Salinity induced acidogenic fermentation of food waste regulates biohydrogen production and volatile fatty acids profile
Abstract
Influence of salinity on acidogenic fermentation (AF) specific to the production of biohydrogen (H 2 ), volatile fatty acids (VFA) and biohythane from food waste (FW) was studied by varying salinity concentration [1 g L −1 (S 1 ), 5 g L −1 (S 5 ), 10 g L −1 (S 10 ), 20 g L −1 (S 20 ), 30 g L −1 (S 30 ), 40 g L −1 (S 40 ) and 50 g L −1 (S 50 )]. Maximum H 2 production rate (HPR) of 0.044 L h −1 and cumulative H 2 production (CHP) of 1.05 L was achieved at 40 g NaCl L −1 salinity. Hypersaline conditions (>10 g NaCl L −1 ) suppressed methanogenic activity and resulted in zero methane evolution. Benefits of salinity were also seen on VFA production with accumulation of more butyric acid (C4: 3.04 g L −1 ) and acetic acid (C2:1.17 g L −1 ) along with traces of valeric acid (C5:11 mg L −1 ) with good acidification potential (AP) of 65.38% at 40 g NaCl L −1 . Dehydrogenase (DH) enzyme activity was well correlated with H 2 production, wherein S 40 showed the highest DH activity of 6.77 μg mL −1 . Elevated NaCl concentration (50 g L −1 ) not only suppressed methanogenic activity but also reduced the acidogenic activity. Increased salinity conditions (30–40 g L −1 ) depicted good in situ buffering capacity during acidogenic fermentation and also aided in higher H 2 /VFA production. Study illustrated the significance of salinity as a regulator parameter in aiding the bio-conversion of waste to bioenergy and platform chemicals.
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Addition of NaCl favored the production of butyric acid and inhibited methanogenesis while favoring acidogenesis, contributing to higher biohydrogen production.
“The addition of NaCl favored the production of butyric acid and inhibited the methanogenesis process while favoring the acidogenesis process that contributed for higher biohydrogen production [71].”
From Food Waste Biorefinery: Pathway towards Circular Bioeconomy (2021) · cites this paper as [71]
Increased biohydrogen and volatile fatty acids yields were observed by calculating salinity level up to 40 g/L of NaCl.
“Increased biohydrogen and volatile fatty acids yields were observed by calculating salinity level up to 40 g/L of NaCl [71].”
From Food Waste Biorefinery: Pathway towards Circular Bioeconomy (2021) · cites this paper as [71]
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Food Waste Biorefinery: Pathway towards Circular Bioeconomy
Tsegaye, B., Jaiswal, S., & Jaiswal, A. K. (2021) · Foods · doi:10.3390/foods10061174 · Cited by 191 · see citing works
- Authors
- Sarkar, O., Kiran Katari, J., Chatterjee, S., & Venkata Mohan, S.
- Affiliations
- Indian Institute of Chemical Technology (IN)
- Venue
- Fuel
- Publisher
- Elsevier BV
- Published
- 2020-09
- Volume
- 276
- Pages
- 117794
- ISSN
- 0016-2361 (ISSN-L)
- OpenAlex
- W3029318014
- Cited by
- 53
- References
- 42
- Citations by year
- 2026: 7 · 2025: 6 · 2024: 13 · 2023: 9 · 2022: 12 · 2021: 4 · 2020: 2
- FWCI
- 3.58
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Fuel (publishedVersion)
- Funders
- Department of Biotechnology, Ministry of Science and Technology, India
- Topics
- Physical Sciences › Engineering › Building and Construction › Anaerobic Digestion and Biogas Production
- Physical Sciences › Engineering › Biomedical Engineering › Biofuel production and bioconversion
- Physical Sciences › Environmental Science › Waste Management and Disposal › Landfill Environmental Impact Studies
- Keywords
- salinity, acidogenesis, biohydrogen production, food waste, volatile fatty acids, butyrate, acetic acid, dehydrogenase activity, biohythane, buffering capacity, anaerobic digestion, waste-to-energy
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