Critical flux on a submerged membrane bioreactor for nitrification of source separated urine

Jiang, J; Phuntsho, S; Pathak, N; Wang, Q; Cho, J; Shon, HK

Critical flux on a submerged membrane bioreactor for nitrification of source separated urine

Jiang, J Phuntsho, S

Pathak, N Wang, Q

Cho, J Shon, HK

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Publisher:: ELSEVIER
Publication Type:: Journal Article
Citation:: Process Safety and Environmental Protection, 2021, 153, pp. 518-526
Issue Date:: 2021-09-01

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Field	Value	Language
dc.contributor.author	Jiang, J
dc.contributor.author	Phuntsho, S https://orcid.org/0000-0002-3917-3916
dc.contributor.author	Pathak, N
dc.contributor.author	Wang, Q https://orcid.org/0000-0002-5744-2331
dc.contributor.author	Cho, J
dc.contributor.author	Shon, HK
dc.date.accessioned	2023-03-27T02:25:17Z
dc.date.available	2023-03-27T02:25:17Z
dc.date.issued	2021-09-01
dc.identifier.citation	Process Safety and Environmental Protection, 2021, 153, pp. 518-526
dc.identifier.issn	0957-5820
dc.identifier.issn	1744-3598
dc.identifier.uri	http://hdl.handle.net/10453/168536
dc.description.abstract	Membrane fouling is the biggest challenge in membrane based technology operation. Studies on critical flux mainly focused on membrane bioreactor for municipal wastewater and/or greywater treatment, which can significantly differ from the ultrafiltration membrane bioreactor (UF-MBRs) to treat source separated urine. In this work, the inhibitory factors on nitrifying bacteria activity were investigated for fast acclimation of nitrifying bacteria with high ammonium concentration and optimization of a high-rate partial nitrification MBR. The maximum nitrification rate of 447 ± 50 mgN L–1 d–1 was achieved when concentration of ammonia in feed urine is approximately 4006.3 ± 225.8 mg N L–1 by maintaining desired pH around 6.2 and FA concentrations below 0.5 mgL−1. Furthermore, for the first time, the impact of different operational and filtration conditions (i.e. aeration intensity, filtration method, imposed flux, intermittent relaxation, biomass concentration) on the reversibility of membrane fouling was carried out for enhancement of membrane flux and fouling mitigation. Fouling mechanisms for minor irreversible fouling observed under sub-critical condition were pore blocking and polarization. To mitigate membrane fouling, the UF module with effective membrane surface area of 0.02 m2 is recommended to be operated at the aeration intensity of 0.4 m3 h−1, intermittent relaxation of 15 min, biomass concentration of 3.5 g L−1.
dc.language	English
dc.publisher	ELSEVIER
dc.relation	The Korea Foundation
dc.relation	The Korea Foundation
dc.relation	College of Science and Technology, Bhutan (under Royal University of Bhutan)
dc.relation.ispartof	Process Safety and Environmental Protection
dc.relation.isbasedon	10.1016/j.psep.2021.07.039
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0102 Applied Mathematics, 0904 Chemical Engineering, 0911 Maritime Engineering, 0914 Resources Engineering and Extractive Metallurgy
dc.subject.classification	Chemical Engineering
dc.subject.classification	Strategic, Defence & Security Studies
dc.title	Critical flux on a submerged membrane bioreactor for nitrification of source separated urine
dc.type	Journal Article
utslib.citation.volume	153
utslib.for	0102 Applied Mathematics
utslib.for	0904 Chemical Engineering
utslib.for	0911 Maritime Engineering
utslib.for	0914 Resources Engineering and Extractive Metallurgy
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	2023-03-27T02:25:16Z
pubs.publication-status	Published
pubs.volume	153

Abstract:

Membrane fouling is the biggest challenge in membrane based technology operation. Studies on critical flux mainly focused on membrane bioreactor for municipal wastewater and/or greywater treatment, which can significantly differ from the ultrafiltration membrane bioreactor (UF-MBRs) to treat source separated urine. In this work, the inhibitory factors on nitrifying bacteria activity were investigated for fast acclimation of nitrifying bacteria with high ammonium concentration and optimization of a high-rate partial nitrification MBR. The maximum nitrification rate of 447 ± 50 mgN L–1 d–1 was achieved when concentration of ammonia in feed urine is approximately 4006.3 ± 225.8 mg N L–1 by maintaining desired pH around 6.2 and FA concentrations below 0.5 mgL−1. Furthermore, for the first time, the impact of different operational and filtration conditions (i.e. aeration intensity, filtration method, imposed flux, intermittent relaxation, biomass concentration) on the reversibility of membrane fouling was carried out for enhancement of membrane flux and fouling mitigation. Fouling mechanisms for minor irreversible fouling observed under sub-critical condition were pore blocking and polarization. To mitigate membrane fouling, the UF module with effective membrane surface area of 0.02 m2 is recommended to be operated at the aeration intensity of 0.4 m3 h−1, intermittent relaxation of 15 min, biomass concentration of 3.5 g L−1.

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http://hdl.handle.net/10453/168536