Effect evaluation of microplastics on activated sludge nitrification and denitrification.

Li, L; Song, K; Yeerken, S; Geng, S; Liu, D; Dai, Z; Xie, F; Zhou, X; Wang, Q

Effect evaluation of microplastics on activated sludge nitrification and denitrification.

Li, L Song, K Yeerken, S Geng, S Liu, D Dai, Z Xie, F Zhou, X Wang, Q

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Publisher:: ELSEVIER
Publication Type:: Journal Article
Citation:: The Science of the total environment, 2020, 707, pp. 135953
Issue Date:: 2020-03

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Field	Value	Language
dc.contributor.author	Li, L
dc.contributor.author	Song, K
dc.contributor.author	Yeerken, S
dc.contributor.author	Geng, S
dc.contributor.author	Liu, D
dc.contributor.author	Dai, Z
dc.contributor.author	Xie, F
dc.contributor.author	Zhou, X
dc.contributor.author	Wang, Q https://orcid.org/0000-0002-5744-2331
dc.date.accessioned	2020-12-21T05:58:11Z
dc.date.available	2019-12-03
dc.date.available	2020-12-21T05:58:11Z
dc.date.issued	2020-03
dc.identifier.citation	The Science of the total environment, 2020, 707, pp. 135953
dc.identifier.issn	1879-1026
dc.identifier.issn	1879-1026
dc.identifier.uri	http://hdl.handle.net/10453/144882
dc.description.abstract	A large amount of microplastics have entered conventional wastewater treatment plants, and their effects on activated sludge nitrification and denitrification are rarely reported. This study investigated the effects of microplastics on activated sludge nitrification and denitrification using five typical microplastics, namely, polyvinyl chloride (PVC), polypropylene, polyethylene, polystyrene, and polyester (PES) with concentrations of 0, 1000, 5000, and 10,000 particles/L. Results indicated that microplastics had negative effects on ammonia oxidation rate and low effect on nitrite oxidation rate during nitrification. The total inorganic nitrogen did not have much difference during 3 h nitrification under all the tested conditions. The addition of microplastics showed positive effects on denitrification, especially for PVC and PES at microplastic concentration of 5000 particles/L. Nitrification and denitrification did not evidently stop under all the tested conditions, indicating that the selected microplastic types and concentrations were not toxic to nitrification and denitrification within 3 h. The high abundance of PVC microplastics remarkably increased the nitrous oxide (N2O) emission during denitrification. The N2O emission in the test with 10,000 particle/L of PVC was 4.6times higher than the blank control. This study indicated that microplastics with <10,000 particle/L concentration in wastewater had low effects on nitrification and denitrification, whereas they had high effects on the N2O emission during denitrification.
dc.format	Print-Electronic
dc.language	eng
dc.publisher	ELSEVIER
dc.relation.ispartof	The Science of the total environment
dc.relation.isbasedon	10.1016/j.scitotenv.2019.135953
dc.rights	info:eu-repo/semantics/restrictedAccess
dc.subject.classification	Environmental Sciences
dc.subject.mesh	Nitrogen
dc.subject.mesh	Nitrous Oxide
dc.subject.mesh	Bioreactors
dc.subject.mesh	Sewage
dc.subject.mesh	Waste Disposal, Fluid
dc.subject.mesh	Denitrification
dc.subject.mesh	Nitrification
dc.subject.mesh	Microplastics
dc.subject.mesh	Bioreactors
dc.subject.mesh	Denitrification
dc.subject.mesh	Microplastics
dc.subject.mesh	Nitrification
dc.subject.mesh	Nitrogen
dc.subject.mesh	Nitrous Oxide
dc.subject.mesh	Sewage
dc.subject.mesh	Waste Disposal, Fluid
dc.title	Effect evaluation of microplastics on activated sludge nitrification and denitrification.
dc.type	Journal Article
utslib.citation.volume	707
utslib.location.activity	Netherlands
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
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
utslib.copyright.status	closed_access	*
dc.date.updated	2020-12-21T05:58:07Z
pubs.publication-status	Published
pubs.volume	707

Abstract:

A large amount of microplastics have entered conventional wastewater treatment plants, and their effects on activated sludge nitrification and denitrification are rarely reported. This study investigated the effects of microplastics on activated sludge nitrification and denitrification using five typical microplastics, namely, polyvinyl chloride (PVC), polypropylene, polyethylene, polystyrene, and polyester (PES) with concentrations of 0, 1000, 5000, and 10,000 particles/L. Results indicated that microplastics had negative effects on ammonia oxidation rate and low effect on nitrite oxidation rate during nitrification. The total inorganic nitrogen did not have much difference during 3 h nitrification under all the tested conditions. The addition of microplastics showed positive effects on denitrification, especially for PVC and PES at microplastic concentration of 5000 particles/L. Nitrification and denitrification did not evidently stop under all the tested conditions, indicating that the selected microplastic types and concentrations were not toxic to nitrification and denitrification within 3 h. The high abundance of PVC microplastics remarkably increased the nitrous oxide (N2O) emission during denitrification. The N2O emission in the test with 10,000 particle/L of PVC was 4.6times higher than the blank control. This study indicated that microplastics with <10,000 particle/L concentration in wastewater had low effects on nitrification and denitrification, whereas they had high effects on the N2O emission during denitrification.

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http://hdl.handle.net/10453/144882