Effects of soluble organics on the settling rate of modified clay and development of improved clay formulations for harmful algal bloom control

doi:10.1016/j.envpol.2021.117964

	Effects of soluble organics on the settling rate of modified clay and development of improved clay formulations for harmful algal bloom control
	Jiang, Wenbin 1,2,3,4; Yu, Zhiming1,2,3,4 ; Cao, Xihua1,2,3,4 ; Jiang, Kaiqin 1,2,3,4; Yuan, Yongquan1,2,4 ; Anderson, Donald M.5; Song, Xiuxian1,2,3,4
	2021-11-15
发表期刊	ENVIRONMENTAL POLLUTION
ISSN	0269-7491
卷号	289 页码:11
通讯作者	Yu, Zhiming(zyu@qdio.ac.cn)
摘要	For many years, the dispersal of modified clay (MC) has been used to control harmful algal blooms (HABs) in coastal waters of China. MC flocculation efficiency can be influenced by many factors in variable and complex natural environments, including high concentrations of dissolved organic matter (DOM) in the water to be treated. Since many HABs occur in nearshore waters where DOM concentrations are high, this is a significant problem that requires urgent attention. This study involved the use of humic acid as a representative form of DOM to study the influence of organic matter on the MC flocculation process. At high concentrations, humic acid was adsorbed onto MC particles, resulting in a decrease in surface potential and an increase in electrostatic repulsion between the clay particles; this decreased the MC settling rate and increased the water clarification time. Flocs were characterized by their relatively small particle size, high particle concentration, and low collision efficiency, which together resulted in slow clarification of the water after MC spraying. Based on the mechanism of the DOM-MC interaction and combined with the Derjaguin-Landau-Verwey-Overbeek theory and theoretical considerations of clay surface modification, the "ionic atmosphere compression" method was used to improve MC flocculation efficiency in high-organic water. This method increased the ionic strength of the clay stock solution by adding salt, thereby compressing the ionic atmosphere of MC particles and lowering the potential barrier, allowing the MC particles in the treated water to flocculate rapidly and form large flocs, followed by further floc growth and rapid settling via differential sedimentation. The settling rate of MCs improved by a factor of two and the removal efficiency of the HAB cells increased by 7-28%. This study provides important baseline information that will extend the application of MC to HAB control in water bodies with high organic loadings.
关键词	Modified clay Humic acid Dissolved organic matter Settling rate Harmful algal blooms Particle image velocimetry
DOI	10.1016/j.envpol.2021.117964
收录类别	SCI
语种	英语
资助项目	Marine S&T Fund of Shandong Province for Pilot National Laboratory for Marine Science and Technology (Qingdao)[2018SDKJ0504-2] ; National Natural Science Foundation of China[41976145] ; Key R&D project of Shandong Province[2019JZZ010808] ; Taishan Scholars Climbing Program of Shandong Province of 2019 ; Florida Fish and Wildlife Conservation Commission's Fish and Wildlife Research Institute ; Mote Marine Laboratory
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:000697054200003
出版者	ELSEVIER SCI LTD
引用统计	被引频次：9[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/176425
专题	海洋生态与环境科学重点实验室
通讯作者	Yu, Zhiming
作者单位	1.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Marine Ecol & Environm Sci, Qingdao 266071, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Funct Lab Marine Ecol & Environm Sci, Qingdao 266237, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Chinese Acad Sci, Ctr Ocean Mega Sci, 7 Nanhai Rd, Qingdao 266071, Peoples R China 5.Woods Hole Oceanog Inst, Woods Hole, MA 02543 USA
第一作者单位	海洋生态与环境科学重点实验室
通讯作者单位	海洋生态与环境科学重点实验室
推荐引用方式 GB/T 7714	Jiang, Wenbin,Yu, Zhiming,Cao, Xihua,et al. Effects of soluble organics on the settling rate of modified clay and development of improved clay formulations for harmful algal bloom control[J]. ENVIRONMENTAL POLLUTION,2021,289:11.
APA	Jiang, Wenbin.,Yu, Zhiming.,Cao, Xihua.,Jiang, Kaiqin.,Yuan, Yongquan.,...&Song, Xiuxian.(2021).Effects of soluble organics on the settling rate of modified clay and development of improved clay formulations for harmful algal bloom control.ENVIRONMENTAL POLLUTION,289,11.
MLA	Jiang, Wenbin,et al."Effects of soluble organics on the settling rate of modified clay and development of improved clay formulations for harmful algal bloom control".ENVIRONMENTAL POLLUTION 289(2021):11.

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