Coupling electro-dewatering and low-temperature air-drying for efficient dewatering of sludge

Abstract This study investigated the effects of electro-dewatering on subsequent low-temperature drying at various potentials and the characteristics of low-temperature air-drying sludge were explored through experiments and multi-physical modeling. Experimental results showed that the extracellular...

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Autores principales:	Hang Lv, Qiao Xiong, Daoguang Liu, Xu Wu
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/acd37f6eefa54262a2076a728b0805ca
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spelling	oai:doaj.org-article:acd37f6eefa54262a2076a728b0805ca2021-12-02T18:51:35ZCoupling electro-dewatering and low-temperature air-drying for efficient dewatering of sludge10.1038/s41598-021-98477-92045-2322https://doaj.org/article/acd37f6eefa54262a2076a728b0805ca2021-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-98477-9https://doaj.org/toc/2045-2322Abstract This study investigated the effects of electro-dewatering on subsequent low-temperature drying at various potentials and the characteristics of low-temperature air-drying sludge were explored through experiments and multi-physical modeling. Experimental results showed that the extracellular polymeric substance (EPS) content in the sludge was reduced during electro-dewatering process, even the species of organic matter was changed, as well as the dewatered cake tend to form many seepage channels, crack and a certain number of holes. These changes in the properties and structure were conducive to the subsequent low-temperature drying process. For air-drying process, the mass of the sludge cake variation was simulated and results were consistent with the experimental phenomenon. Firstly, the weight of the sludge cake was decreased approximately linearly with time, then tended to stable and reached the dewatering limitation finally. The applied higher electric field intensity (25 V cm−1) in the front-end electro-dewatering were conducive to promote water vapor diffusion activity in air-drying stage. Energy consumption and yield analysis results indicated that the combined technology has lower energy consumption and higher yield than that of directly low-temperature drying.Hang LvQiao XiongDaoguang LiuXu WuNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Hang Lv Qiao Xiong Daoguang Liu Xu Wu Coupling electro-dewatering and low-temperature air-drying for efficient dewatering of sludge
description	Abstract This study investigated the effects of electro-dewatering on subsequent low-temperature drying at various potentials and the characteristics of low-temperature air-drying sludge were explored through experiments and multi-physical modeling. Experimental results showed that the extracellular polymeric substance (EPS) content in the sludge was reduced during electro-dewatering process, even the species of organic matter was changed, as well as the dewatered cake tend to form many seepage channels, crack and a certain number of holes. These changes in the properties and structure were conducive to the subsequent low-temperature drying process. For air-drying process, the mass of the sludge cake variation was simulated and results were consistent with the experimental phenomenon. Firstly, the weight of the sludge cake was decreased approximately linearly with time, then tended to stable and reached the dewatering limitation finally. The applied higher electric field intensity (25 V cm−1) in the front-end electro-dewatering were conducive to promote water vapor diffusion activity in air-drying stage. Energy consumption and yield analysis results indicated that the combined technology has lower energy consumption and higher yield than that of directly low-temperature drying.
format	article
author	Hang Lv Qiao Xiong Daoguang Liu Xu Wu
author_facet	Hang Lv Qiao Xiong Daoguang Liu Xu Wu
author_sort	Hang Lv
title	Coupling electro-dewatering and low-temperature air-drying for efficient dewatering of sludge
title_short	Coupling electro-dewatering and low-temperature air-drying for efficient dewatering of sludge
title_full	Coupling electro-dewatering and low-temperature air-drying for efficient dewatering of sludge
title_fullStr	Coupling electro-dewatering and low-temperature air-drying for efficient dewatering of sludge
title_full_unstemmed	Coupling electro-dewatering and low-temperature air-drying for efficient dewatering of sludge
title_sort	coupling electro-dewatering and low-temperature air-drying for efficient dewatering of sludge
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/acd37f6eefa54262a2076a728b0805ca
work_keys_str_mv	AT hanglv couplingelectrodewateringandlowtemperatureairdryingforefficientdewateringofsludge AT qiaoxiong couplingelectrodewateringandlowtemperatureairdryingforefficientdewateringofsludge AT daoguangliu couplingelectrodewateringandlowtemperatureairdryingforefficientdewateringofsludge AT xuwu couplingelectrodewateringandlowtemperatureairdryingforefficientdewateringofsludge
_version_	1718377404011905024

Coupling electro-dewatering and low-temperature air-drying for efficient dewatering of sludge

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