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Article

Measurement and Modelling of Moisture Distribution and Water Binding Energy of Dredged Sludge

1
College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
2
Zhejiang Design Institute of Water Conservancy and Hydro-Electric Power, Hangzhou 310002, China
3
Zhejiang Tongji Vocational College of Science and Technology, Hangzhou 311231, China
*
Author to whom correspondence should be addressed.
Water 2020, 12(12), 3395; https://doi.org/10.3390/w12123395
Received: 11 October 2020 / Revised: 27 November 2020 / Accepted: 1 December 2020 / Published: 2 December 2020
(This article belongs to the Special Issue Circle Sustainability of Wastewater and Sludge Treatment)
The dewatering of dredged sludge is a critical step in the minimization and reutilization of this solid waste. However, there is a lack of available literature on the fundamental drying characteristics of dredged sludge. In this work, two kinds of typical sludge dredged from an urban watercourse were tested by low-field NMR to investigate the water distribution in sludge and it was found that water contained in sludge can be classified into three categories: free water, capillary water and bound water. In addition, a novel model was proposed based on the Lennard-Jones equation and Kelvin law to quantitatively evaluate the binding energy during drying. Further, the model results were experimentally verified by thermogravimetry differential thermal analysis (TG-DTA). Results show that the trends of the model are consistent with the experimental values and the gradient of energy consumption during dehydration can be divided into three main stages. In stage 1, the total energy required for dewatering equals the latent heat of free water. In stage 2, binding energy reaches dozens to hundreds of kJ/kg accounting for capillary action. In stage 3, binding energy increases steeply reaching almost thousands of kJ/kg due to intermolecular interactions. All the discovered aspects could improve the management and disposal of dredged sludge from an energy cost perspective. View Full-Text
Keywords: drying; dredged sludge; moisture distribution; water binding energy; LF-NMR drying; dredged sludge; moisture distribution; water binding energy; LF-NMR
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MDPI and ACS Style

Mao, F.; Zhao, Y.; Zhang, Y.; Chen, Z.; Yin, L. Measurement and Modelling of Moisture Distribution and Water Binding Energy of Dredged Sludge. Water 2020, 12, 3395. https://doi.org/10.3390/w12123395

AMA Style

Mao F, Zhao Y, Zhang Y, Chen Z, Yin L. Measurement and Modelling of Moisture Distribution and Water Binding Energy of Dredged Sludge. Water. 2020; 12(12):3395. https://doi.org/10.3390/w12123395

Chicago/Turabian Style

Mao, Feiyan; Zhao, Yingjie; Zhang, Yiping; Chen, Zhou; Yin, Lu. 2020. "Measurement and Modelling of Moisture Distribution and Water Binding Energy of Dredged Sludge" Water 12, no. 12: 3395. https://doi.org/10.3390/w12123395

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