law and Coagulation Mechanism of Poly-silicic-ferric Sulfate(PSF) Coagulant

FU Ying~(1,2),YU Shui-li~1(1.School of Municipal and Environmental Engineering,Harbin Institute of Technology,Harbin 150090,China;2.Dezhou University,Shandong Dezhou 253023,China)  
A new type of inorganic coagulant,poly-silicic-ferric sulfate(PSF) was prepared using water glass,ferrous sulfate and sodium chlorate with co-polymerized method,and the hydrolysis process of PSF was studied.The microproperties(microstructure,size of species and Zeta potential) and coagulation performance of PSF were explored compared with polyferric sulfate(PFS) and polyferric aluminum(PFA),and coagulation mechanism of PSF was analyzed primarily using hydrolysis species distribution and microproperties.The results show that the morphology of PSF is characterized by having multi-branched structures with larger size,wider molecular weight and bigger fractal dimension,while PFS and PFA are some conglomerate of some sphere or stick shapes with almost the same molecular weight and lower fractal dimension.The average diameter of PSF is more than 5 or 11 times the size of PFS or PFA,respectively,and Zeta potential of PSF is almost equal to that of PFS but is far lower than that of PFA.The hydrolysis process of PSF in surface water can be surrogated by that in pure water.The distribution of hydrolysis species of PSF at different pH value is different due to its characteristic microproperties,which causes the distinction of coagulation mechanism.Three kinds of hydrolysis products [Fe(OH)_3、Fe(OH)~(2+) and Fe~(3+)] in wider pH range(5pH9) is approximately constant,which is the essential reason that PSF has superior coagulant efficiency in water treatment with wider pH range and that the coagulation mechanism of PSF is the cooperation of enhanced charge-neutralization/destabilization and bridging.The comparison between hydrolysis species distribution and coagulation performance reveals reasonably that charge-neutralization/destabilization is the precondition and bridging is the necessary condition in coagulation process,and efficient coagulation can be obtained only by the close cooperation of that two stages.
【Fund】: 国家重点基础研究发展规划(973)项目(2004CB418500)
【CateGory Index】: X703
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