Biohythane production from two-stage anaerobic digestion of food waste: A review.

• Biohythane from two-stage anaerobic digestion (TSAD) of food waste (FW) is reviewed. • Main principle and influence factors of the TSAD of FW are identified. • Main strategies for enhancing biohythane from TSAD of FW are summarized. • Future research directions for biohythane from TSAD of FW are proposed. The biotransformation of food waste (FW) to bioenergy has attracted considerable research attention as a means to address the energy crisis and waste disposal problems. To this end, a promising technique is two-stage anaerobic digestion (TSAD), in which the FW is transformed to biohythane, a gaseous mixture of biomethane and biohydrogen. This review summarises the main characteristics of FW and describes the basic principle of TSAD. Moreover, the factors influencing the TSAD performance are identified, and an overview of the research status; economic aspects; and strategies such as pre-treatment, co-digestion, and regulation of microbial consortia to increase the biohythane yield from TSAD is provided. Additionally, the challenges and future considerations associated with the treatment of FW by TSAD are highlighted. This paper can provide valuable reference for the improvement and widespread implementation of TSAD-based FW treatment. [Display omitted] [ABSTRACT FROM AUTHOR]