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dc.contributor.authorGhanimeh, Sophia A.
dc.contributor.authorAl-Sanioura, Dana N.
dc.contributor.authorSaikaly, Pascal
dc.contributor.authorEl-Fadel, Mutasem
dc.date.accessioned2018-01-01T12:19:01Z
dc.date.available2018-01-01T12:19:01Z
dc.date.issued2017-12-07
dc.identifier.citationGhanimeh SA, Al-Sanioura DN, Saikaly PE, El-Fadel M (2018) Correlation between system performance and bacterial composition under varied mixing intensity in thermophilic anaerobic digestion of food waste. Journal of Environmental Management 206: 472–481. Available: http://dx.doi.org/10.1016/j.jenvman.2017.10.062.
dc.identifier.issn0301-4797
dc.identifier.doi10.1016/j.jenvman.2017.10.062
dc.identifier.urihttp://hdl.handle.net/10754/626589
dc.description.abstractThis study examines the stability and efficiency of thermophilic anaerobic digesters treating food waste under various mixing velocities (50–160 rpm). The results showed that high velocities (120 and 160 rpm) were harmful to the digestion process with 18–30% reduction in methane generation and 1.8 to 3.8 times increase in volatile fatty acids (VFA) concentrations, compared to mild mixing (50 and 80 rpm). Also, the removal rate of soluble COD dropped from 75 to 85% (at 50–80 rpm) to 20–59% (at 120–160 rpm). Similarly, interrupted mixing caused adverse impacts and led to near-failure conditions with excessive VFA accumulation (15.6 g l), negative removal rate of soluble COD and low methane generation (132 ml gVS). The best efficiency and stability were achieved under mild mixing (50 and 80 rpm). In particular, the 50 rpm stirring speed resulted in the highest methane generation (573 ml gVS). High-throughput sequencing of 16S rRNA genes revealed that the digesters were dominated by one bacterial genus (Petrotoga; phylym Thermotogae) at all mixing velocities except at 0 rpm, where the community was dominated by one bacterial genus (Anaerobaculum; phylum Synergistetes). The Petrotoga genus seems to have played a major role in the degradation of organic matter.
dc.description.sponsorshipThis research was supported by the National Council for Scientific Research of Lebanon (CNRS Grant number 02-11-12) and the American University of Beirut (AUB). Special thanks are extended to the US Agency for International Development for its support to AUB in acquiring the equipment used in the experimental program which was carried out at AUB laboratories. The microbial analysis was conducted at KAUST.
dc.publisherElsevier BV
dc.relation.urlhttp://www.sciencedirect.com/science/article/pii/S0301479717310599
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Journal of Environmental 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 Journal of Environmental Management, [206, , (2017-12-07)] DOI: 10.1016/j.jenvman.2017.10.062 . © 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/
dc.subject16S rRNA gene sequencing
dc.subjectFood waste
dc.subjectMixing
dc.subjectThermophilic anaerobic digestion
dc.titleCorrelation between system performance and bacterial composition under varied mixing intensity in thermophilic anaerobic digestion of food waste
dc.typeArticle
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentEnvironmental Science and Engineering Program
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)
dc.identifier.journalJournal of Environmental Management
dc.eprint.versionPost-print
dc.contributor.institutionDepartment of Civil & Environmental Engineering, Notre Dame University - Louaize, Lebanon
dc.contributor.institutionDepartment of Civil & Environmental Engineering, American University of Beirut, Lebanon
kaust.personSaikaly, Pascal
refterms.dateFOA2019-12-07T00:00:00Z
dc.date.published-online2017-12-07
dc.date.published-print2018-01


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