Abstract
Interactions between fine particles (0¿50 ¿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.
| Original language | English |
|---|---|
| Pages (from-to) | 142-149 |
| Journal | Colloids and Surfaces. A: Physicochemical and Engineering Aspects |
| Volume | 306 |
| Issue number | 1-3 |
| DOIs | |
| Publication status | Published - 2007 |
Keywords
- sequencing batch reactor
- waste-water treatment
- rheological properties
- activated-sludge
- uasb reactors
- sequential extraction
- molecular-mechanism
- calcium
- sewage
- suspensions
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