RT info:eu-repo/semantics/article
T1 A comparative study of the treatment of dark fermentation effluent by purple-phototrophic bacteria and microalgae with focus on substrate to biomass conversion
A1 Regueira Marcos, Lois
A1 García Depraect, Octavio
A1 Muñoz Torre, Raúl
K1 Bioremediation
K1 Bioenergy
K1 Dark fermentation
K1 Ponds
K1 Microalgae
K1 Purple phototrophic bacteria
K1 Waste valorization
K1 3308 Ingeniería y Tecnología del Medio Ambiente
AB The treatment of dark fermentation effluents from food waste was evaluated in two photobioreactor systems: apurple phototrophic bacteria (PPB) reactor and a microalgae-bacteria consortium (MBC) reactor. Experimentswere performed at hydraulic retention times (HRT) of 5 and 10 days (P1 and P2, respectively) to maximizebiomass yield for wastewater valorization.At the microbiological level, the PPB reactor exhibited a decrease in PPB abundance with longer HRTs, fa-voring other genera. In contrast, the MBC reactor showed a marked reduction in microalgae under both con-ditions, with PPBs predominating in P1 and a diverse microbial community in P2. The increase in HRT from 5 to10 days improved pollutant removal but did not enhance biomass concentration, which stabilized at 0.61 ± 0.08g/L (PPB) and 1.37 ± 0.16 g/L (MBC) at 5-day HRT.The highest biomass yield (1.03 ± 0.07 gCbiomass/gTOCremoved) was achieved in the MBC reactor at 5-day HRT,where preferential consumption of lactate and butyrate occurred, leaving acetate less assimilated. Despite thelower overall pollutant removal at 5-day HRT (TOC: 56.0 ± 3.5 %, TN: 60.3 ± 9.0 %, PO₄3 : 20.4 ± 7.4 %), thiscondition allowed for higher conversions of dissolved carbon into biomass rather than full mineralization. Thistrade-off is advantageous when targeting biomass valorization over complete pollutant removal, especiallyconsidering the commercial value of the residual organic acids. These results highlight the potential of short HRToperations in MBC systems for industrial application, enabling efficient resource recovery from fermentationeffluents through selective assimilation, while maximizing biomass productivity and minimizing loss of valuableorganics.
PB Elsevier
SN 2211-9264
YR 2025
FD 2025
LK https://uvadoc.uva.es/handle/10324/79842
UL https://uvadoc.uva.es/handle/10324/79842
LA eng
NO Algal Research, 2025, vol. 91, p. 104306
NO Producción Científica
DS UVaDOC
RD 19-nov-2025