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The influence of particle size and concentration combined with pH on coagulation mechanisms
Sun, Hongyan; Jiao, Ruyuan; Xu, Hui; An, Guangyu; Wang, Dongsheng
2019-08-01
Source PublicationJOURNAL OF ENVIRONMENTAL SCIENCES
ISSN1001-0742
Volume82Pages:39-46
AbstractIn order to evaluate the influence of particle size and particle concentration on the coagulation process, two kinds of particle suspensions, nanoparticles and microparticles, were employed to investigate the effect of particle size on coagulation mechanisms with varying coagulation parameters. Results showed that it is easier for nanoparticles to cause self-aggregation because of Brownian motion, while interception and sedimentation are the mainly physical processes affecting particle transport for microparticles, so they are more stable and disperse more easily. The particle size distribution and particle concentration had distinct influence on the coagulation mechanisms. Under neutral conditions, as the amount of coagulant increased, the coagulation mechanism for nanoparticles changed from charge neutralization to sweep flocculation and the nanoparticles became destabilized, re-stabilized and again destabilized. For microparticles, although the coagulation mechanism was the same as that of nanoparticles, the increased rate of aluminum hydroxide precipitation exceeded the adsorption of incipiently formed soluble alum species, resulting in the disappearance of the re-stabilization zone. Under acidic conditions, Brownian motion dominates for nanoparticles at low particle concentrations, while sweep flocculation is predominant at high particle concentrations. As for microparticles, charge neutralization and sweep flocculation are themechanisms for low and high particle concentrations respectively. Under alkaline condition, although the mechanisms for both nano- and microparticles are the same, the morphology of flocs and the kinetics of floc formation are different. At low particle concentrations, nanoparticles have larger growth rate and final size of flocs, while at high particle concentrations, nanoparticles have higher fractal dimension and recovery factors. (c) 2019 The Research Center for Eco- Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
Department环境水质学国家重点实验室
KeywordNanoparticles Microparticles Particle size distribution Coagulation mechanisms Alum
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/42676
Collection环境水质学国家重点实验室
Affiliation1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Aquat Chem, Beijing 100085, Peoples R China
2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, Beijing 100085, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Sun, Hongyan,Jiao, Ruyuan,Xu, Hui,et al. The influence of particle size and concentration combined with pH on coagulation mechanisms[J]. JOURNAL OF ENVIRONMENTAL SCIENCES,2019,82:39-46.
APA Sun, Hongyan,Jiao, Ruyuan,Xu, Hui,An, Guangyu,&Wang, Dongsheng.(2019).The influence of particle size and concentration combined with pH on coagulation mechanisms.JOURNAL OF ENVIRONMENTAL SCIENCES,82,39-46.
MLA Sun, Hongyan,et al."The influence of particle size and concentration combined with pH on coagulation mechanisms".JOURNAL OF ENVIRONMENTAL SCIENCES 82(2019):39-46.
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