Ultrasonic Energy Effect on Dark Fermentation by Ultrasound Application Alone and in Combination with Heat Shock

Pineda-Muñoz, Cuauhtémoc F.; Conde-Báez, Laura; Lucho-Constantino, Carlos Alexander; Medina-Moreno, S.A.; Jiménez-González, A.

doi:10.1007/s12155-020-10104-z

Cited by 7 publications

(10 citation statements)

References 55 publications

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“…Instead, the amount of butyric acid increased 2.7 times. The high HBut/HAc molar ratios for all heat shocked experiments (Figure 4B) indicate that hydrogen was produced via the butyrate pathway [35]. Without heat pre-treatment, the HBut/HAc ratio shows that hydrogen was accordingly formed via the acetate pathway.…”

Section: Discussionmentioning

confidence: 99%

“…Processes involving heterogeneous microflora are considered more suitable than pure cultures due to their simpler process control and efficient substrate conversion, provided that the medium undergoes pre-treatment [34]. Pineda-Muñoz et al succeeded in generating high hydrogen yields by combining heat shock and ultrasonic treatment but did not completely suppress methane production despite nearly identical heat shock conditions [35]. Singhal and Singh investigated the effect of different microwave intensities on an inoculum [33].…”

Section: Application Of Shorter Heat Shocks To High-loaded Dark Ferme...mentioning

confidence: 99%

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Microwave assisted acidification for green hydrogen and organic acids production

Barth,

Werner,

Otto

et al. 2023

Preprint

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Heat shocks are a favoured method used to trigger hydrogen production in dark fermentation. However, these treatments are often restricted to a very small volume, which is then inoculated into synthetic medium. Moreover, heat shocks are usually applied with an oven. This study explored the feasibility of applying heat shocks to the entire seed sludge using a microwave, a method not previously investigated. The experiments were conducted on a technical scale with 5 litre tank reactors. The highest productivity was achieved with an oven (0.95 mol H2/mol hexose), but the microwave was not significantly different and had the advantage of heating the sludge 6.4 times faster. The study also emphasized the repeatability of heat shocks, with microwave-assisted experiments showing low variation coefficients averaging 29%. The approach is already economically sustainable with high-temperature heat pumps with a COP of 4.3, enhancing its practical relevance.Highlights-The entire reactor content of 3.5 litre was heat shocked.-Heat shocks economically boosted dark fermentation hydrogen yield.-Heat pumps with COP of 4.3 would allow energetic net gain due to heat shocks.-Oven and microwave-based heat shocks are not significantly different.-Microwaves heat sludge 6.4 times faster than ovens.-Heat shocks inhibited methane production completely.-Heat shocks increased particularlyClostridium sensu stricto1 and 11.-Hydrogen could be enriched from sucrose, but not from lipids or proteins.

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Section: Discussionmentioning

confidence: 99%

Section: Application Of Shorter Heat Shocks To High-loaded Dark Ferme...mentioning

confidence: 99%

Microwave assisted acidification for green hydrogen and organic acids production

Barth,

Werner,

Otto

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Initially, the inoculum was treated by heat shock for 0.5 h at 105°C as recommended [25,26]. Later, the initial pH of 7.84 was lowered by HCl to pH 5.5 and applied to the DF process.…”

Section: Methodsmentioning

confidence: 99%

Microbial Biogas Production From Pork Gelatine.

Sołowski

2021

Preprint

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Dark fermentation of collagen (gelatine) results are shown in this research. The concentrations of applied gelatine were of VSS (volatile suspended solids) from 10 g VSS/L to 30 g VSS/L. The initial process pH was 5.5, depending on concentration reached pH values from 7.5 to 7.8 after 55 days. Although inoculum was heat-shocked in the case of 30 g VSS/L of collagen the process was hydrogenotrophic anaerobic digestion. In collagen concentration below 30 g VSS/L, hydrogen production was dominant only in the first 5 days of experiments. Then there also changed from dark fermentation into hydrogenotrophic methane production. In the case of optimal biogas production was due to accumulative production for a concentration of collagen 20 g VSS/L: 147.2 mL of hydrogen and 57.23 L of methane. In the case of optimal biogas production was due to accumulative production for a concentration of collagen 20 g VSS/L: 147.2 mL of hydrogen and 57.23 L of methane. The optimal hydrogen and methane yields were for concentration 10 g VSS/L (7.65 mL H2 /g VSS, and 3.49 L CH4/ g VSS). In 10 g VSS/L was also the lowest accumulated emission of hydrogen sulphide (10.3 mL of H2S), while the lowest yield was for 30 g VSS/L (0.44 mL H2S /g VSS). After a lag time, the hydrogen production and hydrogen sulphide grew with a specific ratio depending on concentration. Collagen, a protein with known amounts of sulphur allowed determining the origin of hydrogen sulphide in biogas. The hydrogen sulphide emission and sulphur added analysis proved that hydrogen sulphide origins in biogas from bacteria remains more than from substrate.

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“…Hydrogen yield of 23.2 mmol/min per gram of Mg 2 Al(OH) 7 nanosheets was reported in 2019. 2020 [132] Ultrasound (US) coupled dark fermentation, and heat shock (HS) route was used for the synthesis of hydrogen Frequency = 40 kHz Temperature = 20 0 C Ultrasound specific energy (USE) = 20.5–102.5 kJ.L −1 Heat shock parameters = 45 min, 85 0 C Optimised USE for anaerobic sludge treatment = 41–61.5 kJ/L when only US was used, 61.5–82 kJ/L when US was used along with HS. Only US and US + HS had 79.5% and 19.6% more H 2 yield, respectively than HS.…”

Section: Hydrogen Productionmentioning

confidence: 99%

A review on recent advances in hydrogen energy, fuel cell, biofuel and fuel refining via ultrasound process intensification

Zore

Yedire

Pandi

et al. 2021

Ultrasonics Sonochemistry

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Highlights A detailed review of ultrasound enabled mechanism and its disparate applications have been presented. Emphasis is made on the sonochemical routes for hydrogen production and their advantages. Recent research studies on the synthesis of materials for hydrogen storage have been reported. Sonochemistry relevance in the fuel cell, biofuel technology and fuel refining have been discussed.

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Ultrasonic Energy Effect on Dark Fermentation by Ultrasound Application Alone and in Combination with Heat Shock

Cited by 7 publications

References 55 publications

Microwave assisted acidification for green hydrogen and organic acids production

Microwave assisted acidification for green hydrogen and organic acids production

Microbial Biogas Production From Pork Gelatine.

A review on recent advances in hydrogen energy, fuel cell, biofuel and fuel refining via ultrasound process intensification

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