Volatile fatty acids as an added value from biowaste

Boer, Emilia den; Łukaszewska, Agnieszka; Kluczkiewicz, Władysław; Lewandowska, Daria; King, Kevin R.; Reijonen, Tero; Kuhmonen, Tero; Suhonen, Anssi; Jääskeläinen, Ari; Heitto, Anneli; Laatikainen, Reino; Hakalehto, Elias

doi:10.1016/j.wasman.2016.08.006

Cited by 43 publications

(8 citation statements)

References 25 publications

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“…As indicated above, this behavior could be explained by the co-fermentation effect [34]. These results are in accordance with previous works described in the literature, which reported positive effects of co-fermentation processes due to synergistic effects on acidogenic fermentation [33,35]. Once the acidogenic fermentation of the synthetic winery wastewater was complete, a total quantity of 3.26 L (STP) of hydrogen, 55% H 2 and 45% CO 2 , was obtained from the 2 L reactor.…”

Section: Winery Wastewater Fermentationsupporting

confidence: 92%

Bio-Energy Generation from Synthetic Winery Wastewaters

et al. 2020

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In Spain, the winery industry exerts a great influence on the national economy. Proportional to the scale of production, a significant volume of waste is generated, estimated at 2 million tons per year. In this work, a laboratory-scale reactor was used to study the feasibility of the energetic valorization of winery effluents into hydrogen by means of dark fermentation and its subsequent conversion into electrical energy using fuel cells. First, winery wastewater was characterized, identifying and determining the concentration of the main organic substrates contained within it. To achieve this, a synthetic winery effluent was prepared according to the composition of the winery wastewater studied. This effluent was fermented anaerobically at 26 °C and pH = 5.0 to produce hydrogen. The acidogenic fermentation generated a gas effluent composed of CO2 and H2, with the percentage of hydrogen being about 55% and the hydrogen yield being about 1.5 L of hydrogen at standard conditions per liter of wastewater fermented. A gas effluent with the same composition was fed into a fuel cell and the electrical current generated was monitored, obtaining a power generation of 1 W·h L−1 of winery wastewater. These results indicate that it is feasible to transform winery wastewater into electricity by means of acidogenic fermentation and the subsequent oxidation of the bio-hydrogen generated in a fuel cell.

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Section: Winery Wastewater Fermentationsupporting

confidence: 92%

Bio-Energy Generation from Synthetic Winery Wastewaters

et al. 2020

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“…Though the VFAs amount was less than this study, their distribution was similar to the feed of the proposed process. As listed in Additional file 1: Table S2, a 100 L reactor with kitchen waste produced another similar distribution of VFAs [32]. When the feed composition is different from this study for the up-scaling process, the amount of solvents is adjusted to maintain VFAs’ recovery with the same arrangement of extractor and distillation columns to the proposed process.…”

Section: Resultsmentioning

confidence: 99%

“…Various combinations of pretreatment and fermentation condition produced a large distribution of VFAs [32, 33]. The biomass pretreatment enhanced the abundance of a certain class of microorganism during fermentation, which resulted in a specific distribution of VFAs [34].…”

Section: Methodsmentioning

confidence: 99%

Eco-efficient recovery of bio-based volatile C2–6 fatty acids

Woo

Kim

2019

Biotechnol Biofuels

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Background Volatile fatty acids (VFAs) are produced by fermentation of various bio-sources and human wastes at minimal cost; sometimes, even sources having a prepaid processing fee were used. However, low concentrations of VFAs in water have prevented their commercial production, even with modern separation technologies, due to the high operating costs. We have applied newly developed solvents, selected by chemical structure similarity, to the separation of five different VFAs. Results Since most of the water was separated by extraction using hexyl acetate and nonyl acetate, the utilities necessary for solvent recovery and product purification were a fraction of those required by the existing VFAs’ separation processes. The solvents separated almost all the water in the feed at the extraction stage, consuming no energy. The energy use in this study is only 34% of the lowest case use among various processes of either distillation-only or combined extraction–distillation. Conclusions The performance evaluation of the proposed VFAs separation process showed that product recovery was 99% and acid purity was 99.5% with eco-scores of 70% lower than those of the current processes. Electronic supplementary material The online version of this article (10.1186/s13068-019-1433-8) contains supplementary material, which is available to authorized users.

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“…The main source of revenues was butyric acid, 80% of the revenues, followed by acetic acid (10%), hydrogen (7%), methane (2%) and digestate (0.01%). This assessment suggests that the huge scientific effort toward biohydrogen production optimization from organic waste [16,47,48,[53][54][55] may be re-focused into the production, separation, and purification of the organic acids produced during dark fermentation [13,19,21,[56][57][58]. It should be noted that the cost of the organic acids sub-route has also increased by 570% to 400 USD/t_VS_fw, when compared to the 60 USD/t_VS_fw of the previous sub-route.…”

Section: Economic Assessment Resultsmentioning

confidence: 99%

Increasing Profits in Food Waste Biorefinery—A Techno-Economic Analysis

Bastidas‐Oyanedel

Schmidt

2018

Energies

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The present manuscript highlights the economic profit increase when combining organic waste anaerobic digestion with other mixed culture anaerobic fermentation technologies, e.g., lactic acid fermentation and dark fermentation. Here we consider the conversion of 50 tonnes/day of food waste into methane, power generation (from CHP of biomethane), lactic acid, polylactic acid, hydrogen, acetic acid and butyric acid. The economic assessment shows that the basic alternative, i.e., anaerobic digestion with methane selling to the grid, generates 19 USD/t_VS (3 USD/t_foodwaste) of profit. The highest profit is obtained by dark fermentation with separation and purification of acetic and butyric acids, i.e., 296 USD/t_VS (47 USD/t_foodwaste). The only alternative that presented losses is the power generation alternative, needing tipping fees and/or subsidy of 176 USD/t_VS (29 USD/t_foodwaste). The rest of the alternatives generate profit. From the return on investment (ROI) and payback time, the best scenario is the production of polylactic acid, with 98% ROI, and 7.8 years payback time. Production of butyric acid ROI and payback time was 74% and 9.1 years.

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Volatile fatty acids as an added value from biowaste

Cited by 43 publications

References 25 publications

Bio-Energy Generation from Synthetic Winery Wastewaters

Bio-Energy Generation from Synthetic Winery Wastewaters

Eco-efficient recovery of bio-based volatile C2–6 fatty acids

Increasing Profits in Food Waste Biorefinery—A Techno-Economic Analysis

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