Bioreactors for acidogenic fermentation of tannery sludge
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PROVIDER: PRJNA1178871 | ENA |
REPOSITORIES: ENA
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Project description:The production of polyhydroxyalkanoates (PHAs) has been herein investigated by using an organic acid mixture originated from a pilot-scale acidogenic fermentation (AF) of reground pasta (RP) byproduct. The pilot-scale AF process was conducted either under no pH control or with the pH maintained at a value of 5.90, with the two obtained fermented mixtures termed RP-fermented 1 and RP-fermented 2, respectively. The fermented mixtures were fed to a lab-scale sequencing batch reactor (SBR), operated at short hydraulic retention time (HRT, 0.5 days) and sludge retention time (SRT, 1 day) and at two values of the applied organic loading rate (OLR) of 2.12 gCODACIDS/Ld and 4.25 gCODACIDS/Ld. During all of the SBR operating conditions, a high selective microbial pressure was established, as confirmed by both the microbiology analysis and the detected values of the storage yield (which reached a maximum value of 0.68 ± 0.04 CODPHA/CODACIDS). A poly(hydroxybutyrate/hydroxyvalerate) copolymer and a poly(hydroxybutyrate/hydroxyvalerate/hydroxyhexanoate) terpolymer were produced with the RP-fermented 1 and RP-fermented 2 streams, respectively. When the OLR of 2.12 gCODACIDS/Ld was applied to the SBR, the stored copolymer and terpolymer presented very similar molecular weights of 339 and 389 kDa, respectively.
| S-EPMC11881138 | biostudies-literature
Project description:This study compares the effects of pre- and post-hydrothermal treatment of source- separated organics (SSO) on solubilization of particulate organics and acidogenic fermentation for volatile fatty acids (VFAs) production. The overall COD solubilization and solids removal efficiencies from both schemes were comparable. However, the pre-hydrolysis of SSO followed by acidogenic fermentation resulted in a relatively higher VFA yield of 433 mg/g VSS, which was 18% higher than that of a process scheme with a post-hydrolysis of dewatered solids from the fermentation process. Regarding the composition of VFA, the dominance of acetate and butyrate was comparable in both process schemes, while propionate concentration considerably increased in the process with pre-hydrolysis of SSO. The microbial community results showed that the relative abundance of Firmicutes increased substantially in the fermentation of pretreated SSO, indicating that there might be different metabolic pathways for production of VFAs in fermentation process operated with pre-treated SSO. The possible reason might be that the abundance of soluble organic matters due to pre-hydrolysis might stimulate the growth of more kinetically efficient fermentative bacteria as indicated by the increase in Firmicutes percentage.
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Project description:Biological sulfate reduction (BSR) represents a promising strategy for bioremediation of sulfate-rich waste streams, yet the impact of metabolic interactions on performance is largely unexplored. Here, genome-resolved metagenomics was used to characterize 17 microbial communities in reactors treating synthetic sulfate-contaminated solutions. Reactors were supplemented with lactate or acetate and a small amount of fermentable substrate. Of the 163 genomes representing all the abundant bacteria, 130 encode 321 NiFe and FeFe hydrogenases and all genomes of the 22 sulfate-reducing microorganisms (SRM) encode genes for H2 uptake. We observed lactate oxidation solely in the first packed bed reactor zone, with propionate and acetate oxidation in the middle and predominantly acetate oxidation in the effluent zone. The energetics of these reactions are very different, yet sulfate reduction kinetics were unaffected by the type of electron donor available. We hypothesize that the comparable rates, despite the typically slow growth of SRM on acetate, are a result of the consumption of H2 generated by fermentation. This is supported by the sustained performance of a predominantly acetate-supplemented stirred tank reactor dominated by diverse fermentative bacteria encoding FeFe hydrogenase genes and SRM capable of acetate and hydrogen consumption and CO2 assimilation. Thus, addition of fermentable substrates to stimulate syntrophic relationships may improve the performance of BSR reactors supplemented with inexpensive acetate.
| S-EPMC10867827 | biostudies-literature
Project description:BackgroundCo-fermentation is an attractive technology for improving volatile fatty acids (VFAs) production by treatment of solid organic wastes. However, it remains unclear how the composition of different organic matters in solid waste influences the VFAs distribution, microbial community structure, and metabolic pathway during acidogenic co-fermentation. In this study, different organic wastes were added into waste activated sludge (WAS) as co-fermentation substrates to explore the impact of organic matter composition on VFAs pattern and the microbiological mechanism .ResultsAcetate was the most dominant VFA produced in all fermentation groups, making up 41.3-57.6% of the total VFAs produced during acidogenic co-fermentation under alkaline condition. With the increased addition of potato peel waste, the concentrations of propionate and valerate decreased dramatically, while ethanol and butyrate concentrations increased. The addition of food waste caused gradual decreases of valerate and propionate, but ethanol increased and butyrate was relatively stable. Some inconsistency was observed between hydrolysis efficiency and acidification efficiency. Our results revealed that starch was mainly responsible for butyrate and ethanol formation, while lipids and protein favored the synthesis of valerate and propionate. Microbial community analysis by high-throughput sequencing showed that Firmicutes had the highest relative abundance at phylum level in all fermentation groups. With 75% potato peel waste or 75% food waste addition to WAS, Bacilli (72.2%) and Clostridia (56.2%) were the dominant respective classes. In fermentation using only potato peel waste, the Bacilli content was 64.1%, while the Clostridia content was 53.6% in the food-only waste fermentation.ConclusionsAcetate was always the dominant product in acidogenic co-fermentation, regardless of the substrate composition. The addition of carbon-rich substrates significantly enhanced butyrate and ethanol accumulation, while protein-rich substrate substantially benefited propionate and valerate generation. Potato peel waste substantially favored the enrichment of Bacilli, while food waste dramatically increased Clostridia content in the sludge.
| S-EPMC5446719 | biostudies-literature
Project description:Valuable routes for sewage sludge utilization: effect of temperature and hydraulic retention time in the acidogenic fermentation process
| PRJNA830363 | ENA