Treatment of low turbidity water by sweep coagulation using bentonite

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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 languageEnglish
Pages (from-to)581-586
Number of pages6
JournalJournal of Chemical Technology and Biotechnology
Volume80
Issue number5
DOIs
Publication statusPublished - 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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