Performance optimization of a chitosan/anammox reactor in nitrogen removal from synthetic wastewater

Mojiri, A; Zhou, JL; Ratnaweera, H; Ohashi, A; Ozaki, N; Aoi, Y; Vakili, M; Kindaichi, T

Performance optimization of a chitosan/anammox reactor in nitrogen removal from synthetic wastewater

Mojiri, A Zhou, JL Ratnaweera, H Ohashi, A Ozaki, N Aoi, Y Vakili, M Kindaichi, T

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Publisher:: ELSEVIER SCI LTD
Publication Type:: Journal Article
Citation:: Journal of Environmental Chemical Engineering, 2021, 9, (3)
Issue Date:: 2021-06-01

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Field	Value	Language
dc.contributor.author	Mojiri, A
dc.contributor.author	Zhou, JL
dc.contributor.author	Ratnaweera, H
dc.contributor.author	Ohashi, A
dc.contributor.author	Ozaki, N
dc.contributor.author	Aoi, Y
dc.contributor.author	Vakili, M
dc.contributor.author	Kindaichi, T
dc.date.accessioned	2022-05-20T07:29:04Z
dc.date.available	2022-05-20T07:29:04Z
dc.date.issued	2021-06-01
dc.identifier.citation	Journal of Environmental Chemical Engineering, 2021, 9, (3)
dc.identifier.issn	2213-2929
dc.identifier.issn	2213-3437
dc.identifier.uri	http://hdl.handle.net/10453/157565
dc.description.abstract	Anaerobic ammonia oxidation (anammox) is an environmentally friendly, cost-effective, and biological method for nitrogen treatment from aqueous solutions. However, slow growth rate, negative effects of high concentration of nitrite, ammonia and other pollutants (such as metals) on anammox activity are the main drawbacks of using anammox. Thus, in this study, anammox was attached on chitosan to improve anammox performance. Two reactors comprising chitosan and anammox bacteria (first reactor, chitosan/anammox) and solely anammox (second reactor, control) were run for 73 d. The nitrogen loading rate (NLR) varied from 2 to 14 (gN/L/d), while the nitrogen concentration varied from 80 to 700 mg/L. The chitosan/anammox reactor showed a better performance than the sole anammox (control), with respective maximum abatement values of ammonia (NH4+), nitrite (NO2-), and total nitrogen (TN) of 90.8%, 83.5%, and 81.7% on days 20-25 under a NLR of 8-10 kgTN/(m3 d). Response surface methodology (RSM) was employed to optimize the performance of both reactors, and a reasonable R2 value showed that the RSM well optimized the performance of the reactors. After finding the optimum performance conditions for both reactors, Fe and Cu (0.5-7.0 mg/L) were added to the influent to monitor the effects of metals on the performance of both reactors. The performance of both reactors decreased to 0% following the addition of 7.0 (first reactor) and 6.5 (second reactor) mg/L Cu and Fe, respectively. This indicated that chitosan not only enhanced nitrogen removal by anammox but also improved the resistance of anammox to metals.
dc.language	English
dc.publisher	ELSEVIER SCI LTD
dc.relation.ispartof	Journal of Environmental Chemical Engineering
dc.relation.isbasedon	10.1016/j.jece.2021.105252
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	0306 Physical Chemistry (incl. Structural), 0904 Chemical Engineering, 0907 Environmental Engineering
dc.title	Performance optimization of a chitosan/anammox reactor in nitrogen removal from synthetic wastewater
dc.type	Journal Article
utslib.citation.volume	9
utslib.for	0306 Physical Chemistry (incl. Structural)
utslib.for	0904 Chemical Engineering
utslib.for	0907 Environmental Engineering
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	open_access	*
dc.date.updated	2022-05-20T07:29:01Z
pubs.issue	3
pubs.publication-status	Published
pubs.volume	9
utslib.citation.issue	3

Abstract:

Anaerobic ammonia oxidation (anammox) is an environmentally friendly, cost-effective, and biological method for nitrogen treatment from aqueous solutions. However, slow growth rate, negative effects of high concentration of nitrite, ammonia and other pollutants (such as metals) on anammox activity are the main drawbacks of using anammox. Thus, in this study, anammox was attached on chitosan to improve anammox performance. Two reactors comprising chitosan and anammox bacteria (first reactor, chitosan/anammox) and solely anammox (second reactor, control) were run for 73 d. The nitrogen loading rate (NLR) varied from 2 to 14 (gN/L/d), while the nitrogen concentration varied from 80 to 700 mg/L. The chitosan/anammox reactor showed a better performance than the sole anammox (control), with respective maximum abatement values of ammonia (NH4+), nitrite (NO2-), and total nitrogen (TN) of 90.8%, 83.5%, and 81.7% on days 20-25 under a NLR of 8-10 kgTN/(m3 d). Response surface methodology (RSM) was employed to optimize the performance of both reactors, and a reasonable R2 value showed that the RSM well optimized the performance of the reactors. After finding the optimum performance conditions for both reactors, Fe and Cu (0.5-7.0 mg/L) were added to the influent to monitor the effects of metals on the performance of both reactors. The performance of both reactors decreased to 0% following the addition of 7.0 (first reactor) and 6.5 (second reactor) mg/L Cu and Fe, respectively. This indicated that chitosan not only enhanced nitrogen removal by anammox but also improved the resistance of anammox to metals.

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