Treatment of low turbidity water by sweep coagulation using bentonite

Yun Hwei Shen

doi:10.1002/jctb.1244

Treatment of low turbidity water by sweep coagulation using bentonite

Yun Hwei Shen

Department of Resources Engineering

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

16 Citations (Scopus)

Abstract

A novel strategy of sweep coagulation to treat low turbidity water is presented herein. Study findings demonstrated that an Na⁺-saturated bentonite with medium cation exchange capacity (CEC) resulted in significant turbidity removal at a bentonite dosage of 30 mg dm^-3. Bentonite dispersion with fully delaminated platelets tended to undergo a more porous type of coagulation with intense face-to-face interactions of platelets and effectively entrapped TiO₂ particles in band-type structures. This type of coagulation usually results in a large volume of settled flocs with a fluffy structure and excellent turbidity removal efficiency for sweep coagulation. The sign and magnitude of electrical charge on TiO₂ particles has a minor effect on the efficiency of sweep coagulation.

Original language	English
Pages (from-to)	581-586
Number of pages	6
Journal	Journal of Chemical Technology and Biotechnology
Volume	80
Issue number	5
DOIs	https://doi.org/10.1002/jctb.1244
Publication status	Published - 2005 May

All Science Journal Classification (ASJC) codes

Biotechnology
Chemical Engineering(all)
Renewable Energy, Sustainability and the Environment
Fuel Technology
Waste Management and Disposal
Pollution
Organic Chemistry
Inorganic Chemistry

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AB - A novel strategy of sweep coagulation to treat low turbidity water is presented herein. Study findings demonstrated that an Na+-saturated bentonite with medium cation exchange capacity (CEC) resulted in significant turbidity removal at a bentonite dosage of 30 mg dm-3. Bentonite dispersion with fully delaminated platelets tended to undergo a more porous type of coagulation with intense face-to-face interactions of platelets and effectively entrapped TiO2 particles in band-type structures. This type of coagulation usually results in a large volume of settled flocs with a fluffy structure and excellent turbidity removal efficiency for sweep coagulation. The sign and magnitude of electrical charge on TiO2 particles has a minor effect on the efficiency of sweep coagulation.

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JO - Journal of Chemical Technology and Biotechnology

JF - Journal of Chemical Technology and Biotechnology

SN - 0268-2575

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Treatment of low turbidity water by sweep coagulation using bentonite

Abstract

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