Title: Performance of four polyelectrolytes as flocculation aids in the primary treatment of textile effluents

Authors: Ackmez Mudhoo, Arvinda Kumar Ragen, Ganesh Dookee

Addresses: Faculty of Engineering, Department of Chemical and Environmental Engineering, University of Mauritius, Mauritius. ' Faculty of Engineering, Department of Chemical and Environmental Engineering, University of Mauritius, Mauritius. ' Solid Waste Management Division, Ministry of Local Government, Rodrigues and Outer Islands, Sir Emmanuel Anquetil Building, Port Louis, Mauritius

Abstract: Samples of textile effluents were subjected to physico-chemical treatment using alum, Polyaluminium Chloride (PAC), and different anionic and cationic acrylamide copolymers. Except for alum, all chemicals were tested individually. Combinations of alum and PAC with different anionic and cationic polyelectrolytes were also tested. Results indicated the anionic polyelectrolyte to be the best polymer when used in combination with inorganic coagulants. 30-40 mg/L PAC and 0.75 mg/L of anionic polymer resulted in the best removals of Chemical Oxygen Demand (COD), Total Suspended Solids (TSS) and Turbidity of 32.0-38.2%, 80.0-85.0% and 25.3-47.0%, respectively. This study indicated that dye-loaded textile wastewater could be treated with blends of inorganic–organic coagulants to reduce the organic load. However, the colour of the wastewater could not be removed.

Keywords: textile effluent; physico-chemical treatment; conventional coagulants; polyelectrolytes; COD removal; chemical oxygen demand; wastewater treatment; flocculation; alum; polyaluminium chloride; PAC; acrylamide copolymers; textile dyes.

DOI: 10.1504/IJEWM.2010.032004

International Journal of Environment and Waste Management, 2010 Vol.5 No.3/4, pp.211 - 223

Available online: 04 Mar 2010

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