Acidogenic fermentation of the organic fraction of municipal solid waste and cheese whey for bio-plastic precursors recovery – Effects of process conditions during batch tests

Girotto, Francesca; Lavagnolo, Maria Cristina; Pivato, Alberto; Cossu, Raffaello

doi:10.1016/j.wasman.2017.09.015

Cited by 40 publications

(23 citation statements)

References 76 publications

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“…In all bottle-reactors, pH was adjusted after inoculum addition. A pH value equal to 9 was shown to enable the best acidogenic fermentation condition in previous studies (Girotto et al, 2017a;Lavagnolo et al, 2018).…”

Section: Fermentation Testsmentioning

confidence: 87%

“…To date the possibility of valorising OP to recover biomolecules by means of acidogenic fermentation remains to be investigated; however, the high potential of this approach has already been proven for other organic substrates (Girotto et al, 2017a). Acidogenic fermentation enables the recovery of monomers capable of acting as precursors in bio-plastic production.…”

Section: Residues From Orange Juice Productionmentioning

confidence: 99%

“…All samples, with the exception of BSG after acid pre-treatment, were fermented at an initial pH 9. The choice of operating acidogenic fermentation at initial pH 9 was based on the findings of previous studies (Lavagnolo et al, 2018;Girotto et al, 2017a), with this pH level also being positively used elsewhere in literature (i.a. Dahiya et al, 2015).…”

Section: Aim Of the Studymentioning

confidence: 99%

“…Substrate concentration was 10 gVS/L in each bottle. Inoculum was added to reach an S/I ratio of 6 gVS/gVS (Girotto et al, 2017a). All fermentation tests were performed in triplicate.…”

Section: Fermentation Testsmentioning

confidence: 99%

“…SCG alone appeared to produce a lower amount of total VFA, but a considerable levels of acetic acid, comparable to those obtained with OP and BSG. The molecules (VFA, ethanol, and lactic acid) produced during acidogenic fermentation could be exploited for a variety of uses ranging from energy production, to bio-polymer production, or as intermediate feedstock chemicals (Girotto et al, 2017a). With a focus on bio-plastic production, these results suggest that OP and BSG represent biomasses particularly suited to use in implementing biorefinery approaches in which VFA is valorised to produce polyhydroxyalkanoates (PHAs).…”

Section: Figurementioning

confidence: 99%

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Biological Metabolites Recovery From Beverage Production Solid Residues Through Acidogenic Fermentation

2019

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Acidogenic fermentation was applied to evaluate the potential recovery of biological monomers as precursors in bio-plastic production. Three residual organic substrates from high-volume beverage sectors (coffee, orange juice, beer) were assessed: spent coffee grounds (SCG), orange peels (OP), and brewers' spent grains (BSG). Batch fermentation tests were set up. SCG and OP were studied as single substrates and combined to evaluate yields of target monomers (volatile fatty acids, ethanol, lactate) and to reveal interactions between the matrixes. NaOH pre-treatment was applied to SCG to enhance disruption of the lignocellulosic cell wall. BSG was studied without pre-treatment and following acid or alkaline pre-treatment, with acidogenic fermentation being initiated with two different initial pH values (7; 9). Acetogenic fermentation was achieved with all substrates, although with different yields of target monomers. In terms of total biological metabolite production, following alkaline pre-treatment, OP and BSG, both fermented at an initial pH 9, showed the best performance, yielding 62.6 g and 62.0 g target monomers per litre substrate. For all substrates, acetic and butyric acids were the most abundant products. In the case of OP fermentation, butyrate accounted for 57% (35.8 g/L) of the total. The BSG test with the highest total yield also achieved the highest acetate yield (36.7 g/L). The results confirm that OP and BSG should be considered a priority sustainable feedstock for the supply of biological monomers, particularly if polyhydroxyalkanoates are to be produced. SCG are better suited to aceto-oriented approaches, such as the production of polyvinyl acetate.

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Section: Fermentation Testsmentioning

confidence: 87%

Section: Residues From Orange Juice Productionmentioning

confidence: 99%

Section: Aim Of the Studymentioning

confidence: 99%

“…Substrate concentration was 10 gVS/L in each bottle. Inoculum was added to reach an S/I ratio of 6 gVS/gVS (Girotto et al, 2017a). All fermentation tests were performed in triplicate.…”

Section: Fermentation Testsmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

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