Optimization of Straw Particle Size for Enhanced Biogas Production: A Comparative Study of Wheat and Rapeseed Straw

Energies, Journal Year: 2025, Volume and Issue: 18(7), P. 1794 - 1794

Published: April 2, 2025

Biogas production from lignocellulosic biomass, such as wheat and rapeseed straw, is an essential strategy for sustainable energy generation. However, the efficiency of anaerobic digestion depends on physical characteristics substrate, particularly particle size, which influences microbial accessibility biogas yield. This study aims to optimize straw size enhanced methane by evaluating different fractionation levels. The was processed using a hammer mill separated into three fractions (2.4 mm, 1 mm) alongside non-separated finely ground (2 samples. chemical composition analyzed X-ray fluorescence (XRF), key parameters pH, dry matter (DM), organic (ODM) were assessed. results indicated that had lower pH (6.05) DM than (7.01). yield analysis demonstrated varied with size. For samples achieved highest (132.87 m3 Mg⁻1), whereas decreased increased fragmentation, observed material (206.65 Mg⁻1). carbon-to-nitrogen (C/N) ratio in (153.82), potentially limiting activity, while finer more balanced ratios. These findings highlight importance mechanical pretreatment optimizing provide insights improving straw-based systems.

Language: Английский

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The Impact of Manure Use for Energy Purposes on the Economic Balance of a Dairy Farm

Energies, Journal Year: 2023, Volume and Issue: 16(18), P. 6735 - 6735

Published: Sept. 21, 2023

The use of methane fermentation in mesophilic conditions for the energy cow manure and additional co-substrates from farm can bring a small dairy (140 cows) financial benefits up to EUR 114,159 per year. Taking into account need pay emissions calculated as carbon dioxide equivalent, this profit could be reduced 81,323 With traditional direct manure, would drop by much 60% level 33,944 Therefore, introduction fees may significantly burden current farms. As has already been shown, just compacting covering (which costs approx. 2000 year 140 give almost twice profit—EUR 64,509 Although an investment biogas plant with cogeneration unit on family have payback period less than 6.5 years return capital employed 16%, most farms world will not able afford its construction without external subsidies. At same time, it make possible reduce 270 times—from 41,460 154 tons CO2eq year—and possibility preserving valuable nutrients minerals supporting soil properties digestate. seems necessary Europe introduce support system small- medium-sized type near future larger form so far.

Language: Английский

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The Influence of Temperature on Rheological Parameters and Energy Efficiency of Digestate in a Fermenter of an Agricultural Biogas Plant

Energies, Journal Year: 2024, Volume and Issue: 17(23), P. 6111 - 6111

Published: Dec. 4, 2024

This investigation specifically aims to enhance the understanding of digestate flow and mixing behavior across typical temperatures in bioreactors agricultural biogas plants, facilitating energy-efficient mixing. Experimental tests confirmed that exhibits non-Newtonian characteristics, allowing its be captured by rheological models. study validated rheology significantly varies with temperature, which influences resistance, efficiency overall energy requirements. Two models—the Bingham Ostwald models—were applied characterize behavior, model emerging as most effective for Computational Fluid Dynamic (CFD) simulations, given balance between predictive accuracy computational efficiency. Specifically, results suggest that, while three-parameter models, like Herschel–Bulkley model, offer high precision, their intensity is less suitable large-scale modeling where paramount. The small increase shearing process description does not compensate significant CFD calculation time. Higher were found reduce turn enables increased rates more extensive zones. enhanced mass transfer potential at elevated are especially pronounced peripheral areas bioreactor, farthest from agitators. By contributing a under realistic bioreactor conditions, this supports optimization use production. These findings emphasize temperature adjustments within could serve reliable control strategy maintain optimal production conditions minimizing operational costs.

Language: Английский

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Leverage of Essential Oils on Faeces-Based Methane and Biogas Production in Dairy Cows

Agriculture, Journal Year: 2023, Volume and Issue: 13(10), P. 1944 - 1944

Published: Oct. 5, 2023

Currently, there is an ongoing intensive search for solutions that would effectively reduce greenhouse gas emissions (mainly methane) into the environment. From a practical point of view, it important to methane from cows in such way as simultaneously trim digestive system and increase its potential production feces, which intended substrate used biogas plants. Such solution not only lower animal-based but also enable fuel (in chemical form) with high yield biogas, boost economic benefits use fossil fuels. We tested effect administering essential oil blend consisting 5.5% oils fats on dairy cow feces during fermentation. Three subsequent series (control experimental) were conducted fed total mixed ration (TMR) rich brewer’s cereals beet pulp, 20% dry matter (DM) diet. Cows experimental group received 20 g/cow/day blend, namely commercial additive (CA). The study showed CA can feces. It be concluded groups, approx. 15.2% 14.4% fresh basis 11.7% 10.9% more generated compared control group, respectively. Therefore, assumed nutrition improved dietary digestibility, increased efficiency organic production.

Language: Английский

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