Aged refuse enhances anaerobic digestion of waste activated sludge.

Zhao, J; Gui, L; Wang, Q; Liu, Y; Wang, D; Ni, B-J; Li, X; Xu, R; Zeng, G; Yang, Q

Aged refuse enhances anaerobic digestion of waste activated sludge.

Zhao, J Gui, L Wang, Q

Liu, Y

Wang, D Ni, B-J Li, X Xu, R Zeng, G Yang, Q

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Publisher:: PERGAMON-ELSEVIER SCIENCE LTD
Publication Type:: Journal Article
Citation:: Water Res, 2017, 123, pp. 724-733
Issue Date:: 2017-10-15

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Field	Value	Language
dc.contributor.author	Zhao, J
dc.contributor.author	Gui, L
dc.contributor.author	Wang, Q https://orcid.org/0000-0002-5744-2331
dc.contributor.author	Liu, Y https://orcid.org/0000-0001-6677-7961
dc.contributor.author	Wang, D
dc.contributor.author	Ni, B-J
dc.contributor.author	Li, X
dc.contributor.author	Xu, R
dc.contributor.author	Zeng, G
dc.contributor.author	Yang, Q
dc.date.accessioned	2023-03-23T22:45:23Z
dc.date.available	2017-07-13
dc.date.available	2023-03-23T22:45:23Z
dc.date.issued	2017-10-15
dc.identifier.citation	Water Res, 2017, 123, pp. 724-733
dc.identifier.issn	0043-1354
dc.identifier.issn	1879-2448
dc.identifier.uri	http://hdl.handle.net/10453/168259
dc.description.abstract	In this work, a low-cost alternative approach (i.e., adding aged refuse (AR) into waste activated sludge) to significantly enhance anaerobic digestion of sludge was reported. Experimental results showed that with the addition dosage of AR increasing from 0 to 400 mg/g dry sludge soluble chemical oxygen demand (COD) increased from 1150 to 5240 mg/L at the digestion time of 5 d, while the maximal production of volatile fatty acids (VFA) increased from 82.6 to 183.9 mg COD/g volatile suspended solids. Although further increase of AR addition decreased the concentrations of both soluble COD and VFA, their contents in these systems with AR addition at any concentration investigated were still higher than those in the blank, which resulted in higher methane yields in these systems. Mechanism studies revealed that pertinent addition of AR promoted solubilization, hydrolysis, and acidogenesis processes and did not affect methanogenesis significantly. It was found that varieties of enzymes and anaerobes in AR were primary reason for the enhancement of anaerobic digestion. Humic substances in AR benefited hydrolysis and acidogenesis but inhibited methanogenesis. The effect of heavy metals in AR on sludge anaerobic digestion was dosage dependent. Sludge anaerobic digestion was enhanced by appropriate amounts of heavy metals but inhibited by excessive amounts of heavy metals. The relative abundances of microorganisms responsible for sludge hydrolysis and acidogenesis were also observed to be improved in the system with AR addition, which was consistent with the performance of anaerobic digestion.
dc.format	Print-Electronic
dc.language	eng
dc.publisher	PERGAMON-ELSEVIER SCIENCE LTD
dc.relation.ispartof	Water Res
dc.relation.isbasedon	10.1016/j.watres.2017.07.026
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject.classification	Environmental Engineering
dc.subject.mesh	Anaerobiosis
dc.subject.mesh	Bacteria, Anaerobic
dc.subject.mesh	Bioreactors
dc.subject.mesh	Fatty Acids, Volatile
dc.subject.mesh	Garbage
dc.subject.mesh	Methane
dc.subject.mesh	Sewage
dc.subject.mesh	Bacteria, Anaerobic
dc.subject.mesh	Methane
dc.subject.mesh	Fatty Acids, Volatile
dc.subject.mesh	Bioreactors
dc.subject.mesh	Sewage
dc.subject.mesh	Garbage
dc.subject.mesh	Anaerobiosis
dc.subject.mesh	Anaerobiosis
dc.subject.mesh	Bacteria, Anaerobic
dc.subject.mesh	Bioreactors
dc.subject.mesh	Fatty Acids, Volatile
dc.subject.mesh	Garbage
dc.subject.mesh	Methane
dc.subject.mesh	Sewage
dc.title	Aged refuse enhances anaerobic digestion of waste activated sludge.
dc.type	Journal Article
utslib.citation.volume	123
utslib.location.activity	England
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
utslib.copyright.status	closed_access	*
dc.date.updated	2023-03-23T22:45:22Z
pubs.publication-status	Published
pubs.volume	123

Abstract:

In this work, a low-cost alternative approach (i.e., adding aged refuse (AR) into waste activated sludge) to significantly enhance anaerobic digestion of sludge was reported. Experimental results showed that with the addition dosage of AR increasing from 0 to 400 mg/g dry sludge soluble chemical oxygen demand (COD) increased from 1150 to 5240 mg/L at the digestion time of 5 d, while the maximal production of volatile fatty acids (VFA) increased from 82.6 to 183.9 mg COD/g volatile suspended solids. Although further increase of AR addition decreased the concentrations of both soluble COD and VFA, their contents in these systems with AR addition at any concentration investigated were still higher than those in the blank, which resulted in higher methane yields in these systems. Mechanism studies revealed that pertinent addition of AR promoted solubilization, hydrolysis, and acidogenesis processes and did not affect methanogenesis significantly. It was found that varieties of enzymes and anaerobes in AR were primary reason for the enhancement of anaerobic digestion. Humic substances in AR benefited hydrolysis and acidogenesis but inhibited methanogenesis. The effect of heavy metals in AR on sludge anaerobic digestion was dosage dependent. Sludge anaerobic digestion was enhanced by appropriate amounts of heavy metals but inhibited by excessive amounts of heavy metals. The relative abundances of microorganisms responsible for sludge hydrolysis and acidogenesis were also observed to be improved in the system with AR addition, which was consistent with the performance of anaerobic digestion.

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http://hdl.handle.net/10453/168259