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DOI	10.1016/j.envres.2024.118590
	Analysing the role of Fe (II) on flocculation of sand-clay mixtures under estuarine mixing
	Febina, A. Manaf; Priya, K. L.
发表日期	2024
ISSN	0013-9351
EISSN	1096-0953
起始页码	251
卷号	251
英文摘要	Estuaries are fragile environment that are most affected by climate change. One of the major consequences of climate change on estuarine processes is the enhancement in salt intrusion leading to higher salinity values. This has several implications on the estuarine sediment dynamics. Of the various factors that affect the flocculation of cohesive sediments, salinity and turbulence have been recognized as to have great significance. Many of the estuaries are contaminated with heavy metals, of which, the concentration of Iron (Fe (II)) are generally on the higher range. However, the influence of Fe (II) on the flocculation of cohesive sediments at various estuarine mixing conditions is not well known. The present study investigated the influence of Fe (II) on the flocculation of kaolin at various concentration of Fe (II), salinity and turbulence shear. The results indicated that Fe (II) and salinity have a positive influence on kaolin flocculation. The increase in turbulence shear caused an initial increase and then a decrease in floc size. In case of sand -clay mixtures, that are observed in mixed sediment estuarine environments, a reduction in the floc size was observed, which is attributed to the breakage of flocs induced by the shear of sand. Breakage coefficient, which is a measure of break-up of flocs, is generally adopted as 0.5 assuming binary breakage. The present study revealed that the breakage coefficient can take values from 0 to 1 and is a direct function of Fe (II) and salinity and an inverse function of turbulence and sand concentration. Thus, a new model for breakage coefficient with the influencing parameters has been proposed, which is an improvement of existing model that is expressed in terms of turbulence alone. Sensitivity analysis showed that the proposed model can very well predict the breakage coefficient of Fe (II) - kaolin flocs. Thus, the model can quantify the breakage coefficient of flocs in estuaries contaminated with Fe (II) that is a vital parameter for population balance models.
英文关键词	Flocculation; Fe (II); Turbulence shear; Sand-clay mixtures; Salinity; Breakage coefficient
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Public, Environmental & Occupational Health
WOS类目	Environmental Sciences ; Public, Environmental & Occupational Health
WOS记录号	WOS:001221861300001
来源期刊	ENVIRONMENTAL RESEARCH
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/290885
作者单位	Thangal Kunju Musaliar College of Engineering
推荐引用方式 GB/T 7714	Febina, A. Manaf,Priya, K. L.. Analysing the role of Fe (II) on flocculation of sand-clay mixtures under estuarine mixing[J],2024,251.
APA	Febina, A. Manaf,&Priya, K. L..(2024).Analysing the role of Fe (II) on flocculation of sand-clay mixtures under estuarine mixing.ENVIRONMENTAL RESEARCH,251.
MLA	Febina, A. Manaf,et al."Analysing the role of Fe (II) on flocculation of sand-clay mixtures under estuarine mixing".ENVIRONMENTAL RESEARCH 251(2024).