Storing energy crops for methane production: Effects of solids content and biological additive

Pakarinen, Outi; Lehtomäki, Annimari; Rissanen, Sanna; Rintala, Jukka

doi:10.1016/j.biortech.2008.01.007

Cited by 96 publications

(48 citation statements)

References 22 publications

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“…In a report by Pakarinen et al (2008), biological additives such as LAB applied at a very high dose of 1.5 × 10 11 CFU g -1 of ensiled crop together with enzymes (cellulase, pectinase and xylanase), did not affect methane yield from ensiled mixtures of grasses, both from unwilted (15.6% DM) and wilted (30.4% DM) biomass.…”

Section: Silage Additivesmentioning

confidence: 92%

“…Thus, the ratio 28:1 was determined for C:N. Biogas production is related to mass of VS rather than mass of silage; typically one kg of VS produces 0.30 m 3 of methane (Nizami et al 2009). Pakarinen et al (2008) reported high methane yields from well preserved silages of both unwilted and wilted grass mixtures, but considerably lower yields from poorly preserved silages with secondary butyric fermentation and proteolysis, resulting in elevated contents of VFA with C 4 -C 6 carbon chain.…”

Section: Grass Silagementioning

confidence: 98%

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The required characteristics of ensiled crops used as a feedstock for biogas production: a review

Kalač

2011

Journal of Agrobiology

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Maize and grass silages are the main feedstock for anaerobic digestion in agricultural biogas plants. High-quality silage is necessary for high methane yields. Grasses should be cut and ensiled at leafy stages, until full heading, prior to an extensive lignification. Late ripening maize varieties should be harvested towards full ripening due to the increasing starch content in grains, and early to medium ripening varieties at the end of waxy ripeness. The substrate availability for methanogens is improved by fine chopping. Pretreatment processes of a thermal, chemical or biological nature attempting to disrupt lignocellulosic matter are economically demanding, including the application of enzyme hydrolysing structural polysaccharides. Application of lactic acid bacteria inoculants at ensiling seems to have an insignificant effect on methane yields. Some micronutrients necessary for methanogens growth are often deficient in the silages and particularly cobalt, nickel and iron should be supplemented. Maize silage has too low nitrogen content for methanogens growth. The high acidity of silage needs to be partially neutralised prior to anaerobic digestion.

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Section: Silage Additivesmentioning

confidence: 92%

Section: Grass Silagementioning

confidence: 98%

The required characteristics of ensiled crops used as a feedstock for biogas production: a review

Kalač

2011

Journal of Agrobiology

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“…Generally, the dry storage method includes sun drying, hot air circulation drying and mechanical ventilation (3,4). Compared with dry storage, wet storage is a promising alternative, providing several advantages including lower energy costs, lower dry matter losses and fire risk, and high harvest efficiency, which is conducive to the improvement of the biological digestibility for biorefinery utilization after storage (5)(6)(7)(8)(9). Silage, a representative wet storage, can preserve valuable moisture and cellular biomass components such as carbohydrates, which makes the substrate available for bioenergy production all year long, independent of harvest time (10).…”

Section: Introductionmentioning

confidence: 99%

Effects of Formic Acid or Acetic Acid on the Mixed-Storage Quality of Air-Dried Maize Stover and Cabbage Wastes and Microbial Community Analysis

Ren

Wang

Fan

et al. 2018

Food Technol. Biotechnol.

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SUMMARYA mixture of air-dried corn stover and cabbage waste was ensiled to preserve lignocellulosic biomass for use as biofuel. Furthermore, the effects of different fresh mass fractions (0.3 and 0.6 %) of formic or acetic acid on the mixed silage quality were evaluated to guarantee its quality. The application of formic or acetic acid prior to mixing the silage led to higher water-soluble carbohydrate fractions than the negative control, indicating that both acids contributed to preservation of water-soluble carbohydrates during storage for 170 days. The dry matter content was also increased after storage from 90 to 170 days. It was found that the content of neutral and acid detergent fibre, cellulose and holocellulose (the sum of cellulose and hemicellulose) in mixed silage treated with formic or acetic acid was significantly lower than that obtained in the negative control. The pH and the ratio of ammoniacal nitrogen to total nitrogen in mixed silage treated with acetic acid also significantly decreased. Furthermore, the addition of formic or acetic acid significantly weakened the fermentation intensity of lactic acid, depending on the ratio of lactic to acetic acid, as well as the ratio of lactic acid to total organic acids. The number of bacterial species and their relative abundance shifted during silage mixing, wherein microbial communities at phylum level mainly consisted of Proteobacteria and Firmicutes. The dominant bacteria were also observed to shift from Lactobacillus and Enterobacter in presilage biomass to Lactobacillus and Paralactobacillus. Specifically, Enterobacter disappeared after 130 days of storage. In conclusion, the addition of a low dose of acetic acid to fresh mass (0.3 %) could effectively improve the fermentation quality and is conducive to the preservation of the organic components.

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“…[4] One of the main advantages of using energy crops for anaerobic digestion is that energy crops can be easily stored so energy can be produced throughout the year and/or when the demand and/or price for energy are highest. [5] The most usual storage process is ensiling. Ensilig methods, adapted from the feed sector, are suitable storage methods to preserve fresh crops throughout the year for biogas production.…”

Section: Introductionmentioning

confidence: 99%

Anaerobic digestion of spring and winter wheat: Comparison of net energy yields

Rincón

Heaven

Salter

et al. 2016

Journal of Environmental Science and Health, Part A

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Anaerobic digestion of wheat was investigated under batch conditions. The paper compares the potential net energy yield between a Winter wheat (sown in the autumn) and a Spring wheat (sown in the spring) grown in the same year and harvested at the same growth stage in the same farm. The Spring wheat had a slightly higher biochemical methane potential and required lower energy inputs in cultivation, but produced a lower dry biomass yield per hectare that resulted in Winter wheat providing the best overall net energy yield. The difference was small both varieties gave a good net energy yield. Spring sowing may also offer the opportunity for growing an 2 additional over-winter catch crop for spring harvest, thus increasing the overall biomass yield per hectare, with both crops being potential digester feedstocks.

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Storing energy crops for methane production: Effects of solids content and biological additive

Cited by 96 publications

References 22 publications

The required characteristics of ensiled crops used as a feedstock for biogas production: a review

The required characteristics of ensiled crops used as a feedstock for biogas production: a review

Effects of Formic Acid or Acetic Acid on the Mixed-Storage Quality of Air-Dried Maize Stover and Cabbage Wastes and Microbial Community Analysis

Anaerobic digestion of spring and winter wheat: Comparison of net energy yields

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