Impact of SRT on the performance of MBRs for the treatment of high strength landfill leachate

Handle URI:
http://hdl.handle.net/10754/626590
Title:
Impact of SRT on the performance of MBRs for the treatment of high strength landfill leachate
Authors:
El-Fadel, M.; Sleem, F.; Hashisho, J.; Saikaly, Pascal ( 0000-0001-7678-3986 ) ; Alameddine, I.; Ghanimeh, S.
Abstract:
This study examines the performance and fouling potential of flat sheet (FS) and hollow fiber (HF) membrane bioreactors (MBRs) during the treatment of high strength landfill leachate under varying solid retention times (SRT = 5–20 days). Mixed-liquor bacterial communities were examined over time using 16S rRNA gene sequence analysis in an attempt to define linkages between the system performance and the microbial community composition. Similarly, biofilm samples were collected at the end of each SRT to characterize the microbial communities that evolved on the surface of the FS and HF membranes. In general, both systems exhibited comparable removal efficiencies that dropped significantly as SRT was decreased down to 5 days. Noticeably, ammonia and nitrite oxidizing bacteria were not detected at the tested SRTs. This suggests that the nitrifiers were not enriched, possibly due to the high organic and ammonium content of the leachate that led to low TN and NH3 removal efficiency. The steady-state fouling rate of both membranes increased linearly with the decrease in SRT at an estimated factor of 1.1 and 1.2 for the FS- and HF-MBR, respectively, when the SRT was reduced from 15 to 10 days and from 10 to 5 days. Similar dominant genera were detected in both MBRs, including Pseudomonas, Aequorivita, Ulvibacter, Taibaiella, and Thermus. Aequorivita, Taibaiella; Thermus were the dominant genera in the biofilms. Hierarchical clustering and non-metric multidimensional scaling revealed that while the mixed liquor communities in the FS-MBR and HF-MBRs were dynamic, they clustered separately. Similarly, biofilm communities on the FS and HF membranes differed in the dynamic bacterial community structure, especially for the FS-MBR; however this was less dynamic than the mixed liquor community.
KAUST Department:
Biological and Environmental Sciences and Engineering (BESE) Division; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)
Citation:
El-Fadel M, Sleem F, Hashisho J, Saikaly PE, Alameddine I, et al. (2017) Impact of SRT on the performance of MBRs for the treatment of high strength landfill leachate. Waste Management. Available: http://dx.doi.org/10.1016/j.wasman.2017.12.003.
Publisher:
Elsevier BV
Journal:
Waste Management
Issue Date:
14-Dec-2017
DOI:
10.1016/j.wasman.2017.12.003
Type:
Article
ISSN:
0956-053X
Sponsors:
We are indebted to ACWA and GE Power & Water for providing the membranes and for their guidance during the installation of the experimental setup. Special thanks are extended to the Council for Development & Reconstruction for providing access to the Naameh landfill as well as to Laceco and the landfill management for facilitating and assisting during leachate sample collections. This study was partially funded through the Dar Al-Handasah (Shair & Partners) endowed Chair at the American University of Beirut and the Division of Biological and Environmental Sciences and Engineering at KAUST.
Additional Links:
http://www.sciencedirect.com/science/article/pii/S0956053X17309480
Appears in Collections:
Articles; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC); Biological and Environmental Sciences and Engineering (BESE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorEl-Fadel, M.en
dc.contributor.authorSleem, F.en
dc.contributor.authorHashisho, J.en
dc.contributor.authorSaikaly, Pascalen
dc.contributor.authorAlameddine, I.en
dc.contributor.authorGhanimeh, S.en
dc.date.accessioned2018-01-01T12:19:01Z-
dc.date.available2018-01-01T12:19:01Z-
dc.date.issued2017-12-14en
dc.identifier.citationEl-Fadel M, Sleem F, Hashisho J, Saikaly PE, Alameddine I, et al. (2017) Impact of SRT on the performance of MBRs for the treatment of high strength landfill leachate. Waste Management. Available: http://dx.doi.org/10.1016/j.wasman.2017.12.003.en
dc.identifier.issn0956-053Xen
dc.identifier.doi10.1016/j.wasman.2017.12.003en
dc.identifier.urihttp://hdl.handle.net/10754/626590-
dc.description.abstractThis study examines the performance and fouling potential of flat sheet (FS) and hollow fiber (HF) membrane bioreactors (MBRs) during the treatment of high strength landfill leachate under varying solid retention times (SRT = 5–20 days). Mixed-liquor bacterial communities were examined over time using 16S rRNA gene sequence analysis in an attempt to define linkages between the system performance and the microbial community composition. Similarly, biofilm samples were collected at the end of each SRT to characterize the microbial communities that evolved on the surface of the FS and HF membranes. In general, both systems exhibited comparable removal efficiencies that dropped significantly as SRT was decreased down to 5 days. Noticeably, ammonia and nitrite oxidizing bacteria were not detected at the tested SRTs. This suggests that the nitrifiers were not enriched, possibly due to the high organic and ammonium content of the leachate that led to low TN and NH3 removal efficiency. The steady-state fouling rate of both membranes increased linearly with the decrease in SRT at an estimated factor of 1.1 and 1.2 for the FS- and HF-MBR, respectively, when the SRT was reduced from 15 to 10 days and from 10 to 5 days. Similar dominant genera were detected in both MBRs, including Pseudomonas, Aequorivita, Ulvibacter, Taibaiella, and Thermus. Aequorivita, Taibaiella; Thermus were the dominant genera in the biofilms. Hierarchical clustering and non-metric multidimensional scaling revealed that while the mixed liquor communities in the FS-MBR and HF-MBRs were dynamic, they clustered separately. Similarly, biofilm communities on the FS and HF membranes differed in the dynamic bacterial community structure, especially for the FS-MBR; however this was less dynamic than the mixed liquor community.en
dc.description.sponsorshipWe are indebted to ACWA and GE Power & Water for providing the membranes and for their guidance during the installation of the experimental setup. Special thanks are extended to the Council for Development & Reconstruction for providing access to the Naameh landfill as well as to Laceco and the landfill management for facilitating and assisting during leachate sample collections. This study was partially funded through the Dar Al-Handasah (Shair & Partners) endowed Chair at the American University of Beirut and the Division of Biological and Environmental Sciences and Engineering at KAUST.en
dc.publisherElsevier BVen
dc.relation.urlhttp://www.sciencedirect.com/science/article/pii/S0956053X17309480en
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Waste Management. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Waste Management, [, , (2017-12-14)] DOI: 10.1016/j.wasman.2017.12.003 . © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectFlat sheeten
dc.subjectHollow fiberen
dc.subjectLandfill leachateen
dc.subjectMembrane bioreactoren
dc.subject16S rRNA gene sequencingen
dc.titleImpact of SRT on the performance of MBRs for the treatment of high strength landfill leachateen
dc.typeArticleen
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.contributor.departmentEnvironmental Science and Engineering Programen
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)en
dc.identifier.journalWaste Managementen
dc.eprint.versionPost-printen
dc.contributor.institutionDepartment of Civil and Environmental Engineering, American University of Beirut, Lebanonen
dc.contributor.institutionDepartment of Civil and Environmental Engineering, Notre Dame University-Louaize, Lebanonen
kaust.authorSaikaly, Pascalen
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