Desorption Isotherms of Domestic Activated Sludge

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Abstract
Most of the studies dealing with water repartition within activated sludge focus essentially on the transition between free water and bound water; a transition which is important for mechanical dewatering investigations. But nowadays the drying of sludge is increasing and a better characterisation of the bound water is necessary. In this study a simple technique for the evaluation of sorption isotherms is presented. The experimental data obtained from this method indicate that flocculation and dewatering by filtration-compression (up to 10 bar) do not affect the distribution of the bound water. Otherwise usual models such as BET or GAB equations give a good representation of the desorption isotherms of activated sludge and allow an estimation of the adsorption heat of the water. The comparison of the experimental results (in terms of transition moisture content and specific area) with some data obtained from differential scanning calorimetry and porometry experiments shows a relatively good agreement between the different methods of evaluation and then validates the presented technique.

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