Influence of C/N ratios on treatment performance and biomass production during co-culture of microalgae and activated sludge.

Dang, B-T; Nguyen, T-T; Ngo, HH; Pham, M-D-T; Le, LT; Nguyen, N-K-Q; Vo, T-D-H; Varjani, S; You, S-J; Lin, KA; Huynh, K-P-H; Bui, X-T

Influence of C/N ratios on treatment performance and biomass production during co-culture of microalgae and activated sludge.

Dang, B-T Nguyen, T-T Ngo, HH Pham, M-D-T Le, LT Nguyen, N-K-Q Vo, T-D-H Varjani, S You, S-J Lin, KA Huynh, K-P-H Bui, X-T

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Publisher:: Elsevier BV
Publication Type:: Journal Article
Citation:: Sci Total Environ, 2022, 837, pp. 155832
Issue Date:: 2022-09-01

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Field	Value	Language
dc.contributor.author	Dang, B-T
dc.contributor.author	Nguyen, T-T
dc.contributor.author	Ngo, HH
dc.contributor.author	Pham, M-D-T
dc.contributor.author	Le, LT
dc.contributor.author	Nguyen, N-K-Q
dc.contributor.author	Vo, T-D-H
dc.contributor.author	Varjani, S
dc.contributor.author	You, S-J
dc.contributor.author	Lin, KA
dc.contributor.author	Huynh, K-P-H
dc.contributor.author	Bui, X-T
dc.date.accessioned	2023-01-19T05:01:00Z
dc.date.available	2022-05-06
dc.date.available	2023-01-19T05:01:00Z
dc.date.issued	2022-09-01
dc.identifier.citation	Sci Total Environ, 2022, 837, pp. 155832
dc.identifier.issn	0048-9697
dc.identifier.issn	1879-1026
dc.identifier.uri	http://hdl.handle.net/10453/165230
dc.description.abstract	Novel phycosphere associated bacteria processes are being regarded as a potential and cost-effective strategy for controlling anthropogenic contaminants in wastewater treatment. However, the underlying concern with the process is its vulnerability to improper organic or nutrient intake. This study established a synergistic interaction between microalgae and activated sludge in a three-photobioreactor system (without external aeration) to understand how pollutants could be mitigated whilst simultaneously yielding biomass under different C/N ratios of 1:1, 5:1 and 10:1. The result showed that the superior biomass productivity was facilitated at a C/N ratio of 5:1 (106 mg L-1 d-1), and the high degradation rate constants (kCOD = 0.25 d-1, kTN = 0.29 d-1, kTP = 0.35 d-1) was approximated using a first-order kinetic model. The removal of pollutants was remarkably high, exceeding 90% (COD), 93% (TN), and 96% (TP). Nevertheless, the C/N ratio of 1:1 resulted in a threefold drop in biomass-specific growth rate (μ = 0.07 d-1). Microalgal assimilation, followed by bacterial denitrification, is the major pathway of removing total nitrogen when the C/N ratio exceeds 5:1. Activated sludge plays an important role in improving microalgae tolerance to high concentration of ammonia nitrogen and boosting nitrification (light phase) and denitrification (dark phase). The use of phycosphere associated bacteria could be a promising strategy for controlling nutrients pollution and other environmental considerations in wastewater.
dc.format	Print-Electronic
dc.language	eng
dc.publisher	Elsevier BV
dc.relation.ispartof	Sci Total Environ
dc.relation.isbasedon	10.1016/j.scitotenv.2022.155832
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject.classification	Environmental Sciences
dc.subject.mesh	Bacteria
dc.subject.mesh	Biomass
dc.subject.mesh	Coculture Techniques
dc.subject.mesh	Environmental Pollutants
dc.subject.mesh	Microalgae
dc.subject.mesh	Nitrogen
dc.subject.mesh	Sewage
dc.subject.mesh	Wastewater
dc.subject.mesh	Bacteria
dc.subject.mesh	Nitrogen
dc.subject.mesh	Environmental Pollutants
dc.subject.mesh	Coculture Techniques
dc.subject.mesh	Biomass
dc.subject.mesh	Sewage
dc.subject.mesh	Microalgae
dc.subject.mesh	Waste Water
dc.title	Influence of C/N ratios on treatment performance and biomass production during co-culture of microalgae and activated sludge.
dc.type	Journal Article
utslib.citation.volume	837
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	closed_access	*
dc.date.updated	2023-01-19T05:00:57Z
pubs.publication-status	Published
pubs.volume	837

Abstract:

Novel phycosphere associated bacteria processes are being regarded as a potential and cost-effective strategy for controlling anthropogenic contaminants in wastewater treatment. However, the underlying concern with the process is its vulnerability to improper organic or nutrient intake. This study established a synergistic interaction between microalgae and activated sludge in a three-photobioreactor system (without external aeration) to understand how pollutants could be mitigated whilst simultaneously yielding biomass under different C/N ratios of 1:1, 5:1 and 10:1. The result showed that the superior biomass productivity was facilitated at a C/N ratio of 5:1 (106 mg L-1 d-1), and the high degradation rate constants (kCOD = 0.25 d-1, kTN = 0.29 d-1, kTP = 0.35 d-1) was approximated using a first-order kinetic model. The removal of pollutants was remarkably high, exceeding 90% (COD), 93% (TN), and 96% (TP). Nevertheless, the C/N ratio of 1:1 resulted in a threefold drop in biomass-specific growth rate (μ = 0.07 d-1). Microalgal assimilation, followed by bacterial denitrification, is the major pathway of removing total nitrogen when the C/N ratio exceeds 5:1. Activated sludge plays an important role in improving microalgae tolerance to high concentration of ammonia nitrogen and boosting nitrification (light phase) and denitrification (dark phase). The use of phycosphere associated bacteria could be a promising strategy for controlling nutrients pollution and other environmental considerations in wastewater.

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http://hdl.handle.net/10453/165230