Influence of coagulation mechanisms and floc formation on filterability

作     者：Ruyuan Jiao Rolando Fabris Christopher W.K.Chow Mary Drikas John van Leeuwen Dongsheng Wang Zhizhen Xu 

作者机构：State Key Laboratory of Environmental Aquatic ChemistryResearch Center for Eco-Environmental SciencesChinese Academy of Sciences Australian Water Quality CentreSouth Australian Water Corporation Centre for Water Management and ReuseSchool of Natural and Built EnvironmentsUniversity of South Australia Key Laboratory of Occupational Safety and HealthBeijing Municipal Institute of Labor Protection 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2017年第29卷第7期

页      面：338-345页

核心收录：

学科分类：08[工学] 0815[工学-水利工程] 

基　　金：supported by the National Natural Science Foundation of China(Nos.51308008,51179099) SA Water Visiting International Academics,Graduates,Researchers and Affiliates(VIAGRA) Fund Uni SA Visiting Researcher Fund 

主　　题：Coagulation mechanisms Floc characteristics Filterability Turbidity 

摘      要：Minimizing particles in water is a key goal for improving drinking water quality and *** media filtration process,as the last step of the solid–liquid separation process,is largely influenced by the characteristics of flocs,which are formed and controlled within the coagulation *** a laboratory-based study,the impacts of the physical characteristics of flocs formed using aluminum sulfate on the filtration treatment of two comparative water samples were investigated using a photometric dispersion analyzer and a filterability *** general,the optimum dosage for maximizing filterability was higher than that for minimizing turbidity under neutral p H *** a monomeric aluminum-based coagulant,the charge neutralization mechanism produced better floc characteristics,including floc growth speed and size,than the sweep flocculation *** addition,the charge neutralization mechanism showed better performance compared to sweep flocculation in terms of DOC removal and floc filterability improvement for both waters,and showed superiority in turbidity removal only when the raw water had high *** the different mechanisms,the ways that floc characteristics impacted on floc filterability also *** low variation in floc size distribution obtained under the charge neutralization mechanism resulted in the flocs being amenable to removal by filtration *** the sweep flocculation mechanism,increasing the floc size improved the settling ability of flocs,resulting in higher filter efficiency.