Physico-chemical aspects in flocculation of bentonite suspensions by a cyanobacterial bioflocculant

N. Levy; S. Magdassi; Y. Bar-Or

doi:10.1016/0043-1354(92)90225-S

Physico-chemical aspects in flocculation of bentonite suspensions by a cyanobacterial bioflocculant

N. Levy^*, S. Magdassi, Y. Bar-Or

^*Corresponding author for this work

Institute of Chemistry

Research output: Contribution to journal › Article › peer-review

60 Scopus citations

Abstract

The biopolymer produced by Anabaenopsis circularis strain PCC 6720 was found to be an effective anionic flocculant for bentonite suspensions. The presence of CaCl₂ increased the flocculation efficiency significantly. From adsorption isotherms and zeta-potential measurements, it was concluded that the flocculation process is based on the bridging mechanism. The role of CaCl₂ is to increase the initial adsorption of the biopolymer on the bentonite particles. It also decreases the negative electrical charge of the bentonite particles and of the biopolymer molecules. The dominant role of the bioflocculant in the flocculation process is discussed according to the theoretical interaction energy curves.

Original language	English
Pages (from-to)	249-254
Number of pages	6
Journal	Water Research
Volume	26
Issue number	2
DOIs	https://doi.org/10.1016/0043-1354(92)90225-S
State	Published - Feb 1992

Keywords

adsorption
bentonite
bioflocculant
electrophoretic mobility
flocculation

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10.1016/0043-1354(92)90225-S

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title = "Physico-chemical aspects in flocculation of bentonite suspensions by a cyanobacterial bioflocculant",

abstract = "The biopolymer produced by Anabaenopsis circularis strain PCC 6720 was found to be an effective anionic flocculant for bentonite suspensions. The presence of CaCl2 increased the flocculation efficiency significantly. From adsorption isotherms and zeta-potential measurements, it was concluded that the flocculation process is based on the bridging mechanism. The role of CaCl2 is to increase the initial adsorption of the biopolymer on the bentonite particles. It also decreases the negative electrical charge of the bentonite particles and of the biopolymer molecules. The dominant role of the bioflocculant in the flocculation process is discussed according to the theoretical interaction energy curves.",

keywords = "adsorption, bentonite, bioflocculant, electrophoretic mobility, flocculation",

author = "N. Levy and S. Magdassi and Y. Bar-Or",

year = "1992",

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doi = "10.1016/0043-1354(92)90225-S",

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journal = "Water Research",

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T1 - Physico-chemical aspects in flocculation of bentonite suspensions by a cyanobacterial bioflocculant

AU - Levy, N.

AU - Magdassi, S.

AU - Bar-Or, Y.

PY - 1992/2

Y1 - 1992/2

N2 - The biopolymer produced by Anabaenopsis circularis strain PCC 6720 was found to be an effective anionic flocculant for bentonite suspensions. The presence of CaCl2 increased the flocculation efficiency significantly. From adsorption isotherms and zeta-potential measurements, it was concluded that the flocculation process is based on the bridging mechanism. The role of CaCl2 is to increase the initial adsorption of the biopolymer on the bentonite particles. It also decreases the negative electrical charge of the bentonite particles and of the biopolymer molecules. The dominant role of the bioflocculant in the flocculation process is discussed according to the theoretical interaction energy curves.

AB - The biopolymer produced by Anabaenopsis circularis strain PCC 6720 was found to be an effective anionic flocculant for bentonite suspensions. The presence of CaCl2 increased the flocculation efficiency significantly. From adsorption isotherms and zeta-potential measurements, it was concluded that the flocculation process is based on the bridging mechanism. The role of CaCl2 is to increase the initial adsorption of the biopolymer on the bentonite particles. It also decreases the negative electrical charge of the bentonite particles and of the biopolymer molecules. The dominant role of the bioflocculant in the flocculation process is discussed according to the theoretical interaction energy curves.

KW - adsorption

KW - bentonite

KW - bioflocculant

KW - electrophoretic mobility

KW - flocculation

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SN - 0043-1354

VL - 26

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EP - 254

JO - Water Research

JF - Water Research

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ER -

Physico-chemical aspects in flocculation of bentonite suspensions by a cyanobacterial bioflocculant

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