RT Journal Article
T1 Insights on the production of volatile fatty acids from saline wastewater
A1 Iglesias Riobó, Juan
A1 Balboa Méndez, Sabela
A1 Bevilacqua, Riccardo
A1 Mauricio Iglesias, Miguel
A1 Carballa Arcos, Marta
K1 Anaerobic fermentation
K1 Carboxylate platform
K1 Osmoregulation mechanisms
K1 Compatible-solutes
K1 Salt-in
AB This work investigates how several marine salt levels typical of canning industry wastewaters (0, 10, 15, 20, and 35 g salt/L), mainly composed of proteins and sugars, impact the production of volatile fatty acids (VFAs), their selectivity and the acidogenic microbiome. Mixed-culture fermenters were operated in continuous (25 °C, pH =7; HRT 1.5 d) and batch (25 °C, pH = 7, substrate-to-inoculum ratio 20 g COD/g VSS) regime. Low salinity levels (0–10 g/L) led to high VFA yields (74 %, COD basis), dropping to 46 % at higher salt concentrations. Acetic acid was always the main product (> 67 % molar basis), and butyric and valeric acid concentrations were negatively affected by high salinities (20–35 g/L). Salinity changes were also reflected in the microbial population: Clostridia was the dominant class in the whole salinity range although Actinobacteria increased its relative abundance as salinity increased. The experimental results were consistent with salt-in osmoregulation at low and medium salinities (0–15 g/L) while the compatible solutes strategy appears as more likely at high salinities (20–35 g salt/L). Given the needs for compatible solute strategy, these results enable the selection of co-substrates complementing wastewaters at the high salinity range to enhance the VFA production.
PB Elsevier
YR 2024
FD 2024
LK http://hdl.handle.net/10347/34342
UL http://hdl.handle.net/10347/34342
LA eng
NO Journal of Water Process Engineering Volume 64, July 2024, 105689
NO This research is part of CONSERVAL project, co-financed by the European Regional Development Funds through Interreg V-A Spain-Portugal Program (POCTEP) 2014-2020. The authors belong to a Galician Competitive Research Group (ED431C-2021/37).
DS Minerva
RD 3 may 2026