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Sci Total Environ

Title:		Micropollutants removal in tertiary moving bed biofilm reactors (MBBRs): Contribution of the biofilm and suspended biomass
Author(s):		Abtahi SM; Petermann M; Juppeau Flambard A; Beaufort S; Terrisse F; Trotouin T; Joannis Cassan C; Albasi C;
Address:		"Universite de Toulouse, INPT, UPS, Laboratoire de Genie Chimique, 4 Allee Emile Monso, F31432 Toulouse, France. Electronic address: mehran.abtahi@ensiacet.fr. Universite de Toulouse, INPT, UPS, Laboratoire de Genie Chimique, 4 Allee Emile Monso, F31432 Toulouse, France. Biovitis S.A., Le Bourg, 15400 Saint-Etienne-de-Chomeil, France. Veolia, Centre regional Toulouse Pyrenees, 22 avenue Marcel Dassault, 31506 Toulouse, France. Universite de Toulouse, INPT, UPS, Laboratoire de Genie Chimique, 4 Allee Emile Monso, F31432 Toulouse, France. Electronic address: claire.albasi@ensiacet.fr"
Journal Title:		Sci Total Environ
Year:		2018
Volume:		20180704
Issue:
Page Number:		1464 - 1480
DOI:		10.1016/j.scitotenv.2018.06.303
ISSN/ISBN:		1879-1026 (Electronic) 0048-9697 (Linking)
Abstract:		"The performance of tertiary moving bed biofilm reactors (MBBRs) was evaluated in terms of micropollutants (MPs) removal from secondary-treated municipal wastewater. After stepwise establishment of a mature biofilm, monitored by scanning electron and confocal microscopies, abiotic and biotic removals of MPs were deeply studied. Since no MPs reduction was observed by the both photodegradation and volatilization, abiotic removal of MPs was ascribed to the sorption onto the biomass. Target MPs i.e. Naproxen, Diclofenac, 17beta-Estradiol and 4n-Nonylphenol, arranged in the ascending order of hydrophobicity, abiotically declined up to 2.8%, 4%, 9.5% and 15%, respectively. MPs sorption onto the suspended biomass was found around two times more than the biofilm, in line with MPs' higher sorption kinetic constants (k(sor)) found for the suspended biomass. When comparing abiotic and biotic aspects, we found that biotic removal outperformed its counterpart for all compounds as Diclofenac, Naproxen, 17beta-Estradiol and 4n-Nonylphenol were biodegraded by 72.8, 80.6, 84.7 and 84.4%, respectively. The effect of the changes in organic loading rates (OLRs) was investigated on the pseudo-first order degradation constants (k(biol)), revealing the dominant biodegradation mechanism of co-metabolism for the removal of Diclofenac, Naproxen, and 4n-Nonylphenol, while 17beta-Estradiol obeyed the biodegradation mechanism of competitive inhibition. Biotic removals and k(biol) values of all MPs were also seen higher in the biofilm as compared to the suspended biomass. To draw a conclusion, a quite high removal of recalcitrant MPs is achievable in tertiary MBBRs, making them a promising technology that supports both pathways of co-metabolism and competitive inhibition, next to the abiotic attenuation of MPs"
Keywords:		"Biodegradation, Environmental Biofilms Biomass Bioreactors/microbiology Waste Disposal, Fluid/*methods Wastewater/chemistry Water Pollutants/*analysis Biodegradation Co-metabolism Competitive inhibition Mbbr Micropollutants Sorption;"
Notes:		"MedlineAbtahi, S Mehran Petermann, Maike Juppeau Flambard, Agathe Beaufort, Sandra Terrisse, Fanny Trotouin, Thierry Joannis Cassan, Claire Albasi, Claire eng Netherlands 2018/09/08 Sci Total Environ. 2018 Dec 1; 643:1464-1480. doi: 10.1016/j.scitotenv.2018.06.303. Epub 2018 Jul 4"