Title: Coagulation behaviour of polyaluminium chloride with different aluminium speciation

Authors: Hui-Juan Liu, Cheng-Zhi Hu, Jiu-Hui Qu

Addresses: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. ' Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. ' Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China

Abstract: The coagulation behaviour of polyaluminium chloride (PACl) with different contents of aluminium species (Alm, Al13, Alu detected by 27Al NMR spectroscopy) was investigated by using the conventional jar test together with studying the rate of floc size development, the zeta potential of particles and turbidity removal efficiency. Results show that Al13 has higher charge neutralisation ability, while Alu species contribute to the formation of hydroxide precipitates which have a rather open structure for capturing particles. The charge neutralisation plays a less important role in coagulation after the coagulant dosage reaching a certain value, while precipitate formation improves coagulation significantly.

Keywords: aluminium species; charge neutralisation; coagulation; PACl; polyaluminium chloride; precipitation; water treatment; hydroxide precipitates; wastewater treatment; kaolin suspensions; zeta potential; turbidity removal; floc growth.

DOI: 10.1504/IJEP.2011.039102

International Journal of Environment and Pollution, 2011 Vol.45 No.1/2/3, pp.281 - 287

Available online: 16 Mar 2011 *

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