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The Mechanism of Activated Sludge Flocculation under Al3+ Dosin

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Abstract:

The mechanism governing activated sludge flocculation under Al3+ dosing was studied in this paper. Activated sludge was cultivated in sequencing batch reactors (SBR) at 22°C. Batch dosages of Al3+ were 0.00, 0.125, 0.5, 1 and 1.5meq/L respectively, and continuous dosage was 0.1meq/L. As batch dosage increased, the total interaction energy, zeta potential and turbidity tended to decline, which suggested that batch dosing promoted sludge flocculation. Under the equivalent dose, the zeta potential of continuous dosing was higher, while the LB-EPS content showed the opposite tendency and turbidity reduction was similar. Both batch and continuous dosing promoted flocculation performance: in terms of interaction energy, batch dosing was more effective; while in terms of EPS, it was on the contrary.

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Periodical:

Applied Mechanics and Materials (Volumes 675-677)

Pages:

106-110

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.675-677.106

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Cite this paper

Online since:

October 2014

Authors:

Wan Lin Zheng, A Sheng Cao, Yue Wen*, Hai Rong Chen, Qi Zhou

Keywords:

Activated Sludge, Aluminum Ion, Extracellular Polymeric Substances, Flocculation, Interaction Energy

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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