A perspective on novel cascading algal biomethane biorefinery systems. (May 2020)

• Record Type: Journal Article
• Authors: Bose, Archishman; O'Shea, Richard; Lin, Richen; Murphy, Jerry D.
• Is Part Of: Bioresource technology. Volume 304(2020)
• Publication Date: 2020-05
• Subjects: Anaerobic digestion -- Biogas upgrading -- Microalgae -- Biorefinery -- Circular bioeconomy; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2020.123027
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Possibilities of utilising microalgae for biomethane generation are investigated. A decision tree for microalgae biorefinery is developed focussed on biomass composition. Multiple configurations of a cascading algal biomethane-biorefinery system (CABBS) are proposed. Techno-economic, sustainability and practical perspectives discussed. Abstract: Synergistic opportunities to combine biomethane production via anaerobic digestion whilst cultivating microalgae have been previously suggested in literature. While biomethane is a promising and flexible renewable energy vector, microalgae are increasingly gaining importance as an alternate source of food and/or feed, chemicals and energy for advanced biofuels. However, simultaneously achieving, grid quality biomethane, effective microalgal digestate treatment, high microalgae growth rate, and the most sustainable use of the algal biomass is a major challenge. In this regard, the present paper proposes multiple configurations of an innovative Cascading Algal Biomethane-Biorefinery System (CABBS) using a novel two-step bubble column-photobioreactor photosynthetic biogas upgrading technology. To overcome the limitations in choice of microalgae for optimal system operation, a microalgae composition based biorefinery decision tree has also been conceptualised to maximise profitability. Techno-economic, environmental and practical aspects have been discussed to provide a comprehensive perspective of the proposed systems.