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Critical review of EPS production, synthesis and composition for sludge flocculation

Journal of Environmental Sciences 2018年第4期30卷 225-245页

作者： Klai Nouha Ram Saurabh Kumar sellamuthu balasubramanian Rajeshwar Dayal Tyagi Universite du Quebec Institut national de la Recherche Scientifique Centre Eau Terre & Environnement 490 de la CouronneQuebec G1K 9A9 Canada Institut Armand-Frappier 531 boul. des Prairies Laval Quebec H7V 1B7 Canada

Extracellular polymeric substances（EPS） produced by microorganisms represent biological macromolecules with unfathomable potentials and they are required to be explored further for their potential application as a bioflocculant in various wastewater sludge treatment. Although several studies already exist on biosynthetic pathways of different classical biopolymers like alginate and xanthan, no dedicated studies are available for EPS in sludge. This review highlights the EPS composition, functionality, and biodegradability for its potential use as a carbon source for production of other metabolites. Furthermore, the effect of various extraction methods（physical and chemical） on compositional, structural, physical and functional properties of microbial EPS has been addressed. The vital knowledge of the effect of extraction method on various important attributes of EPS can help to choose the suitable extraction method depending upon the intended use of EPS. The possible use of different molecular biological techniques for enhanced production of desired EPS was summarized.

关键词： Extracellular polymeric substances Metabolic pathways Extraction methods Flocculation properties

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ORIGINAL ARTICLE Dynamics of bacterial community at varying sludge retention time within membrane bioreactor treating synthetic hospital wastewater

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Systems Microbiology and Biomanufacturing 2021年第4期1卷 471-482页

作者： Bhagyashree Tiwari balasubramanian sellamuthu Sarah Piche-Choquette Patrick Drogui Rajeshwar Dayal Tyagi Marc Antoine Vaudreuil Sebastien Sauve Gerardo Buelna Rino Dube INRS-Eau Terre et EnvironnementQuebecQC G1K9A9Canada Departement de Radiologie Radio-Oncologie et Medecine NucleaireCentre Hospitalier de l’Universite de MontrealMontrealQC H2X 0A9Canada INRS-Institut Armand-Frappier LavalQC H7V 1B7Canada BOSK Bio ProductsQuebecCanada School of Technology Huzhou UniversityHuzhouChina Department of Chemistry Universite de MontrealMontrealQCCanada Centre de Recherche Indust

The study was conducted to investigate the effect of sludge retention on bacterial community composition of membrane bioreactor(MBR)treating synthetic hospital *** removal of four pharmaceuticals,namely carbamazepine,estradiol,venlafaxine,and ibuprofen in MBR,was studied at varying sludge retention time(SRT)duration of 100,45,and 15 days and hydraulic retention time(HRT)of 18 *** removal of ibuprofen and estradiol was constant at varying SRT;however,a negligible removal of carbamazepine and low removal of venlafaxine was observed(<20%).The study suggested that the SRT of 45 days in MBR could provide maximum treatment efficiency via decreasing membrane *** effect of sludge age and pharmaceutical presence on the bacterial community was investigated via high-throughput *** study reveals that the variation in SRT affects the dynamics of the bacterial community *** instance,the dominant bacterium Caldimonas of SRT 100 was disappeared at lower ***,the profile of the dominant genus of the SRTs varied greatly from each other.

关键词： Membrane bioreactor Pharmaceuticals Sludge retention time Bacterial community

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