Experimental investigation of sludge dewatering for single- and double-drainage conditions with a vacuum negative pressure load at the bottom.

The moisture content of municipal sludge is relatively high, which increases the cost of sludge transportation and treatment. To reduce the volume of the sludge, sludge dewatering is needed. This paper proposes the theory of sludge dewatering and facilitates efficient and economical technology of sl...

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Autores principales:	Jiesheng Zhang, Yongzheng Qi, Xue Zhang, Guofu Zhang, Hang Yang, Firdawus Nattabi
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/5eac8707619e444ab48b95774e5a65b3
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spelling	oai:doaj.org-article:5eac8707619e444ab48b95774e5a65b32021-12-02T20:09:53ZExperimental investigation of sludge dewatering for single- and double-drainage conditions with a vacuum negative pressure load at the bottom.1932-620310.1371/journal.pone.0253806https://doaj.org/article/5eac8707619e444ab48b95774e5a65b32021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0253806https://doaj.org/toc/1932-6203The moisture content of municipal sludge is relatively high, which increases the cost of sludge transportation and treatment. To reduce the volume of the sludge, sludge dewatering is needed. This paper proposes the theory of sludge dewatering and facilitates efficient and economical technology of sludge dewatering. Sludge dewatering tests were carried out by using homemade rapid sludge dewatering devices. There were two groups of tests with single- and double-drainage conditions, and all test runs were loaded with a negative vacuum pressure at the bottom. During the experiments, the vacuum degree and the pore water pressure in the sludge were monitored in real time. After the experiments, the data were compared and analyzed. At the initial stage, the sludge dewatering extent and the sludge dewatering velocity for double-drainage conditions were much higher than those for single-drainage conditions. The vacuum occurring for single-drainage conditions lagged behind that for double-drainage conditions in the sludge. The value of vacuum degree for single-drainage conditions was lower than that for double-drainage conditions, and the vacuum attenuation for single-drainage conditions was considerable. The excess pore water pressure for double-drainage conditions dissipated faster than that for single-drainage conditions in the sludge. The pore water pressure for single-drainage conditions at the top and middle of the sludge layer first increased and then decreased in the early loading stage, resembling the Mandel effect. Overall, with a vacuum negative pressure load at the bottom, the sludge dewatering efficiency for double-drainage conditions was much higher than that for single-drainage conditions. This study provides an experimental and theoretical basis for engineering applications in the sludge treatment industry.Jiesheng ZhangYongzheng QiXue ZhangGuofu ZhangHang YangFirdawus NattabiPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 6, p e0253806 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jiesheng Zhang Yongzheng Qi Xue Zhang Guofu Zhang Hang Yang Firdawus Nattabi Experimental investigation of sludge dewatering for single- and double-drainage conditions with a vacuum negative pressure load at the bottom.
description	The moisture content of municipal sludge is relatively high, which increases the cost of sludge transportation and treatment. To reduce the volume of the sludge, sludge dewatering is needed. This paper proposes the theory of sludge dewatering and facilitates efficient and economical technology of sludge dewatering. Sludge dewatering tests were carried out by using homemade rapid sludge dewatering devices. There were two groups of tests with single- and double-drainage conditions, and all test runs were loaded with a negative vacuum pressure at the bottom. During the experiments, the vacuum degree and the pore water pressure in the sludge were monitored in real time. After the experiments, the data were compared and analyzed. At the initial stage, the sludge dewatering extent and the sludge dewatering velocity for double-drainage conditions were much higher than those for single-drainage conditions. The vacuum occurring for single-drainage conditions lagged behind that for double-drainage conditions in the sludge. The value of vacuum degree for single-drainage conditions was lower than that for double-drainage conditions, and the vacuum attenuation for single-drainage conditions was considerable. The excess pore water pressure for double-drainage conditions dissipated faster than that for single-drainage conditions in the sludge. The pore water pressure for single-drainage conditions at the top and middle of the sludge layer first increased and then decreased in the early loading stage, resembling the Mandel effect. Overall, with a vacuum negative pressure load at the bottom, the sludge dewatering efficiency for double-drainage conditions was much higher than that for single-drainage conditions. This study provides an experimental and theoretical basis for engineering applications in the sludge treatment industry.
format	article
author	Jiesheng Zhang Yongzheng Qi Xue Zhang Guofu Zhang Hang Yang Firdawus Nattabi
author_facet	Jiesheng Zhang Yongzheng Qi Xue Zhang Guofu Zhang Hang Yang Firdawus Nattabi
author_sort	Jiesheng Zhang
title	Experimental investigation of sludge dewatering for single- and double-drainage conditions with a vacuum negative pressure load at the bottom.
title_short	Experimental investigation of sludge dewatering for single- and double-drainage conditions with a vacuum negative pressure load at the bottom.
title_full	Experimental investigation of sludge dewatering for single- and double-drainage conditions with a vacuum negative pressure load at the bottom.
title_fullStr	Experimental investigation of sludge dewatering for single- and double-drainage conditions with a vacuum negative pressure load at the bottom.
title_full_unstemmed	Experimental investigation of sludge dewatering for single- and double-drainage conditions with a vacuum negative pressure load at the bottom.
title_sort	experimental investigation of sludge dewatering for single- and double-drainage conditions with a vacuum negative pressure load at the bottom.
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/5eac8707619e444ab48b95774e5a65b3
work_keys_str_mv	AT jieshengzhang experimentalinvestigationofsludgedewateringforsingleanddoubledrainageconditionswithavacuumnegativepressureloadatthebottom AT yongzhengqi experimentalinvestigationofsludgedewateringforsingleanddoubledrainageconditionswithavacuumnegativepressureloadatthebottom AT xuezhang experimentalinvestigationofsludgedewateringforsingleanddoubledrainageconditionswithavacuumnegativepressureloadatthebottom AT guofuzhang experimentalinvestigationofsludgedewateringforsingleanddoubledrainageconditionswithavacuumnegativepressureloadatthebottom AT hangyang experimentalinvestigationofsludgedewateringforsingleanddoubledrainageconditionswithavacuumnegativepressureloadatthebottom AT firdawusnattabi experimentalinvestigationofsludgedewateringforsingleanddoubledrainageconditionswithavacuumnegativepressureloadatthebottom
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Experimental investigation of sludge dewatering for single- and double-drainage conditions with a vacuum negative pressure load at the bottom.

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