Bioelectrochemical system for green energy production in a circular bioeconomy: conversion of solar energy and organic waste into hydrogen carrier gases

The actual global use of organic waste (OW) potentially suitable for the production of hydrogen carriers is about 6,14% with a total energy potential of more than 6,5 million MWh/year. It is known that among all possible methods of OW processing, the anaerobic digestion (AD) method is one of the most preferable. This paper presents the main methods of AD process intensification (two-stage AD, pre-treatment in a vortex layer apparatus, integration of a microbial electrolysis cell and AD, use of solar energy) combined into complex bioelectrochemical system (BES) using the principles of circular bioeconomy (production and consumption of goods, services and energy based on the use of biomass) focused on the production of green energy from OW using solar energy. The objective of this paper is to present the results of a comprehensive integration of the principles of circular bioeconomy, OW processing, and the use of renewable energy sources in the agricultural sector in terms of biomass conversion into green energy. The application of the developed complex BES allowed to convert solar energy into biomethane and thereby improve both the conversion of organic matter into gaseous hydrogen carriers and the quality of biohythane. The solar energy conversion coefficient was 11,6: 1 kWh of the received solar energy can be converted into 11,6 kWh of energy stored in biomethane when processing about 0,9 m³ of OW with a total energy yield of 71 kWh. The obtained results can be useful in scaling up BES used for sustainable energy supply with simultaneous processing of OW, allowing for environmentally friendly and energy-efficient utilization of OW with subsequent use of the effluent as a biofertilizer.

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