Salinity induced acidogenic fermentation of food waste regulates biohydrogen production and volatile fatty acids profile

Sarkar, Omprakash; Katari, John Kiran; Chatterjee, Sulogna; Mohan, S. Venkata

doi:10.1016/j.fuel.2020.117794

Cited by 43 publications

(11 citation statements)

References 37 publications

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“…Regarding the fermentation of only FW, with a salinity of 10 and 30 g L −1 , and a pH of 6, the yield of acidification attained in the experiments of He et al [36] was around 100% (estimated).The sum of the VFA produced in that work rounded to 26 g L −1 which is close to the ones obtained in BSR-7 (22.8 g L −1 in COD) and PBRS-7 (20.3 g L −1 in COD); nevertheless, caproate and valerate were not produced, only shorter VFA were (Table 3), while in this work these longer chain acids were produced (Figure 3, Table 3). Sarkar et al [37] obtained better results than the ones from experiment II, i.e., under a pH of 6 and 10-20 g L −1 of salinity, the acidification yields of FW were around 53-61%; nevertheless, the final VFA concentration (approximately 6 g L −1 ) was lower than the ones obtained in this study. This may be explained by the fact that the organic load tested by Sarkar et al [37] (15 g L −1 in COD) was much lower than the one tested in this work (50 g L −1 in COD).…”

Section: Discussioncontrasting

confidence: 82%

“…Sarkar et al [37] obtained better results than the ones from experiment II, i.e., under a pH of 6 and 10-20 g L −1 of salinity, the acidification yields of FW were around 53-61%; nevertheless, the final VFA concentration (approximately 6 g L −1 ) was lower than the ones obtained in this study. This may be explained by the fact that the organic load tested by Sarkar et al [37] (15 g L −1 in COD) was much lower than the one tested in this work (50 g L −1 in COD).…”

Section: Discussioncontrasting

confidence: 82%

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Volatile Fatty Acids (VFA) Production from Wastewaters with High Salinity—Influence of pH, Salinity and Reactor Configuration

et al. 2021

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The hydrocarbon-based economy is moving at a large pace to a decarbonized sustainable bioeconomy based on biorefining all types of secondary carbohydrate-based raw materials. In this work, 50 g L−1 in COD of a mixture of food waste, brine and wastewater derived from a biodiesel production facility were used to produce organic acids, important building-blocks for a biobased industry. High salinity (12–18 g L−1), different reactors configuration operated in batch mode, and different initial pH were tested. In experiment I, a batch stirred reactor (BSR) at atmospheric pressure and a granular sludge bed column (GSBC) were tested with an initial pH of 5. In the end of the experiment, the acidification yield (ηa) was similar in both reactors (22–24%, w/w); nevertheless, lactic acid was in lower concentrations in BSR (6.3 g L−1 in COD), when compared to GSBC (8.0 g L−1 in COD), and valeric was the dominant acid, reaching 17.3% (w/w) in the BSR. In experiment II, the BSR and a pressurized batch stirred reactor (PBSR, operated at 6 bar) were tested with initial pH 7. The ηa and the VFA concentration were higher in the BSR (46%, 22.8 g L−1 in COD) than in the PBSR (41%, 20.3 g/L in COD), and longer chain acids were more predominant in BSR (24.4% butyric, 6.7% valeric, and 6.2% caproic acids) than in PBSR (23.2%, 6.2%, and 4.2%, respectively). The results show that initial pH of 7 allows achieving higher ηa, and the BSR presents the most suitable reactor among tested configurations to produce VFA from wastes/wastewaters with high salinity.

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Section: Discussioncontrasting

confidence: 82%

Section: Discussioncontrasting

confidence: 82%

Volatile Fatty Acids (VFA) Production from Wastewaters with High Salinity—Influence of pH, Salinity and Reactor Configuration

et al. 2021

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“…Taheri et al [177] found that increasing NaCl concentration from 0.5 g/L to 30 g/L had a negative effect on hydrogen yield, decreasing it from 1.1 mol H 2 /mol glucose to 0.3 mol H 2 /mol glucose. However, Sarkar et al [178] reported that a NaCl concentration as high as 40 g/L resulted in maximum hydrogen yields from a food waste reactor. This study also found that a 40 g/L NaCl addition improved total VFA yields by 1.35 times, producing 6.58 g/L compared with 4.84 g/L from the control experiment.…”

Section: Additivesmentioning

confidence: 99%

Intensification of Acidogenic Fermentation for the Production of Biohydrogen and Volatile Fatty Acids—A Perspective

et al. 2022

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Utilising ‘wastes’ as ‘resources’ is key to a circular economy. While there are multiple routes to waste valorisation, anaerobic digestion (AD)—a biochemical means to breakdown organic wastes in the absence of oxygen—is favoured due to its capacity to handle a variety of feedstocks. Traditional AD focuses on the production of biogas and fertiliser as products; however, such low-value products combined with longer residence times and slow kinetics have paved the way to explore alternative product platforms. The intermediate steps in conventional AD—acidogenesis and acetogenesis—have the capability to produce biohydrogen and volatile fatty acids (VFA) which are gaining increased attention due to the higher energy density (than biogas) and higher market value, respectively. This review hence focusses specifically on the production of biohydrogen and VFAs from organic wastes. With the revived interest in these products, a critical analysis of recent literature is needed to establish the current status. Therefore, intensification strategies in this area involving three main streams: substrate pre-treatment, digestion parameters and product recovery are discussed in detail based on literature reported in the last decade. The techno-economic aspects and future pointers are clearly highlighted to drive research forward in relevant areas.

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“…They observed biohydrogen yields of up to 26% with volatile fatty acids recovery of 4595 mg/L from food waste by electro-fermentation [ 70 ]. Increased biohydrogen and volatile fatty acids yields were observed by calculating salinity level up to 40 g/L of NaCl [ 71 ]. 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 ].…”

Section: Food Waste Biorefinery Productsmentioning

confidence: 99%

“…Increased biohydrogen and volatile fatty acids yields were observed by calculating salinity level up to 40 g/L of NaCl [ 71 ]. 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 ]. Enhancement of CH 4 and biohydrogen production was also absorbed from food waste collected from restaurants.…”

Section: Food Waste Biorefinery Productsmentioning

confidence: 99%

Food Waste Biorefinery: Pathway towards Circular Bioeconomy

Tsegaye

Jaiswal

2021

Foods

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Food waste biorefineries for the production of biofuels, platform chemicals and other bio-based materials can significantly reduce a huge environmental burden and provide sustainable resources for the production of chemicals and materials. This will significantly contribute to the transition of the linear based economy to a more circular economy. A variety of chemicals, biofuels and materials can be produced from food waste by the integrated biorefinery approach. This enhances the bioeconomy and helps toward the design of more green, ecofriendly, and sustainable methods of material productions that contribute to sustainable development goals. The waste biorefinery is a tool to achieve a value-added product that can provide a better utilization of materials and resources while minimizing and/or eliminating environmental impacts. Recently, food waste biorefineries have gained momentum for the production of biofuels, chemicals, and bio-based materials due to the shifting of regulations and policies towards sustainable development. This review attempts to explore the state of the art of food waste biorefinery and the products associated with it.

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Salinity induced acidogenic fermentation of food waste regulates biohydrogen production and volatile fatty acids profile

Cited by 43 publications

References 37 publications

Volatile Fatty Acids (VFA) Production from Wastewaters with High Salinity—Influence of pH, Salinity and Reactor Configuration

Volatile Fatty Acids (VFA) Production from Wastewaters with High Salinity—Influence of pH, Salinity and Reactor Configuration

Intensification of Acidogenic Fermentation for the Production of Biohydrogen and Volatile Fatty Acids—A Perspective

Food Waste Biorefinery: Pathway towards Circular Bioeconomy

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