Mathematical modelling of water sorption isotherms and thermodynamic properties of wastewater sewage sludge

Heavy metals in wastewater and sewage sludge from selected municipal treatment plants in Eastern cape province, South Africa

Zhipan Gu, Jichun Yang, Leren Tao, Fanhan Liu and Ye Zhang

International Journal of Low-Carbon Technologies, 2021, vol. 16, issue 4, 1150-1163

Abstract: This study was aimed at determining wastewater sewage sludge moisture sorption characteristics using a static gravimetric method at 303 K, 313 K and 323 K. Eleven mathematical models were adopted to simulate the experimental data, and the optimal model was analysed. The indexes included the net isosteric heat of adsorption (qst), differential entropy (△S), spreading pressure (π), net integral enthalpy (qin) and net integral entropy (△Sin) to evaluate the thermodynamic properties of the sludge. The isotherm curves exhibited type II behaviour according to the Brunauer--Emmett--Teller classification. The sorption isotherm fitting showed that the Gugghenheim--Anderson--de Boer model was able to reproduce the equilibrium moisture content evolution with water activity for a moisture range varying from 6% to 89% (0.991

Keywords: wastewater sewage sludge; water sorption isotherms; equilibrium moisture content; mathematical models; microscopic analysis (search for similar items in EconPapers)
Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:oup:ijlctc:v:16:y:2021:i:4:p:1150-1163.

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