Hydrolytic-Acidogenic Fermentation of Organic Solid Waste for Volatile Fatty Acids Production at Different Solids Concentrations and Alkalinity Addition

Gameiro, Tânia; Lopes, Maria dos Anjos de Jesus Barros Monteiro; Marinho, Rita; Vergine, Pompilio; Nadais, Helena; Capela, Isabel

doi:10.1007/s11270-016-3086-6

Cited by 36 publications

(30 citation statements)

References 56 publications

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“…The results further reveal that a basic (alkaline) pH is beneficial in improving acetate production and percentage of the same in total VFA, in agreement with observations made by Dahiya et al (2015) and Gameiro et al (2016). A basic pH was also found to be beneficial in propionate production as reported in Figure 4 for BSG, in agreement with Gameiro et al (2016).…”

Section: Figuresupporting

confidence: 89%

“…Another possible explanation for the high recovery of total biological metabolites from the tested substrates lies in their good buffer capacity, as attested to by the observation of a moderate (not too low) pH at the end of acidogenic fermentation tests (see Tables 6 and 7). Indeed, when the fermented biodegradable waste prevents a sudden drop in pH values, maintaining a favourable pH range for acidogenic bacterial activity and preventing inhibition issues, VFA generation is promoted (Gameiro et al, 2016).…”

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: Figuresupporting

confidence: 89%

Section: Figurementioning

confidence: 99%

Biological Metabolites Recovery From Beverage Production Solid Residues Through Acidogenic Fermentation

2019

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“…For H 2 production by MMC from organic waste, an alkalinity optimum was found around 0.11 g CaCO 3 g COD −1 with excessive alkalinity resulting in increased osmotic pressure [146]. Improved VFA production has been noted for fermentation reactors processing cheese whey, the organic fraction of municipal solid waste or synthetic soft drink wastewater with higher alkalinity ranging from 2.4 to above 30 g CaCO 3 L −1 [122,147,148]. Comparison of buffered (pH ≈ 7) and unbuffered (pH drop to approx.…”

Section: Environmental Conditions That Influence Chain Elongationmentioning

confidence: 99%

“…Selection of the appropriate inoculum in biotechnological applications is critical to ensure catalysis of the required bio-conversion process. Cultures used for inoculating reactor experiments with complex substrates for carboxylate production contain a large variety of microorganisms (high richness) and include anaerobic sludges from AD [147] or wastewater treatment [133], marine sediments [107,129], rumen samples [30,40], mixtures of cultures [155] or microbiomes enriched in chain elongators obtained from lab-scale reactors [83,91,96]. For production of VFAs, H 2 or other MMC fermentation products, the inoculum can be physico-chemically pretreated in order to suppress methanogenesis, e.g., heat shock and/or acid/alkali conditioning [156,157].…”

Section: Effect Of Inoculum On Achieving Mccamentioning

confidence: 99%

Medium Chain Carboxylic Acids from Complex Organic Feedstocks by Mixed Culture Fermentation

et al. 2019

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Environmental pressures caused by population growth and consumerism require the development of resource recovery from waste, hence a circular economy approach. The production of chemicals and fuels from organic waste using mixed microbial cultures (MMC) has become promising. MMC use the synergy of bio-catalytic activities from different microorganisms to transform complex organic feedstock, such as by-products from food production and food waste. In the absence of oxygen, the feedstock can be converted into biogas through the established anaerobic digestion (AD) approach. The potential of MMC has shifted to production of intermediate AD compounds as precursors for renewable chemicals. A particular set of anaerobic pathways in MMC fermentation, known as chain elongation, can occur under specific conditions producing medium chain carboxylic acids (MCCAs) with higher value than biogas and broader applicability. This review introduces the chain elongation pathway and other bio-reactions occurring during MMC fermentation. We present an overview of the complex feedstocks used, and pinpoint the main operational parameters for MCCAs production such as temperature, pH, loading rates, inoculum, head space composition, and reactor design. The review evaluates the key findings of MCCA production using MMC, and concludes by identifying critical research targets to drive forward this promising technology as a valorisation method for complex organic waste.

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“…Ye et al (2018) [75] reported that a pH level of 6.0 was optimal for producing VFAs in which concentrations of butyric acid and acetic acid were dominant, whereas pH 8.0 increased propionic acid production. A previous study by Gameiro et al (2016) [76] reported that the formation of propionic acid was favored at a pH higher than 6.5. However, the accumulation of VFAs will trigger a drop in pH.…”

Section: Factors Affecting Acidogenic Fermentationmentioning

confidence: 93%

Volatile Fatty Acid Production from Organic Waste with the Emphasis on Membrane-Based Recovery

2021

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In recent years, interest in the biorefinery concept has emerged in the utilization of volatile fatty acids (VFAs) produced by acidogenic fermentation as precursors for various biotechnological processes. This has attracted substantial attention to VFA production from low-cost substrates such as organic waste and membrane based VFA recovery techniques to achieve cost-effective and environmentally friendly processes. However, there are few reviews which emphasize the acidogenic fermentation of organic waste into VFAs, and VFA recovery. Therefore, this article comprehensively summarizes VFA production, the factors affecting VFA production, and VFA recovery strategies using membrane-based techniques. Additionally, the outlook for future research on VFA production is discussed.

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Hydrolytic-Acidogenic Fermentation of Organic Solid Waste for Volatile Fatty Acids Production at Different Solids Concentrations and Alkalinity Addition

Cited by 36 publications

References 56 publications

Biological Metabolites Recovery From Beverage Production Solid Residues Through Acidogenic Fermentation

Biological Metabolites Recovery From Beverage Production Solid Residues Through Acidogenic Fermentation

Medium Chain Carboxylic Acids from Complex Organic Feedstocks by Mixed Culture Fermentation

Volatile Fatty Acid Production from Organic Waste with the Emphasis on Membrane-Based Recovery

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