NDLI: Flocculation of harmful algal cells using modified clay: effects of the properties of the clay suspension

Content Provider	Springer Nature Link
Author	Liu, Yang Cao, Xihua Yu, Zhiming Song, Xiuxian Qiu, Lixia
Copyright Year	2015
Abstract	Large differences occur between the removal efficiencies (RE) of polyaluminum chloride modified clay (PAC-MC) suspensions prepared using deionized water (DW) and seawater (SW). This showed that physicochemical properties of PAC-MC suspension influenced its ability to remove algal cells. The efficiency at which a PAC-MC suspension removed Aureococcus anophagefferens (CCMP 1984) and Phaeocystis globosa from water was determined using diluted seawater (DSW), dissolved ion species, ion concentrations, pH, temperatures, and suspension aging times. The RE decreased generally as the percentage of seawater increased, and the RE was higher for PAC-MC prepared using DW than that using SW. The ion species present and the ion concentrations in the suspension influenced the RE, with sulfate negatively affecting the RE more than the other ions tested. Sulfate in the PAC-MC suspension showed a “V”-shaped effect which can be partially explained by charge neutralization and “patch coagulation” that played different parts in the flocculation process. The effects of pH of PAC-MC suspension on the RE were greatly influenced by the dispersion medium. The RE of the PAC-MC suspended in DW decreased gradually, whereas RE of the PAC-MC suspended in SW followed a V-shaped trend, as the pH was increased. Surface charge is an important aspect in the removal mechanism of PAC-MC, but the flocculation behavior at low suspension pH conditions is less clear. Temperature and suspension aging time had no obvious effects on the RE. Appropriate explanation and mechanism is also proposed in the discussion. These studies showed that the RE could be further improved given proper attention to the properties of PAC-MC suspension.
Starting Page	1623
Ending Page	1633
Page Count	11
File Format	PDF
ISSN	09218971
Journal	Journal of Applied Phycology
Volume Number	28
Issue Number	3
e-ISSN	15735176
Language	English
Publisher	Springer Netherlands
Publisher Date	2015-10-31
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	HABs Control Modified clay suspension Physicochemical properties Sulfate ion pH Plant Sciences Freshwater & Marine Ecology Plant Physiology Ecology
Content Type	Text
Resource Type	Article
Subject	Plant Science Aquatic Science

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