Methane production from bread Kursu and potatoes Vineta waste and effect of catalyst Metaferm
2018
Dubrovskis, V., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia) | Plume, I., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia) | Straume, I., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia)
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·gE-1 DOM or 0.515 l·gE-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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