Biogas Potential Assessment of the Composite Mixture from Duckweed Biomass

Abstract

The article presents the research results of anaerobic digestion processes in bioreactors of composite mixtures based on initial and residual biomass of Lemna minor duckweed and additives: inoculum (manure), food waste, and spent sorbents to determine biogas potential (biogas volume, methane content). Duckweed Lemna minor, which is widespread in freshwater reservoirs, is one of the promising aquatic vegetation species for energy use. Residual biomass is obtained by chemically extracting valuable components from the primary product. The purpose of the research was to evaluate the possibility of the energy potential of residual biomass of Lemna minor to reduce the consumption of fossil fuels and reduce greenhouse gas emissions. This is in line with the International Energy Agency (IEA) scenarios for the reduction of environmental impact. The obtained results confirm the feasibility of using this type of waste for biogas/biomethane production. The recommendations on the optimal composition of the mixture based on the residual biomass of Lemna minor, which will allow for an increase in biogas production, are given. The obtained data can be used in the design of bioreactors.

Carbon Dioxide Utilization Using Chlorella Microalgae

“…First of all, this is due to the ability of microalgae to absorb carbon dioxide from the emissions of thermal power plants, which will reduce the amount of carbon dioxide released into the atmosphere. In addition, when using biofilters based on microalgae, the spent absorbent is the biomass of microalgae, which can be used to create biofuel based on microalgae or as a co-substrate for the digestion of organic waste in order to increase biogas emissions [67,68]. This fact makes the development not only environmentally expedient but also economically profitable.…”

Current Status and Review of Waste-to-Biogas Conversion for Selected European Countries and Worldwide

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