TWO STAGE DIGESTION OF FOOD WASTE

Keywords: biogas, organic substrates, food waste, digestion, methane potential

Abstract

The Cabinet of Ministers of Ukraine approved the National Waste Management Strategy until 2030. In this regard, the processing of biodegradable waste, including food waste, using controlled biotechnological processes, in which organic substances are transformed into biogas, is relevant. The article is devoted to determining the methane potential of food waste during its digestion in two stages and specifying the mathematical model of the dynamics of biogas yield. A test was performed to determine the methane potential of food waste under the condition that the process of anaerobic methane digestion was divided into two stages - hydrolysis and methanogenesis. The methane potential of food waste was assessed. The mathematical model of the dynamics of biogas yield was refined, taking into account the obtained experimental data, which made it possible to determine the duration of the hydrolysis stage, the duration of the methanogenesis stage, the biogas potential of the organic substrate, and the intensity of biogas yield. The main problem solved in this study was to ensure the stability of biogas output under the condition of rapid decomposition of organic matter during the digestion of food waste. The problem was solved by dividing the digestion process into two stages. This is explained by the fact that in this way the degree of inhibition of the methanogenesis process by decomposition products at the stage of hydrolysis decreased. The practical significance of the obtained results lies in their use for the design of industrial biogas stations, complexes or plants in which food waste is digested. The duration of the stages for digestion of food waste makes it possible to determine the ratio between the volume of hydrolysis and methanogenesis reactors for industrial biogas plants. It was found that for the continuous mode of digestion of food waste, the volume of the container for storing the prepared daily loading dose and the hydrolysis reactor are the same. The yield of methane from a unit of the initial value of organic matter of food waste was estimated. It is shown that food waste is a promising organic substrate for obtaining biogas. In Ukraine, up to 500 million tons of waste is generated annually, a significant part of which is food waste from 35% to 49% with an organic matter content of 20% to 25%. The biogas potential of food waste is more than 500 m3 of biogas from a ton of organic matter. Bibl. 20, tabl. 6, fig. 2.

References

Matvyeyev YU. B., Heletukha H. H. rospects of energy utilization of solid household waste in Ukraine. Analitychna zapyska BAU № 22. – K.: Bioenerhetychna asotsiatsiya Ukrayiny, 2019. – 48 s. [in Ukrainian].

Prokhorenko A.V. Reconstruction and technical re-equipment of the solid household waste landfill in the village of Pidhirtsi, Kyiv region. Kremenchuk: TOV «NVP Ahroproyekt Ukrayina», 2019. 181 s. (in Ukrainian).

Official website of the Ministry of Environmental Protection and Natural Resources of Ukraine. [Online]. Available: http://www.mepr.gov.ua (Data zvernennya 15.06.2022 r). (in Ukrainian).

Dhamodharan K., Kumar V., Kalamdhad A. S. Effect of different livestock dungs as inoculum on food waste anaerobic digestion and its kinetics. Bioresource Technology. 2015. No. 180. Pp. 237-241.

Hobbs S. R., Landis A. E., Rittmann B. E., Young M. N., Parameswaran P. Enhancing anaerobic digestion of food waste through biochemical methane potential assays at different substrate: inoculum ratios. Waste Management. 2018. No. 71. Pp. 612–617.

Holliger C., Lactos H., Hack G. Methane production of full scale anaerobic digestion plants calculated from substrates biomethane potentials compares well with one measured on site. Frontiers in Energy Research. 2017. Vol. 5.

Porman E., Schnurer A., Bjorn A., Moestedt J. Serial anaerobic digestion improves protein degradation and biomass production from mixed food waste. Biomass and bioenergy. 2022. Vol. 161. DOI: https://doi.org/10.1016/j.biombioe.2022.106478.

Batstone D. J., Keller J., Angeladaki I. et al. The IWA Anaerobic Digestion Model No. 1. Water Science and Technology. London: IWA Publishing, 2002. Vol. 45. No. 10. Pp. 65 – 73.

Zvietering M., Jongenburger I., Rombouts F., Vant Riet K. Modeling of the bacterial growth curve. Applied and environmental microbiology. 1990. No. 56. Pp. 1875 – 1881.

Adamu A., Aluyor E. Empirical model for predicting rate of biogas production. Global journal for engineering research. 2013. Vol. 12. Pp. 63 – 68.

Deepanraj B., Senthilkumar N., Ranjitha J. Effect of solid concentration in biogas production through anaerobic digestion of rapeseed oil cake. Energy sources. 2021. Vol. 43. Iss. 11. Pp. 63 – 68.

Yahya M., Hermann C., Ismaili S., Jost C., Truppel I., Ghorbal A. Kinetic studies for hydrogen and methane co-production from food wastes using multiple models. Biomass and bioenergy. 2022. Vol. 161. DOI: https://doi.org/10.1016/j.biombioe.2022.106449.

State Standard EN 12048:2005. Fertilizers for solid and lime materials. Determination of moisture content by gravimetric method. Drying at 105 ± 2 °С. State Committee of Ukraine for Technical Regula-tion and Consumer Policy Publ. Кyiv. 2006. (in Ukrainian)

GOST 26714–85. Udobreniya organicheskie. Metod opredeleniya zoly. M. Gosudarstvennyy komitet SSSR po standartam, 1987. 8 p. (in Russian).

Automatical methane potential test system. Operation and maintenance manual. Lund. Bioprocess control Sweden AB. 2016. 95 p.

Pecar D., Gorsek A. Kinetics of methane production during anaerobic digestion of chicken manure with sawdust and miscanthus. Biomass and bioenergy. 2020. Vol. 143. DOI: https://doi.org/10.1016/j.biombioe.2022.105820.

Borazjani S., Capela I., Tarelha L. Over-acidification control strategies for enhanced biogas production from anaerobic digestion: A review. Biomass and bioenergy. 2020. Vol. 143. DOI: https://doi.org/10.1016/j.biombioe.2022.105833.

Kim M., Kim S. Condition of lag-phase reduction during anaerobic digestion of protein for high efficiency biogas production. Biomass and bioenergy. 2020. Vol. 143. DOI: https://doi.org/10.1016/j.biombioe.2022.105813.

Eder B., Shulʹts Kh. Biogas plants. Manual. Pereklad pid. red. Reddikh I. H. K.: Zorh Ukraine, 2011. 268 s. (in Ukrainian).

Renewable Energy Directive – RED II. Directive (EU) 2018/2001 of the European Parliament and of the Council of 11 December 2018. [Online]. Available: https://lexparency.org/eu/32018L2001 (Data zvernennya 15.06.2022 r)


Abstract views: 3
PDF Downloads: 4
Published
2022-09-20
How to Cite
Chetveryk, H. (2022). TWO STAGE DIGESTION OF FOOD WASTE. Vidnovliuvana Energetyka, (2(69), 90-98. https://doi.org/10.36296/1819-8058.2022.1(68)856