Hydrogen and organic acid production from dark fermentation of cheese whey without buffers under mesophilic condition

Ribeiro, Jaqueline Cardoso; Mota, Vera Tainá; Oliveira, Valéria Maia de; Zaiat, Marcelo

doi:10.1016/j.jenvman.2021.114253

Cited by 27 publications

(18 citation statements)

References 45 publications

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“…Results regarding bioH 2 production in this study were extremely consistent with those observed in previous studies 22,30 . Ribeiro et al 30 .…”

Section: Resultssupporting

confidence: 93%

“…Results regarding bioH 2 production in this study were extremely consistent with those observed in previous studies 22,30 . Ribeiro et al 30 . evaluated bioH 2 production from cheese whey without buffers and using the same biomass adaptation strategy with sucrose that was used in this study.…”

Section: Resultssupporting

confidence: 89%

“…A sharp reduction of microbial diversity, compared to the inoculum, in reactors fed with sucrose‐based effluent and accompanied by extremely low pH values (<3.0) were also observed in previous studies 22,30 . Moreover, hydrogen production in these conditions was associated with the presence of bacteria related to Ethanoligenens and Clostridium acidisoli (this species belongs to Clostridium sensu stricto 12), both which were also found in this study (Fig.…”

Section: Resultssupporting

confidence: 88%

“…obtained a fraction of ethanol corresponding to 27% of the total soluble COD analysed in a pH below 3.0, which was concomitant with a relevant H 2 production. Better bioH 2 results were also observed, along with higher ethanol concentrations, in two different stages of a previous study 30 . This condition was observed in this study when sucrose was the only feeding substrate (Fig.…”

Section: Resultssupporting

confidence: 87%

“…Further details regarding the procedure used to conduct molecular analyses are described in Ribeiro et al 30 . and in Appendix 1.…”

Section: Methodsmentioning

confidence: 99%

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Hydrogen and organic acid production from dark fermentation of sugarcane vinasse without buffers in mesophilic and thermophilic conditions

Ribeiro

Mota

Oliveira

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND Sugarcane vinasse has a low pH and several studies report that alkalinity supplementation is essential to the stability of its dark fermentation (DF). In the context of biorefineries, the reduction, or even elimination, of alkalinizing agents could be extremely environmentally and economically advantageous. The main objective of this study was to evaluate the valorisation of vinasse DF through bioH2 and value‐added metabolite production without buffers in two similar Upflow Anaerobic Sludge Blanket (UASB) under mesophilic (U30) and thermophilic (U55) conditions. RESULTS Average organic acid yields of 376 ± 52 and 248 ± 122 mg‐CODOA.g−1CODtin, and productivities of 17 396 ± 5220 and 14 024 ± 1642 mg‐CODOA.L−1 day−1 were obtained for U30 and U55 reactors, respectively, with only vinasse as substrate (CODOA stands for organic acids chemical oxygen demand (COD) and CODin influent COD). BioH2 production was feasible with sucrose as substrate and pH below 3.0, but it ceased with substrate replacement by vinasse along with a natural pH increase. A change in microbial community was also observed: Ethanoligenens, Clostridium sensu stricto 12, and Liquorilactobacillus (using sucrose and with a pH <3.0) were replaced by Prevotella, Megasphaera, Pectinatus, Clostridium sensu stricto 11, and Lactobacillus using vinasse (with a pH > 4.0). CONCLUSION Results showed that DF of sugarcane vinasse without any buffering addition might be a promising approach for the valorization of real wastewater through the production of organic acids. Nevertheless, bioH2 production was not favored and further strategies would be needed to maintain hydrogen‐producing bacteria when sucrose is replaced by real effluent with a natural pH increase. © 2021 Society of Chemical Industry (SCI).

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“…Results regarding bioH 2 production in this study were extremely consistent with those observed in previous studies 22,30 . Ribeiro et al 30 .…”

Section: Resultssupporting

confidence: 93%

Section: Resultssupporting

confidence: 89%

Section: Resultssupporting

confidence: 88%

Section: Resultssupporting

confidence: 87%

“…Further details regarding the procedure used to conduct molecular analyses are described in Ribeiro et al 30 . and in Appendix 1.…”

Section: Methodsmentioning