Comparison of Dry Versus Wet Milling to Improve Bioethanol or Methane Recovery from Solid Anaerobic Digestate

Monlau, Florian; Sambusiti, Cécilia; Barakat, Abdellatif

doi:10.3390/bioengineering6030080

Cited by 9 publications

(5 citation statements)

References 44 publications

(100 reference statements)

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“…Although some positive results have been obtained, both treatments are highly energy demanding and the energy input might be higher than the energy gain as extra methane. For instance, in the case of the study conducted by Monlau et al (2019) [33], the energy consumption of milling was estimated to be as high as 57.4 kWh/kg TS (or 206,640 kJ/kg TS). When applying ultrasonication, Garoma and Pappaterra (2018) [40] observed that a maximum of only 10.8% of the energy input could be recovered as methane when digestate was ultrasonicated at 14,868 kJ/kg TS.…”

Section: Mechanical Post-treatment-discussion and Perspectivesmentioning

confidence: 99%

“…Kaparaju and Rintala (2005) [18] obtained reduced methane yields in comparison to the untreated control, while [32] and Khan and Ahring (2021) [23] observed methane yields increments of up to 10%. In a study conducted by Monlau et al (2019) [33], the achieved methane yield increase was of 31%. Lindner et al (2015) [34] demonstrated that the varying degree of effectiveness of the mechanical treatment could be linked to the digester HRT from which the digestate was sampled.…”

Section: Comminutionmentioning

confidence: 99%

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Digestate Post-Treatment Strategies for Additional Biogas Recovery: A Review

Romio¹,

Møller²

2021

Sustainability

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Anaerobic digestion (AD) is a process in which microorganisms, under oxygen-free conditions, convert organic matter into biogas and digestate. Normally, only 40–70% of biomass is converted into biogas; therefore, digestate still contains significant amounts of degradable organic matter and biogas potential. The recovery of this residual biogas potential could optimize substrate utilization and lower methane emissions during digestate storage and handling. Post-treatment methods have been studied with the aim of enhancing the recovery of biogas from digestate. This review summarizes the studies in which these methods have been applied to agricultural and wastewater digestate and gives a detailed overview of the existing scientific knowledge in the field. The current studies have shown large variation in outcomes, which reflects differences in treatment conditions and digestate compositions. While studies involving biological post-treatment of digestate are still limited, mechanical methods have been relatively more explored. In some cases, they could increase methane yields of digestate; however, the extra gain in methane has often not covered treatment energy inputs. Thermal and chemical methods have been studied the most and have yielded some promising results. Despite all the research conducted in the area, several knowledge gaps still should be addressed. For a more thorough insight of the pros and cons within post-treatment, more research where the effects of the treatments are tested in continuous AD systems, along with detailed economic analysis, should be performed.

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Section: Mechanical Post-treatment-discussion and Perspectivesmentioning

confidence: 99%

Section: Comminutionmentioning

confidence: 99%

Digestate Post-Treatment Strategies for Additional Biogas Recovery: A Review

Romio¹,

Møller²

2021

Sustainability

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“…Bioethanol production technologies vary significantly depending on the type of feedstock, with corn to ethanol conversion being the most mature technology. The two most common conventional methods for producing ethanol from corn are dry and wet milling [108].…”

Section: Bioethanol Production Processmentioning

confidence: 99%

Comparative Review on the Production and Purification of Bioethanol from Biomass: A Focus on Corn

Assaf,

Mortada,

Rezzoug

et al. 2024

Processes

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In the contemporary era, conventional energy sources like oil, coal, and natural gas overwhelmingly contribute 89.6% to global CO2 emissions, intensifying environmental challenges. Recognizing the urgency of addressing climate concerns, a pivotal shift towards renewable energy, encompassing solar, wind, and biofuels, is crucial for bolstering environmental sustainability. Bioethanol, a globally predominant biofuel, offers a versatile solution, replacing gasoline or integrating into gasoline–ethanol blends while serving as a fundamental building block for various valuable compounds. This review investigates the dynamic landscape of biomass generations, drawing insightful comparisons between the first, second, third, and fourth generations. Amid the drive for sustainability, the deliberate focus on the initial generation of biomass, particularly corn, in bioethanol production is grounded in the current dependence on edible crops. The established utilization of first-generation biomass, exemplified by corn, underscores the necessity for a comprehensive examination of its advantages and challenges, allowing for a nuanced exploration of existing infrastructure and practices. To produce bioethanol from corn feedstock, various milling methods can be employed. Thus, this paper delves into a comparative assessment of dry-milling and wet-milling processes scrutinizing their efficiency, environmental impact, and economic feasibility.

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“…Fine milling of straw allows increasing the yield of reducing substances in its hydrolysis [14][15][16]. Milling of plant raw materials can be carried out both in dry and in wet form [17]. Also, using the apparatus is further improving, in particular, the fermentation, the separation of the biomass of yeast, the production of bioethanol.…”

Section: Introductionmentioning

confidence: 99%

Influence of discrete-pulse energy input on the distribution of plant biomass

Myronchuk¹,

Obodovych²,

Sydorenko³

2019

Ukr. food j.

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Introduction. The aim of this work is to determine the influence of dispersion modes of plant biomass of raw materials in the rotor-pulsating apparatus by the method of discrete-impulse energy input Materials and methods. The material of the studies was wheat straw and corn stalks, grinded on a disintegrator, which were mixed with water in certain proportions. The suspension was treated in a rotor-pulsating apparatus under different modes. The particle size distribution of the obtained particles was determined by the sieve method and the laser diffraction method. Results and discussion. It is determined that under the same conditions of treatment granulometric composition of the mixture of milled biomass of corn stalks with water after milling in the rotor-pulsating apparatus has a dispersity of 3-5% lower than the mixture of wheat. This can be explained by the different strengths of lignocellulosic fibers in the investigated plants. It was found that with the increase of a solid/water ratio from 1: 5 to 1:15, a dispersity of particles is reduced by 35-40%, and from 1: 5 to 1:10 by 3-5%. According to the authors, this is due to changes in the viscosity of the solution. Reducing the solid/water ratio from 1:15 to 1:10 for 10 cycles of the dispersion treatment in the rotor-pulsating apparatus leads to a decrease in temperature from 47 to 42º C (≈ 10%), but the productivity of the equipment increases 1.5-2 times, energy consumption decreases by 25-30%. The optimum parameters for milling of wheat straw or corn stalks in a rotor-pulsating apparatus are: the solid/water ratio is 1:10; the shear flow rate is 40•10 3 s-1 ; the frequency of flow pulsations is 3 kHz. The number of processing cycles is 25-30. It was determined that the granulometric composition of an aqueous dispersion of wheat straw or corn stalks at a solid/water ratio of 1:10 and treated in the rotor-pulsating apparatus with the frequency of pulsations of 3 kHz, shear flow rate 40•10 3 s-1 for 25-30 cycles allows the conclude that about 50% of the particles have a size in the range of 30-50 μm. Conclusions. Dispertion of plant biomass by the method of discrete-pulse energy input provides for obtaining 80% of particles with a size of 1-50 μm.

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Comparison of Dry Versus Wet Milling to Improve Bioethanol or Methane Recovery from Solid Anaerobic Digestate

Cited by 9 publications

References 44 publications

Digestate Post-Treatment Strategies for Additional Biogas Recovery: A Review

Digestate Post-Treatment Strategies for Additional Biogas Recovery: A Review

Comparative Review on the Production and Purification of Bioethanol from Biomass: A Focus on Corn

Influence of discrete-pulse energy input on the distribution of plant biomass

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