標題: Time requirement for rapid-mixing in coagulation
作者: Kan, CC
Huang, CP
Pan, JRS
環境工程研究所
Institute of Environmental Engineering
關鍵字: coagulation;rapid-mixing;photometric dispersion analyzer (PDA);water treatment;turbidity
公開日期: 25-四月-2002
摘要: Mechanisms of coagulation have been widely investigated by many researchers. Little is understood about the critical role of rapid-mixing in water treatment. In this study, a photometric dispersion analyzer (PDA) was employed to monitor clay coagulation by alum and polymeric aluminum chloride (PACl). The effect of rapid-mixing time on particle removal was studied. A standard jar test was performed to determine the degree of destabilization of particles. Maximum ratio outputs of PDA measurements were inversely related to residual turbidities. Adequate rapid-mixing times evaluated from both PDA and mixing tests were close to each other. Studies of coagulation mechanisms at various rapid-mixing times indicated that mixing time had significant impact on charge neutralization and sweep coagulation. The difference in residual turbidity can be attributed to the characteristics of microflocs. The rise in residual turbidity in sweep coagulation suggested the breakage of microflocs. (C) 2002 Elsevier Science B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/S0927-7757(01)01095-0
http://hdl.handle.net/11536/28857
ISSN: 0927-7757
DOI: 10.1016/S0927-7757(01)01095-0
期刊: COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume: 203
Issue: 1-3
起始頁: 1
結束頁: 9
顯示於類別:期刊論文


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