Mathematical Modeling of Thin-layer Infrared Drying of Dewatered Municipal Sewage Sludge (DWMSS)

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• 作者：Yuenan Zhou ; Yiying Jin ; ^{jinyy@tsinghua.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：sludge cake ; thin-layer drying ; Hasibuan and Daud model ; moisture diffusivity ; activation energy
• 刊名：Procedia Environmental Sciences
• 出版年：2016
• 出版时间：2016
• 年：2016
• 卷：31
• 期：Complete
• 页码：758-766
• 全文大小：437 K

文摘

In this paper, thin-layer infrared drying behavior of dewatered municipal sewage sludge was systematically investigated. Drying experiments were conducted at drying temperatures from 65 to 135̊C and the thickness of sludge cake from 2 to 10 mm. Twenty thin-layer drying kinetic models were selected to model the drying process, and model parameters were evaluated by nonlinear regression method, of which, two different nonlinear error functions (R², RSS) were examined to gauge the goodness-of-fit. The experimental results manifested that Hasibuan and Daud model is the best suitable model with highest R² values from 0.99951 to 0.99996 and lowest RSS values from 3.3×10^-4 to 0.00117 under our experimental conditions; drying rate increased with increase in drying temperature and decrease in the thickness of sludge cake; effective moisture diffusivity notably increased as drying temperature increased; activation energy for drying process was 34.9211 kJ/mol.