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Rheological study of sludge of membranes bioreactors for water treatment: protocol, limitations and link with the filtration

Günther, Jan and Anne-Archard, Dominique and Schetrite, Sylvie and Guigui, Christelle and Albasi, Claire and Lorain, Olivier and Cabassud, Corinne and Alliet-Gaubert, Marion Rheological study of sludge of membranes bioreactors for water treatment: protocol, limitations and link with the filtration. (2011) Récents Progrès en Génie des Procédés (n° 101). ISSN 1775-335X

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Abstract

The submerged membranes bio-reactors (sMBR) are more and more visible in the field of waste water treatment. The membrane fouling, that causes a drastic fall of the performances, can be limited by the application of a swarm of bubbles close to the membrane surfaces. This aeration as a major factor of the energetic expense of these processes, lets numerous studies to focus on the understanding of the mechanisms linking the bubbles swarm with fouling.. In this background, the rheological tools appeared to be useful to understand the behaviour of sludge under shear stress. In order to be sure to get significant results, we used three types of rheological measurements: i) the influence of shear rate on shear stress; ii) the influence of upward then downward stages of shear stress on viscosity; iii) the influence of the alternation of two stages of shear stress with implementation times identical to those of sMBR aeration. Besides a viscoplastic behaviour previously observed, a phenomenon of hysteresis appeared. The transparent upper plan used on the rheometer exhibited formations of aggregative structures “in roll”. Sludges of a sMBR using different sequencing of aeration are compared: the developed protocols enabled to differentiate those sludges, with characteristic results depending on mechanical applications. The aim of this work is, eventually, to propose some correlations between usual characteristics of the process and aeration operating parameters, in order to propose an aeration policy improving energetic performances.

Item Type:Article
Additional Information:Thanks to the Société Française de Génie des Procédés : http://www.sfgp.asso.fr
Audience (journal):National peer-reviewed journal
Audience (conference):International conference without published proceedings
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
French research institutions > Institut National de la Recherche Agronomique - INRA
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
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Deposited By: Marion ALLIET GAUBERT
Deposited On:04 Jun 2012 12:42

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