Enzymatic and catalystic enchancement of methane production from corn silage and grain residues

Dubrovskis, Vilis; Plume, Imants

doi:10.22616/erdev2017.16.n088

Cited by 6 publications

(7 citation statements)

References 15 publications

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“…However, sawdust microorganisms decompose slowly and methane production is relatively low. As we have verified above [1,2], the separation of lignocellulolytic materials, straw, was enhanced by the addition of enzymes. The purpose of this study was to determine whether and to what extent the addition of enzymes improves methane production from a mixture of bird droppings and sawdust.…”

Section: Introductionsupporting

confidence: 63%

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Broiler house litter processing by anaerobic digestion using enzymes

2020

Biointerface Res Appl Chem

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Sawdust is used as litter for broiler chickens. Mostly they are taken from the treatment of low-value deciduous trees. Keeping broilers for 40-50 days on a litter of sawdust, all the time, absorbs moisture well and mixes with bird droppings. When the broilers are moved to the slaughterhouse, these littered manures are removed from the barn and stored in stacks. They can be used to fertilize fields but only once or twice a year when the fields are fertilized, so they need to be spread over large areas and must be covered due to unpleasant odors. The other alternative is to use this manure with litter to produce energy, preferably biomethane. Sawdust is rich in lignin, cellulose and hemicellulose and is therefore slowly and incompletely broken down by bacteria. This study investigated the effects of the use of the enzymes alpha amylase and xylanase as well as the biocatalyst Metaferm on the mixture of bird droppings and sawdust actually produced in broiler houses. The 14 bioreactors of the laboratory were filled with raw materials and the appropriate additives were added. An average of 0.349 Lg-1dom methane was obtained from bioreactors where alpha amylase was added, but 0.368 Lg-1dom methane was added to xylanase. From the bioreactors where the biocatalyst Metaferm was added average yield was 0.329 Lg-1dom of methane. Addition of enzymes improved methane production, but the addition of biocatalyst Metaferm showed no improvement compared to control bioreactors.

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Section: Introductionsupporting

confidence: 63%

“…Metaferm contains multi enzymes, microelements and B group vitamins as well growing stimulators. Our previous studies show that the use of catalyst Metaferm has a positive effect on methane yield in anaerobic fermentation process of some biomass" [1,2].…”

Section: Introductionmentioning

confidence: 99%

Broiler house litter processing by anaerobic digestion using enzymes

2020

Biointerface Res Appl Chem

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“…Other researchers reported that anaerobic fermentation of old bread resulted in specific biogas yield 650 l kg -1 VS , and specific methane yield 313 l•kg -1 VS [7]. In previous studies, the addition of catalyst Metaferm resulted in improvement of the methane yield from substrates with rather difficultly biodegradable corn silage and dried grains [8]. Therefore, this study will continue to explore an effect of the additive Metaferm on more easily fermentable biomass.…”

Section: Introductionmentioning

confidence: 81%

Methane production from bread Kursu and potatoes Vineta waste and effect of catalyst metaferm

Dubrovskis

Plume

Straume

2018

Engineering for Rural Development

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There are significant quantities of different food wastes, which cannot be consumed for food in Latvia. Foods popular in Latvia are rye bread Kursu and potatoes Vineta. The significant part of this food was diverted to waste due to non-standard, surplus production, bad storage conditions, shelf life limitations and wastes accruing during food consumption by consumers. Food wastes, when disposed in landfills, will degrade easy in aerobic conditions releasing harmful gases, including gaseous nitrogen compounds and carbon dioxide. Also, food wastes disposal in landfills are limited now and expected to be avoided in future according to the respective EU Directive on disposal of easy degradable wastes. Damaged bread and potatoes peels may be utilised in the biogas production process. There is an interest to investigate the effect of usage of additives, e.g. catalyst Metaferm, to enhance the methane production during the anaerobic fermentation process. In previous studies, the addition of catalyst Metaferm caused the improvement of methane extraction from substrates with difficultly biodegradable corn silage and dried grains. Therefore, this study continues to examine the effect of the additive Metaferm on more easily fermentable biomass. To find the methane volume obtainable from bread Kursu and potato Vineta wastes, a study was conducted in 16 bioreactors at the temperature of 38 ºC. The specific methane volume 0.459 l•g-1 DOM or 0.515 l•g-1 DOM were obtained from rye bread Kursu or potatoes Vineta respectively, after 30 days anaerobic digestion (AD) process. The addition of Metaferm increases the methane yield by 5.4 % or 2.3 % from rye bread or potato wastes, respectively. Investigation results show that both food wastes can be utilised in biogas plants for energy production successfully.

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“…Total solid, ash and dry organic matter (DOM) contents of biomass were determined by known methods [12]. All substrates were carefully mixed together and filled in bioreactors before anaerobic fermentation (AF).…”

Section: Methodsmentioning

confidence: 99%

Co-fermentation of carrots, grain residues and potato chips

Dubrovskis

Plume

Straume

2018

Engineering for Rural Development

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Abstract. Different raw organic materials can be used for production of methane in the anaerobic fermentation process. Every kind of biomass has the specific methane production potential. In practice, different biomasses are utilised in the biogas plant at the same time often, so enabling co-fermentation at different proportions. The purpose of this study was to ascertain how the co-fermentation of various biomasses affects the methane yield compared to methane release from the same biomass during its mono-fermentation. Different factors may influence the methane yield, and most important are carbon: nitrogen (C: N) ratio, presence of easy degradable carbohydrates, trace elements and other substances needed to provide optimal microbial activity. Investigations were provided in 16 bioreactors with volume 0.75 l operating in batch mode at the temperature 38°C. Equal amounts of the carrots, grain drying residue, potato chips and inoculums were processed in 3 different groups of bioreactors to observe methane production from individual biomass, mixed with inoculums, in the monofermentation process. The same biomasses, in proportion 1:1:1 by weight, and inoculums were mixed together and co-fermented in the fourth group of bioreactors. 2 bioreactors were filled with inoculums only for control. It was found that average specific methane production per gram of dry organic matter in the co-fermentation process was higher compared to average specific methane production obtained from the same biomasses (carrots and grain residues) in the mono-fermentation process, when each biomass was fermented individually.

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Enzymatic and catalystic enchancement of methane production from corn silage and grain residues

Cited by 6 publications

References 15 publications

Broiler house litter processing by anaerobic digestion using enzymes

Broiler house litter processing by anaerobic digestion using enzymes

Methane production from bread Kursu and potatoes Vineta waste and effect of catalyst metaferm

Co-fermentation of carrots, grain residues and potato chips

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