Dark fermentation of complex waste biomass for biohydrogen production by pretreated thermophilic anaerobic digestate

Ghimire, Anish; Frunzo, Luigi; Pontoni, Ludovico; d’Antonio, Giuseppe; Lens, Piet N.L.; Esposito, Giovanni; Pirozzi, Francesco

doi:10.1016/j.jenvman.2014.12.049

Cited by 116 publications

(44 citation statements)

References 41 publications

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“…Throughout the VFA fermentation experiment, the pH remained high (7.7) for CS, while fell to 5.7 with FW (Table ) mainly due to the acidification of the initially acidic substrate. Previously, it has been reported that lowering the process pH from neutral to acidic decreases propionic acid ratios and increases butyric (Dareioti et al, ; Ghimire et al, ) and valeric acid (Albuquerque, Eiroa, Torres, Nunes, & Reis, ) ratios, which explains the VFA profile in the present study. Additionally, the process pH is also known to affect the hydrolysis of substrates (Jankowska et al, ), where the acidic environment of the FW fermentation at a pH of around 6 most likely favored hydrolyzing enzyme production, which led to higher VFA yields with FW compared to CS fermentation (pH >7).…”

Section: Discussionsupporting

confidence: 67%

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Volatile fatty acids (VFAs) and methane from food waste and cow slurry: Comparison of biogas and VFA fermentation processes

et al. 2018

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The potential of various biomasses for the production of green chemicals is currently one of the key topics in the field of the circular economy. Volatile fatty acids (VFAs) are intermediates in the methane formation pathway of anaerobic digestion and they can be produced in similar reactors as biogas to increase the productivity of a digestion plant, as VFAs have more varying end uses compared to biogas and methane. In this study, the aim was to assess the biogas and VFA production of food waste (FW) and cow slurry (CS) using the anaerobic biogas plant inoculum treating the corresponding substrates. The biogas and VFA production of both biomasses were studied in identical batch scale laboratory conditions while the process performance was assessed with chemical and microbial analyses. As a result, FW and CS were shown to have different chemical performances and microbial dynamics in both VFA and biogas processes. FW as a substrate showed higher yields in both processes (435 ml CH4/g VSfed and 434 mg VFA/g VSfed) due to its characteristics (pH, organic composition, microbial communities), and thus, the vast volume of CS makes it also a relevant substrate for VFA and biogas production. In this study, VFA profiles were highly dependent on the substrate and inoculum characteristics, while orders Clostridiales and Lactobacillales were connected with high VFA and butyric acid production with FW as a substrate. In conclusion, anaerobic digestion supports the implementation of the waste management hierarchy as it enables the production of renewable green chemicals from both urban and rural waste materials.

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Section: Discussionsupporting

confidence: 67%

“…Tests were done in 500 ml bottles, with a liquid volume of 400 ml. The substrate/inoculum VS:VS ratio was 0.5 (Ghimire et al, 2015;Kuruti, Nakkasunchi, Begum, Juntupally, & Arelli, 2017) with inoculum volumes from 214 to 300 g per bottle (Table 1). Distilled water was added to achieve the desired liquid volume.…”

Section: Batch Experimentsmentioning

confidence: 99%

Volatile fatty acids (VFAs) and methane from food waste and cow slurry: Comparison of biogas and VFA fermentation processes

et al. 2018

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“…Therefore, the OP derived from the olive oil industry constitutes a promising biomass resource because of its potential utilization for energy purposes. It offers, at the same time, a solution to the management problems connected to this by‐product …”

Section: Resultsmentioning

confidence: 99%

Quantification of olive pomace availability for biogas production by using a GIS‐based model

Valenti

Arcidiacono

Chinnici

et al. 2017

Biofuels Bioprod Bioref

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Recently, to obtain biogas from biomass, an innovative system based on both sustainable intensification of crop rotation and use of by‐products was developed. This system derives from BIOGASDONERIGHT concept, which was put forward with the aim of making more sustainable biogas production. Among the by‐products that could be considered for the anaerobic digestion within this new concept, olive pomace (OP) has been the object of research studies aimed at evaluating its possible reuse for energy purpose in terms of economic sustainability. This possibility is of relevant importance to reduce the environmental burden caused by disposal processes of the residues of olive oil industries. However, to the authors’ knowledge, the amount of processed olives in olive‐producing areas, as well as the correct planning of OP use for energy purposes, has not yet been the object of research activities. Therefore, the aim of this research study was to compute the availability of OP, the main waste from the olive oil industry to be disposed of, by following a methodology which included a geographic information system (GIS) based model that allowed the computation of indicators suitable to describe OP potential production within geographical areas. In the first phase of the study, the spatial distribution of the olive‐producing areas in Sicily, a geographical area of the Mediterranean Basin highly representative of olive oil production, was analyzed. Then, a GIS‐based model, previously defined and applied to evaluate the amount of citrus pulp production, was applied to this case study to estimate OP potential production by the computation of a suitable index. The model required information about olive oil industries, which was gathered by performing specific surveys, and included the computation of indicators regarding olive‐producing areas, the amount of olive oil produced, and the amount of OP obtained. In the second phase of this study, the quantification of OP that can be available for biogas production was carried out at a provincial level in an area described by the highest potential of OP production. The total amount of OP available for biogas production corresponded theoretically to 1.9 million Nm3 biogas. This result proved that OP has a high potential to be converted into a resource for renewable energy production, such as biogas. Therefore, it constituted a potential solution to issues related to the environmental burden of OP disposal. Furthermore, the GIS‐based model applied in this case study, by giving the potential production of OP, could contribute to build an information base aimed at improving the sustainability of biogas sector. In this context, by considering the availability and distribution of other agricultural biomasses, the results of this study could be useful for applications in geographical areas where biogas sector is still developing. In fact, the obtained results could help identifying the best location of new biogas plants in terms of optimization of the logistics of biomasses supply. © 2017...

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“…For example, Fats and lipids in dairy waste and wastewater are not bio-accessible carbon and nutrient sources for H 2 producing microorganisms [14,15]. Hydrolysis of dairy waste materials is able to convert lactose to galactose and glucose from fats and lipids, improving substrate availability and suppression of methanogenic activity [15,16]. In addition, hydrolysis of cheese whey by hydrodynamic cavitation under alkaline condition inhibited the lactic acid bacteria and thus improved H 2 production yield [17].…”

Section: Hydrogenmentioning

confidence: 99%

“…The main advantage of the bio-hythane process is the low cost and high energy yield. The key bioengineering strategy for hythane production is to control the acidogenesis, acetogenesis and methanogenesis stages to reach a hydrogen/methane ratio suitable for hythane [16,18 ].…”

Section: Hythanementioning

confidence: 99%

Biofuels from food processing wastes

Zhang

O’Hara

Mundree

et al. 2016

Current Opinion in Biotechnology

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Dark fermentation of complex waste biomass for biohydrogen production by pretreated thermophilic anaerobic digestate

Cited by 116 publications

References 41 publications

Volatile fatty acids (VFAs) and methane from food waste and cow slurry: Comparison of biogas and VFA fermentation processes

Volatile fatty acids (VFAs) and methane from food waste and cow slurry: Comparison of biogas and VFA fermentation processes

Quantification of olive pomace availability for biogas production by using a GIS‐based model

Biofuels from food processing wastes

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