Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 306, Issue 1-3, Pages 142-149Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2007.04.033
Keywords
Ca2+; Na+; sieved anaerobic granular sludge; viscosity; zeta potential; bridging; aggregation
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Interactions between fine particles (0-50 mu m) of anaerobic granular sludge were investigated by studying the effect of Na+ or Ca2+ supply on the evolution of the zeta potential and viscosity of granular sludge suspensions. In the Na+ or Ca2+ concentration range investigated, the Na+ addition affected only slightly the evolution of the viscosity of fine particles of an anaerobic granular suspension. In contrast, Ca2+ addition strongly modified the evolution of the viscosity of the studied anaerobic granular sludge suspension. The use of rheology combined with zeta potential measurements clearly described the physico-chemical interactions between small anaerobic granules and especially the importance of aggregation phenomena that occur between fine anaerobic particles under Ca2+ addition. The positive effect of Ca2+ on the aggregation of non-fed fine anaerobic granular sludge is likely to induce the formation of bigger particles and thus, prevent their wash-out from anaerobic bioreactors. (C) 2007 Elsevier B.V. All rights reserved.
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