Influence of acetate-to-butyrate ratio on carbon chain elongation in anaerobic fermentation

Bioresource Technology, Journal Year: 2024, Volume and Issue: 395, P. 130326 - 130326

Published: Jan. 17, 2024

Language: Английский

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Optimising medium chain carboxylate production in xylan mixed-culture monofermentation

Bioresource Technology, Journal Year: 2025, Volume and Issue: unknown, P. 132124 - 132124

Published: Jan. 1, 2025

Language: Английский

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Assessment cascade biorefinery process from corn stover: furfural and volatile fatty acid production via anaerobic fermentation

Journal of Environmental Management, Journal Year: 2025, Volume and Issue: 384, P. 125516 - 125516

Published: April 27, 2025

A cascade biorefinery concept was proposed for the first time to produce furfural and subsequent volatile fatty acids production using corn stover as biomass. In step, Subcritical water pre-treatment used extract from hemicellulose into liquid phase, while solid rich in cellulose lignin, fermented anaerobically second step (VFA). subcritical treatment combined with CO2 pressurizing agent both a of biomass, fraction lignocellulosic After 1h at 180 °C 50 bar, yield 29 % obtained phase. Acetic formic acid were generated side products treatment. Following this treatment, 49.4 initial solids recovered, marked reduction content (from 33 5 %) an increase 39 62 lignin 21 %). This then subjected anaerobic fermentation. Inoculum type key parameter, 12 higher when cow rumen compared digestion (AD) sludge wastewater plant. Pre-treatment did not improve organic matter biodegradation, probably due its high content. However, showed be successful consecutive two value-added low value raw material.

Language: Английский

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Promoting Multi-Carbon Fatty Acids Production from Microbial Chain Elongation of CO₂/H₂ with Carbonaceous Materials

ACS Sustainable Chemistry & Engineering, Journal Year: 2025, Volume and Issue: unknown

Published: April 29, 2025

Language: Английский

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Treatment of food processing wastes for the production of medium chain fatty acids via chain elongation

Environmental Technology & Innovation, Journal Year: 2023, Volume and Issue: 33, P. 103453 - 103453

Published: Nov. 28, 2023

The production of medium chain fatty acids (MCFAs) through reverse β-oxidation was investigated both on synthetic and real substrates. From preliminary batch tests emerged that caproic acid maximized under an acetate/ethanol molar ratio 5:1 at neutral pH. This then adopted in different semi-continuous operating with amounts the two reactants. It MCFAs yield reached maximum level 6.7% when total substrate amount around 40-45 mmol/d, while process inhibited for values higher than 400 mmol/d. Semi-continuous using waste as substrates, namely food condensate, cheese whey, winery wastewater, confirmed results obtained Better performances were adequate acetate electron-donor compound naturally present. Therefore, a 25% 10.5% condensate acidic respectively. Regarding composition, dominant form but small concentrations octanoic also found where ethanol electron donor (synthetic substrates condensate). Octanoic not produced test lactic represented molecules (cheese whey). Condensate samples dominated by Pseudoclavibacter caeni abundance 38.19 33.38% respectively, Thomasclavelia (24.13%) Caproiciproducens (11.68%) most representative genus whey sample.

Language: Английский

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Differences on carboxylic acids bioproduction from soluble carbohydrates or proteins in a sequencing batch reactor: Deciphering the influence of the volumetric and specific organic loading rate

Journal of Water Process Engineering, Journal Year: 2024, Volume and Issue: 66, P. 106045 - 106045

Published: Aug. 31, 2024

Acidogenic fermentation (AF) has been extensively explored. However, the impact of operational parameters on AF led to inconsistent results. In this work, experiments were performed in a sequencing batch reactor (SBR) using simulated wastewaters solely containing soluble carbohydrates or proteins as carbon sources independently assess volumetric organic loading rate (OLRv) and specific (OLRs). When only used, main effluent components acetic butyric acids at OLRv 6.0 g COD L−1 d−1, while changing over 11.0 d−1 gave acid ethanol components. Conversely, if source consisted proteins, increasing OLRs had minimal performance composition. Also, case carbohydrate experiments, from 2.3 3.8 g−1 VSS promoted chain elongation reactions, caproic formation was also observed. Besides, highest tested work for protein (18.5 d−1), it obtained maximum isocaproic concentration mixed microbial cultures without adding any external electron donor. The SBR configuration proved be an adequate system, especially when used source, since makes possible keep low reduce hydrolysis limitations. Finally, bacterial genera detected reactors notably changed between both substrates. Future must focused identifying carboxylic producing-genera proteins.

Language: Английский

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Caproic acid production from short-chained carboxylic acids produced by arrested anaerobic digestion of green waste: Development and optimization of a mixed caproic acid producing culture

Bioresource Technology, Journal Year: 2024, Volume and Issue: 414, P. 131573 - 131573

Published: Oct. 12, 2024

Language: Английский

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A bacterial outlook on the caproate production from food waste

Reviews in Environmental Science and Bio/Technology, Journal Year: 2024, Volume and Issue: 23(3), P. 679 - 698

Published: July 15, 2024

Language: Английский

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Effect of inoculum sources on caproic acid production from food waste through lactate-based chain elongation: Properties and microbial succession

Journal of environmental chemical engineering, Journal Year: 2024, Volume and Issue: 12(6), P. 114186 - 114186

Published: Sept. 19, 2024

Language: Английский

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