Assessing Two-Phase Anaerobic Digestion Systems for Demand-Driven Electricity and Biobutanol Transport Fuel at a Large Distillery
JOURNAL OF CLEANER PRODUCTION(2024)
Abstract
Decarbonisation of industry will necessitate innovative technological solutions that allow for both reduced carbon footprint and security of supply. Biogas systems can allow electricity production on-demand. This study evaluated and compared different two-phase anaerobic digestion systems for continuous volatile fatty acid (VFAs) production and demand-driven biogas production at a whiskey distillery using by-products as feedstock. The systems analysed were a two-phase continuously stirred tank reactor (CSTR) and a leach bed-expanded granular sludge bed reactor (LBR-EGSB) system. Both systems exhibited continuous VFA production (up to 10.4 g. L- 1 VFA made up of primarily butyric acid and acetic acid) and rapid biogas production, achieving peak flow rates within 30 min. The peak biogas production from the demand-driven EGSB was 3.1 L. L-1reactor. d-1 compared to the CSTR, which recorded 1.8 L. L-1reactor. d-1. Three kinetic models of both systems were assessed, which were able to describe the cumulative biogas production. A theoretical evaluation of processing butyric acid into biobutanol, to be blended with diesel, could produce a more sustainable transport fuel than diesel, reducing distillery-associated transport emissions by 16%.
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Key words
Decarbonisation of industry,Whiskey by-products,Demand-driven biogas,Biofuel,Biobutanol
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