Influence of Al3+ Addition on the Flocculation and Sedimentation of Thermophilic Activated Sludge

DOI

10.2991/aeece-15.2015.161How to use a DOI?

Keywords

Thermophilic activated sludge, Flocculation, Sedimentation, Aluminum ion

Abstract

In this study, the flocculation and sedimentation performance of thermophilic activated sludge with single and multiple dosing of trivalent aluminum (Al3+) were studied. The thermophilic activated sludge samples were cultivated in sequencing batch reactors at 55 °C. The dosages of Al3+ were 0.125, 0.5, 1.0, 1.5, and 2.0 meq/L for single dosing, and 0.1 meq/L for multiple dosing. The experimental results indicated that single Al3+ dosing could enhance sludge flocculation, but deteriorate sedimentation. While multiple dosing, which allows sufficient time for sludge restructuring and floc aggregation, could optimize flocculation and maintain sedimentation simultaneously. LB-EPS played a more important role than interaction energy in the improvement. Although the responding of zeta potential was insignificant, better flocculability and settleability were achieved through Al3+ dosing.

Copyright

© 2015, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Xue Zhang
AU  - Yue Wen
AU  - Asheng Cao
PY  - 2015/09
DA  - 2015/09
TI  - Influence of Al3+ Addition on the Flocculation and Sedimentation of Thermophilic Activated Sludge
BT  - Proceedings of the International Conference on Advances in Energy, Environment and Chemical Engineering
PB  - Atlantis Press
SP  - 789
EP  - 792
SN  - 2352-5401
UR  - https://doi.org/10.2991/aeece-15.2015.161
DO  - 10.2991/aeece-15.2015.161
ID  - Zhang2015/09
ER  -