Granulation and microbial community dynamics in the chitosan-supplemented anaerobic treatment of wastewater polluted with organic solvents
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Granulation and microbial community dynamics in the chitosan-supplemented anaerobic treatment of wastewater polluted with organic solvents

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Granulation and microbial community dynamics in the chitosan-supplemented anaerobic treatment of wastewater polluted with organic solvents

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dc.contributor.author Torres, K.
dc.contributor.author Alvarez Hornos, Francisco Javier
dc.contributor.author San-Valero, Pau
dc.contributor.author Gabaldón García, Carmen
dc.contributor.author Marzal Doménech, Paula
dc.date.accessioned 2019-02-13T18:09:02Z
dc.date.available 2019-02-13T18:09:02Z
dc.date.issued 2018
dc.identifier.uri http://hdl.handle.net/10550/68959
dc.description.abstract The effect of chitosan on the development of granular sludge in upflow anaerobic sludge blanket reactors (UASB) when treating wastewater polluted with the organic solvents ethanol, ethyl acetate, and 1-ethoxy-2-propanol was evaluated. Three UASB reactors were operated for 219 days at ambient temperature with an organic loading rate (OLR) of between 0.3 kg COD m−3 d−1 and 20 kg COD m−3 d−1. One reactor was operated without the addition of chitosan, while the other two were operated with the addition of chitosan doses of 2.4 mg gVSS−1 two times. The three reactors were all able to treat the OLR tested with COD removal efficiencies greater than 90%. However, the time required to reach stable operation was considerably reduced in the chitosan-assisted reactors. The development of granules in the reactors with chitosan was accelerated and granules larger than 2000 μm were only observed in these reactors. In addition, these granules exhibited better physicochemical characteristics: the mean particle diameter (540 and 613 μm) was approximately two times greater than in the control reactor (300 μm), and the settling velocities exceeded 35 m h−1. The extracellular polymeric substances (EPS) in the reactors with the chitosan was found to be higher than in the control reactor. The protein-EPS content has been correlated with the granule size. The analyses of the microbial communities, performed through denaturing gradient gel electrophoresis and high-throughput sequencing, revealed that the syntrophic microorganisms belonging to genus Geobacter and the hydrogenotrophic methanogen Methanocorpusculum labreanum were predominant in the granules. Other methanogens like Methanosaeta species were found earlier in the chitosan-assisted reactors than in the control reactor.
dc.language.iso eng
dc.relation.ispartof Water Research, 2018, vol. 130, p. 376-387
dc.rights.uri info:eu-repo/semantics/openAccess
dc.source Torres, K. Alvarez Hornos, Francisco Javier San-Valero, Pau Gabaldón García, Carmen Marzal Doménech, Paula 2018 Granulation and microbial community dynamics in the chitosan-supplemented anaerobic treatment of wastewater polluted with organic solvents Water Research 130 376 387
dc.subject Aigua Contaminació
dc.subject Aigua Microbiologia
dc.title Granulation and microbial community dynamics in the chitosan-supplemented anaerobic treatment of wastewater polluted with organic solvents
dc.type info:eu-repo/semantics/article
dc.date.updated 2019-02-13T18:09:02Z
dc.identifier.doi https://doi.org/10.1016/j.watres.2017.12.009
dc.identifier.idgrec 121538

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