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dc.contributor.authorGutiérrez Martínez, Raquel
dc.contributor.authorFerrer Martí, Ivet
dc.contributor.authorGonzález-Molina, Andres
dc.contributor.authorSalvado, Humbert
dc.contributor.authorGarcía Serrano, Joan
dc.contributor.authorUggetti, Enrica
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental
dc.identifier.citationGutierrez, R., Ferrer, I., González-Molina, A., Salvado, H., Garcia, J., Uggetti, E. Microalgae recycling improves biomass recovery from wastewater treatment high rate algal ponds. "Water research (Oxford)", Desembre 2016, vol. 106, p. 539-549.
dc.description.abstractMicroalgal biomass harvesting by inducing spontaneous flocculation (bioflocculation) sets an attractive approach, since neither chemicals nor energy are needed. Indeed, bioflocculation may be promoted by recycling part of the harvested microalgal biomass to the photobioreactor in order to increase the predominance of rapidly settling microalgae species. The aim of the present study was to improve the recovery of microalgal biomass produced in wastewater treatment high rate algal ponds (HRAPs) by recycling part of the harvested microalgal biomass. The recirculation of 2% and 10% (dry weight) of the HRAPs microalgal biomass was tested over one year in an experimental HRAP treating real urban wastewater. Results indicated that biomass recycling had a positive effect on the harvesting efficiency, obtaining higher biomass recovery in the HRAP with recycling (R-HRAP) (92–94%) than in the control HRAP without recycling (C-HRAP) (75–89%). Microalgal biomass production was similar in both systems, ranging between 3.3 and 25.8 g TSS/m2d, depending on the weather conditions. Concerning the microalgae species, Chlorella sp. was dominant overall the experimental period in both HRAPs (abundance >60%). However, when the recycling rate was increased to 10%, Chlorella sp. dominance decreased from 97.6 to 88.1%; while increasing the abundance of rapidly settling species such as Stigeoclonium sp. (16.8%, only present in the HRAP with biomass recycling) and diatoms (from 0.7 to 7.3%). Concerning the secondary treatment of the HRAPs, high removals of COD (80%) and N-NH4+ (97%) were found in both HRAPs. Moreover, by increasing the biomass recovery in the R-HRAP the effluent total suspended solids (TSS) concentration was decreased to less than 35 mg/L, meeting effluent quality requirements for discharge. This study shows that microalgal biomass recycling (10% dry weight) increases biomass recovery up to 94% by selecting the most rapidly settling microalgae species without compromising the biomass production and improving the wastewater treatment in terms of TSS removal.
dc.format.extent11 p.
dc.subjectÀrees temàtiques de la UPC::Desenvolupament humà i sostenible::Enginyeria ambiental::Tractament de l'aigua
dc.subject.lcshWastewater treatment and reuse
dc.subject.otherBiomass recovery
dc.subject.otherMicroalgae species selection
dc.subject.otherMicroalgal biomass production
dc.titleMicroalgae recycling improves biomass recovery from wastewater treatment high rate algal ponds
dc.subject.lemacMicroalgues -- Biotecnologia
dc.subject.lemacAigües residuals -- Depuració -- Tractament biològic
dc.contributor.groupUniversitat Politècnica de Catalunya. GEMMA - Grup d'Enginyeria i Microbiologia del Medi Ambient
dc.description.peerreviewedPeer Reviewed
dc.rights.accessOpen Access
dc.description.versionPostprint (author's final draft)
upcommons.citation.authorGutierrez, R.; Ferrer, I.; González-Molina, A.; Salvado, H.; Garcia, J.; Uggetti, E.
upcommons.citation.publicationNameWater research (Oxford)

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