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Continuous 3-year outdoor operation of a flat-panel membrane photobioreactor to treat effluent from an anaerobic membrane bioreactor

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Continuous 3-year outdoor operation of a flat-panel membrane photobioreactor to treat effluent from an anaerobic membrane bioreactor

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dc.contributor.author	González-Camejo, J.
dc.contributor.author	Barat, Ramón
dc.contributor.author	Aguado García, Daniel
dc.contributor.author	Ferrer Polo, José
dc.date.accessioned	2020-04-09T10:03:07Z
dc.date.available	2020-04-09T10:03:07Z
dc.date.issued	2019
dc.identifier.citation	González-Camejo, J. Barat, Ramón Aguado García, Daniel Ferrer Polo, José 2019 Continuous 3-year outdoor operation of a flat-panel membrane photobioreactor to treat effluent from an anaerobic membrane bioreactor Water Research 169 115238
dc.identifier.uri	https://hdl.handle.net/10550/73863
dc.description.abstract	A membrane photobioreactor (MPBR) plant was operated continuously for 3 years to evaluate the separate effects of different factors, including: biomass and hydraulic retention times (BRT, HRT), light path (Lp), nitrification rate (NOxR) and nutrient loading rates (NLR, PLR). The overall effect of all these parameters, which influence MPBR performance had not previously been assessed. The multivariate projection approach chosen for this study provided a good description of the collected data and facilitated their visualization and interpretation. Forty variables used to control and assess MPBR performance were evaluated during three years of continuous outdoor operation by means of principal component analysis (PCA) and partial least squares (PLS) analysis. The PCA identified the photobioreactor light path as the factor with the largest influence on data variability. Other important factors were: air flow rate (Fair), nitrogen and phosphorus recovery rates (NRR, PRR), biomass productivity (BP),optical density at 680 nm (OD680), ammonium and phosphorus effluent concentration (NH4, P), HRT, BRT, and nitrogen and phosphorus loading rates (NLR and PLR). The MPBR performance could be adequately estimated by a PLS model based on all the recorded variables, but this estimation worsened appreciably when only the controllable variables (Lp, Fair, HRT and BRT) were used as predictors, which underlines the importance of the non-controlled variables on MPBR performance. The microalgae cultivation process could thus only be partially controlled by the design and operating variables. As effluent nitrate concentration was shown to be the key factor in the nitrification rate, it can be used as an indirect measurement of nitrifying bacteria activity. A high nitrification rate was found to be inadvisable, since it showed an inverse correlation with NRR. In this respect, temperature appeared to be the main ambient/controlling factor in nitrifying bacteria activity.
dc.language.iso	eng
dc.relation.ispartof	Water Research, 2019, vol. 169, p. 115238
dc.subject	Enginyeria ambiental
dc.subject	Microorganismes
dc.subject	Bacteris nitrificants
dc.title	Continuous 3-year outdoor operation of a flat-panel membrane photobioreactor to treat effluent from an anaerobic membrane bioreactor
dc.type	journal article	es_ES
dc.date.updated	2020-04-09T10:03:07Z
dc.identifier.doi	10.1016/j.watres.2019.115238
dc.identifier.idgrec	137679
dc.rights.accessRights	open access	es_ES