Influence of back mixing on the convective drying of residual sludges in a fixed bed

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• 作者：A. Lé ; onard ; E. Meneses ; E. Le Trong ; T. Salmon ; P. Marchot ; D. Toye ; M. Crine
• 关键词：Sludge ; Backmixing ; X-ray tomography ; Convective drying ; Fixed bed ; Waste treatment
• 刊名：Water Research
• 出版年：2008
• 出版时间：May 2008
• 年：2008
• 卷：42
• 期：10-11
• 页码：2671-2677
• 全文大小：564 K

文摘

The influence of a backmixing operation on the convective belt drying of two wastewater sludges was studied. The expansion of the sludge extrudates bed due to increasing additions of dry product was quantified by using X-ray tomography. This non-invasive technique was used to determine the bed porosity and the total exchange area available for heat and mass transfers, for increasing levels of backmixing. For a same drying flux, the expansion of the drying bed leads to higher drying rates, allowing a reduction of the total drying time. In this context, rheological properties of the sludges are key properties.