Effect of particle size reduction and ensiling fermentation on biogas formation and silage quality of wheat straw

Gallegos, Daniela; Wedwitschka, Harald; Moeller, Lucie; Zehnsdorf, Andreas; Stinner, Walter

doi:10.1016/j.biortech.2017.08.137

Cited by 65 publications

(39 citation statements)

References 24 publications

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“…During period III, the methane concentration in the biogas was 51.2 ± 14.5%, and the average specific biogas yield was 505 ± 40 mL N / (g VS *d). This means that the average specific methane yield (SMY) was found to be as high as approximately 259 mL CH4 /(g VS *d) on average, which confirms the results of Gallegos et al [7], who determined the methane potential for the substrate used here in fermentation batch tests. According to their results, 231 ± 5 mL CH4 / g VS was produced from Elodea straw silage.…”

Section: Resultssupporting

confidence: 89%

“…The substrate for the semi-continuous fermentation process was Elodea straw silage (TS = 29.8% WW; VS = 85.0% TS) that was developed by the researchers at the German Biomass Research Centre (Deutsches Biomasseforschungszentrum -gGmbH, DBFZ) in Leipzig as part of the "AquaMak" project [7]. This mixed silage contained waterweed biomass (Elodea nuttallii) and chopped wheat straw with a total solids (TS) of 30%.…”

Section: Digestates and Substratementioning

confidence: 99%

“…In cold climatic regions, substrate conservation is necessary in order to guarantee year-round substrate availability. For this reason, mixed silage of waterweed with wheat straw was recently developed [7]. The advantage of using a wheat straw is its good availability and its ability to take up water from waterweed.…”

Section: Introductionmentioning

confidence: 99%

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Anaerobic digestion of mixed silage of waterweed biomass and wheat straw in a long-term semi-continuous biogas production process

et al. 2018

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Background: As part of the maintenance of lakes and rivers, large quantities of aquatic biomass are produced every year. Neophytes, such as Elodea nuttallii, compete with native species and cause a disturbance to the ecosystem, which can manifest itself in the form of eutrophication. Aquatic macrophytes are not in competition with the production of food and animal feed and thus can be used in anaerobic digestion plants to replace a fraction of commonly used renewables such as maize or grass silage. Mixed silage of Elodea biomass with wheat straw was recently developed to allow for the conservation of mowed aquatic biomass. In this paper, the digestibility of this silage was tested in a long-term semi-continuous fermentation experiment with a duration of 212 days. Methods: A continous-stirred tank reactor with a working volume of 31 L was used for the semi-continuous fermentation experiment. The substrate Elodea-straw silage was supplied to the fermenter once a day. The samples of digestates were analyzed directly after sampling twice a week for total solids, volatile solids, VFA/TAC, NH 4 -N, acetate, propionate, butyrate, and water-solutle elements. The biogas composition was determined by means of gas chromatograph once a week.

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Section: Resultssupporting

confidence: 89%

Section: Digestates and Substratementioning

confidence: 99%

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Anaerobic digestion of mixed silage of waterweed biomass and wheat straw in a long-term semi-continuous biogas production process

et al. 2018

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“…Ensiling was conducted on a laboratory scale by means of ensiling fermentation as previously described by Gallegos et al. . Silages of fresh Elodea plant material and mixed silages of Elodea and chopped and ground straw at 30 and 45% total solids (TS) were tested.…”

Section: Methodsmentioning

confidence: 99%

Biomass potential analysis of aquatic biomass and challenges for its use as a nonconventional substrate in anaerobic digestion plants

Zehnsdorf

Moeller

Stabenau

et al. 2018

Engineering in Life Sciences

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Aquatic macrophytes are important components of aquatic habitats. However, the overgrowth of aquatic plants can cause severe problems for the management of bodies of water. As a result, these plants must be removed and disposed of as waste. However, the usage of this biomass as a substrate in biogas plants would appear to be more beneficial. The present study shows the advantages and barriers to the use of harvested aquatic biomass for energy production in Germany. The results cover several aspects of this issue, such as the question of biomass potential, the quality of the harvested aquatic plants, and ensiling for the purpose of conservation for anaerobic digestion. In addition, the social aspects of the de‐weeding in bodies of water are discussed.

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“…Analysis of literature data on the impact of substrate particle size, agitation strategy, agitation intensity, and duration on biogas production revealed mixed results. Some studies indicated that size reduction and mixing agitation were beneficial and improved biogas production. However, other studies reported that excessive substrate comminution and mixing attenuates methane production, process stability, and digester performance.…”

Section: Introductionmentioning

confidence: 99%

Biogasification of Cassava Residue for On‐Site Biofuel Generation for Food Production with Potential Cost Minimization, Health and Environmental Safety Dividends

Aso

Pullammanappallil

Teixeira

et al. 2019

Env Prog and Sustain Energy

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Convenient energy sources like biomethane and electricity are scarce commodities in cassava producing countries that depend on wood and charcoal for energy supply. Combustion of wood and charcoal releases substances that impair human health. In 2016, about 30 million metric tons of cassava peeling residues (CPR) were generated worldwide and discharged into the environment. Apart from deforestation, loss of biodiversity and soil erosion caused by felling vegetation for wood and charcoal recovery, discharge of CPR into the environment exacerbates environmental pollution and health hazards. This study presented biogasification experiments with CPR in a simple, batch, leach‐bed, unmixed fermentor. Biofuel yield ranged from 180 to 310 (mean of 252) L CH4 kg−1 VS−1 while fermentation time ranged from 19 to 33 (mean of 27) days. The substrate contained on average 33% dry matter of which 96% was volatile, and 71% volatile solids reduction was achieved. Furthermore, all electrical and thermal energy required for producing three cassava root food products (flour, gari, and starch) could be generated on‐site using CPR as substrate for anaerobic digestion. Consequently, energy paucity, environmental contamination, health hazards associated with cassava processing effluent, and combustion of wood and charcoal, could be mitigated by biogasification of CPR. © 2019 American Institute of Chemical Engineers Environ Prog, 38:e13138, 2019

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Effect of particle size reduction and ensiling fermentation on biogas formation and silage quality of wheat straw

Cited by 65 publications

References 24 publications

Anaerobic digestion of mixed silage of waterweed biomass and wheat straw in a long-term semi-continuous biogas production process

Anaerobic digestion of mixed silage of waterweed biomass and wheat straw in a long-term semi-continuous biogas production process

Biomass potential analysis of aquatic biomass and challenges for its use as a nonconventional substrate in anaerobic digestion plants

Biogasification of Cassava Residue for On‐Site Biofuel Generation for Food Production with Potential Cost Minimization, Health and Environmental Safety Dividends

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