Optimized start-up strategies for elemental sulfur packing bioreactor achieving effective autotrophic denitrification.

Sun, Y-L; Zhang, J-Z; Ngo, HH; Shao, C-Y; Wei, W; Zhang, X-N; Guo, W; Cheng, H-Y; Wang, A-J

Optimized start-up strategies for elemental sulfur packing bioreactor achieving effective autotrophic denitrification.

Sun, Y-L Zhang, J-Z Ngo, HH Shao, C-Y Wei, W Zhang, X-N Guo, W

Cheng, H-Y Wang, A-J

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Sci Total Environ, 2024, 907, pp. 168036
Issue Date:: 2024-01-10

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Field	Value	Language
dc.contributor.author	Sun, Y-L
dc.contributor.author	Zhang, J-Z
dc.contributor.author	Ngo, HH
dc.contributor.author	Shao, C-Y
dc.contributor.author	Wei, W
dc.contributor.author	Zhang, X-N
dc.contributor.author	Guo, W https://orcid.org/0000-0001-5542-2858
dc.contributor.author	Cheng, H-Y
dc.contributor.author	Wang, A-J
dc.date.accessioned	2024-01-07T08:29:40Z
dc.date.available	2023-10-20
dc.date.available	2024-01-07T08:29:40Z
dc.date.issued	2024-01-10
dc.identifier.citation	Sci Total Environ, 2024, 907, pp. 168036
dc.identifier.issn	0048-9697
dc.identifier.issn	1879-1026
dc.identifier.uri	http://hdl.handle.net/10453/174058
dc.description.abstract	The start-up efficiency of the elemental sulfur packing bioreactor (S0PB) is constrained by the slow growth kinetics of autotrophic microorganisms, which is essentially optimized. This study aims to optimize start-up procedures and offer scientific guidance for the practical applications of S0PB. Through comparing the start-up efficiencies under various conditions related to inoculation, backwashing, and EBCT, it was found that these conditions did not significantly influence start-up time, but they did impact denitrification performance in detail. Using activated sludge as the inoculum was not recommended as the 2.5 ± 0.2 mg-N/L higher nitrite accumulation and 26.0 ± 5.1 % lower TN removal rate, compared to self-enrichment. Starting with a long-to-short EBCT (1 → 0.33 h) achieved higher nitrate removal of 11.5 ± 0.6 mg-N/L and eliminated nitrite accumulation compared to constantly short EBCT (0.33 h) conditions. Daily and postponed backwashing were suggested for long-to-short EBCT and constantly short EBCT start-up, respectively. Enrichment of Sulfurimonas was beneficial for the effective nitrite reduction process.
dc.format	Print-Electronic
dc.language	eng
dc.publisher	Elsevier
dc.relation.ispartof	Sci Total Environ
dc.relation.isbasedon	10.1016/j.scitotenv.2023.168036
dc.rights	info:eu-repo/semantics/embargoedAccess
dc.subject.classification	Environmental Sciences
dc.subject.mesh	Nitrites
dc.subject.mesh	Denitrification
dc.subject.mesh	Autotrophic Processes
dc.subject.mesh	Nitrates
dc.subject.mesh	Sulfur
dc.subject.mesh	Bioreactors
dc.subject.mesh	Nitrogen
dc.subject.mesh	Nitrates
dc.subject.mesh	Nitrites
dc.subject.mesh	Sulfur
dc.subject.mesh	Nitrogen
dc.subject.mesh	Bioreactors
dc.subject.mesh	Autotrophic Processes
dc.subject.mesh	Denitrification
dc.title	Optimized start-up strategies for elemental sulfur packing bioreactor achieving effective autotrophic denitrification.
dc.type	Journal Article
utslib.citation.volume	907
utslib.location.activity	Netherlands
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	embargoed	*
utslib.copyright.embargo	2025-10-01T00:00:00+1000Z
dc.date.updated	2024-01-07T08:29:39Z
pubs.publication-status	Published
pubs.volume	907

Abstract:

The start-up efficiency of the elemental sulfur packing bioreactor (S0PB) is constrained by the slow growth kinetics of autotrophic microorganisms, which is essentially optimized. This study aims to optimize start-up procedures and offer scientific guidance for the practical applications of S0PB. Through comparing the start-up efficiencies under various conditions related to inoculation, backwashing, and EBCT, it was found that these conditions did not significantly influence start-up time, but they did impact denitrification performance in detail. Using activated sludge as the inoculum was not recommended as the 2.5 ± 0.2 mg-N/L higher nitrite accumulation and 26.0 ± 5.1 % lower TN removal rate, compared to self-enrichment. Starting with a long-to-short EBCT (1 → 0.33 h) achieved higher nitrate removal of 11.5 ± 0.6 mg-N/L and eliminated nitrite accumulation compared to constantly short EBCT (0.33 h) conditions. Daily and postponed backwashing were suggested for long-to-short EBCT and constantly short EBCT start-up, respectively. Enrichment of Sulfurimonas was beneficial for the effective nitrite reduction process.

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http://hdl.handle.net/10453/174058