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Production of microalgal external organic matter in a Chlorella-dominated culture: influence of temperature and stress factors

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Production of microalgal external organic matter in a Chlorella-dominated culture: influence of temperature and stress factors

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dc.contributor.author	González-Camejo, J.
dc.contributor.author	Pachés, María
dc.contributor.author	Marín, A.
dc.contributor.author	Jiménez Benítez, Antonio Luis
dc.contributor.author	Seco Torrecillas, Aurora
dc.contributor.author	Barat, Ramón
dc.date.accessioned	2021-04-21T16:37:23Z
dc.date.available	2021-05-13T04:45:06Z
dc.date.issued	2020
dc.identifier.citation	González-Camejo, J. Pachés, María Marín, A. Jiménez Benítez, Antonio Luis Seco Torrecillas, Aurora Barat, Ramón 2020 Production of microalgal external organic matter in a Chlorella-dominated culture: influence of temperature and stress factors Environmental Science-Water Research & Technology 6 1828 1841
dc.identifier.uri	https://hdl.handle.net/10550/78874
dc.description.abstract	Although microalgae are recognised to release external organic matter (EOM), little is known about this phenomenon in microalgae cultivation systems, especially on a large scale. A study on the effect of microalgae-stressing factors such as temperature, nutrient limitation and ammonium oxidising bacteria (AOB) competition in EOM production by microalgae was carried out. The results showed non-statistically significant differences in EOM production at constant temperatures of 25, 30 and 35 °C. However, when the temperature was raised from 25 to 35 °C for 4 h a day, polysaccharide production increased significantly, indicating microalgae stress. Nutrient limitation also seemed to increase EOM production. No significant differences were found in EOM production under lab conditions when the microalgae competed with AOB for ammonium uptake. However, when the EOM concentration was monitored during continuous outdoor operation of a membrane photobioreactor (MPBR) plant, nitrifying bacteria activity was likely to be responsible for the increase in EOM concentration in the culture. Other factors such as high temperatures, ammonium-depletion and low light intensities could also have induced cell deterioration and thus have influenced EOM production in the outdoor MPBR plant. Membrane fouling seemed to depend on the biomass concentration of the culture. However, under the operating conditions tested, the behaviour of fouling rate with respect to the EOM concentration was different depending on the initial membrane state.
dc.language.iso	eng
dc.relation.ispartof	Environmental Science-Water Research & Technology, 2020, vol. 6, p. 1828-1841
dc.subject	Aigua Microbiologia
dc.subject	Aigües residuals Depuració Tractament biològic
dc.title	Production of microalgal external organic matter in a Chlorella-dominated culture: influence of temperature and stress factors
dc.type	journal article	es_ES
dc.date.updated	2021-04-21T16:37:24Z
dc.identifier.doi	10.1039/D0EW00176G
dc.identifier.idgrec	140719
dc.rights.accessRights	open access	es_ES