Coagulation behaviour of polyaluminium chloride with different aluminium speciation
by Hui-Juan Liu, Cheng-Zhi Hu, Jiu-Hui Qu
International Journal of Environment and Pollution (IJEP), Vol. 45, No. 1/2/3, 2011

Abstract: The coagulation behaviour of polyaluminium chloride (PACl) with different contents of aluminium species (Al_m, Al₁₃, Al_u 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 Al_u 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.

Online publication date: Wed, 29-Apr-2015

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