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Effects of soluble organics on the settling rate of modified clay and development of improved clay formulations for harmful algal bloom control
Jiang, Wenbin1,2,3,4; Yu, Zhiming1,2,3,4; Cao, Xihua1,2,3,4; Jiang, Kaiqin1,2,3,4; Yuan, Yongquan1,2,4; Anderson, Donald M.5; Song, Xiuxian1,2,3,4
2021-11-15
Source PublicationENVIRONMENTAL POLLUTION
ISSN0269-7491
Volume289Pages:11
Corresponding AuthorYu, Zhiming(zyu@qdio.ac.cn)
AbstractFor 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.
KeywordModified clay Humic acid Dissolved organic matter Settling rate Harmful algal blooms Particle image velocimetry
DOI10.1016/j.envpol.2021.117964
Indexed BySCI
Language英语
Funding ProjectMarine 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 Research AreaEnvironmental Sciences & Ecology
WOS SubjectEnvironmental Sciences
WOS IDWOS:000697054200003
PublisherELSEVIER SCI LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/176425
Collection海洋生态与环境科学重点实验室
Corresponding AuthorYu, Zhiming
Affiliation1.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
First Author AffilicationKey Laboratory of Marine Ecology & Environmental Sciences, CAS
Corresponding Author AffilicationKey Laboratory of Marine Ecology & Environmental Sciences, CAS
Recommended Citation
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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