Postliminary treatment of food-waste digestate via combined hydrothermal carbonization and microbial fuel cell for bio-energy recovery: a comparative life cycle impact assessment†
Shraddha Yadav , Manikanta M. Doki , Makarand M. Ghangrekar , Brajesh K. Dubey
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引用次数: 0
Abstract
Anaerobic digestion (AD) is the predominant technique for transforming food-waste into biomethane, yet the dewatering and valorisation of the resultant digestate present a significant downstream technical challenge. This investigation provides an advanced digestate management approach for resource recovery through the synergistic integration of hydrothermal carbonization (HTC) with anaerobic digestion. The integrated system resulted in biomethane (∼466 mL g−1 VS) and biocoal (hydrochar) with a high calorific value (∼22 MJ kg−1). The effect of HTC operating conditions including reaction temperature and time on the coalification degree has been investigated. Additionally, the by-product of HTC, i.e., HTC process water was treated using the microbial fuel cell (MFC) with organic abatement efficiency of 76.0 ± 4.6% and power recovery of ∼4.41 W m−3. Further, the metagenomic analysis was conducted to affirm the high proliferation of specific electrogens (Clostridia) in the MFC. Distinctively, in this work, the impacts on the environment in eighteen different categories using life cycle assessment for the technologies AD, AD + HTC, and AD + HTC + MFC were also compared. The single score results demonstrated the least impact of the integrated AD + HTC + MFC on human health, ecosystem, and resource depletion. This highlights the potential of the integrated system for real-field applicability, sustainable digestate management, and bioenergy recovery.
期刊介绍：
Green Chemistry is a journal that provides a unique forum for the publication of innovative research on the development of alternative green and sustainable technologies. The scope of Green Chemistry is based on the definition proposed by Anastas and Warner (Green Chemistry: Theory and Practice, P T Anastas and J C Warner, Oxford University Press, Oxford, 1998), which defines green chemistry as the utilisation of a set of principles that reduces or eliminates the use or generation of hazardous substances in the design, manufacture and application of chemical products. Green Chemistry aims to reduce the environmental impact of the chemical enterprise by developing a technology base that is inherently non-toxic to living things and the environment. The journal welcomes submissions on all aspects of research relating to this endeavor and publishes original and significant cutting-edge research that is likely to be of wide general appeal. For a work to be published, it must present a significant advance in green chemistry, including a comparison with existing methods and a demonstration of advantages over those methods.
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