Abstract
Microalgae are a non-food grade, fast-growing, and non-land competitive biomass with relatively high energy content. The high lipid and mineral contents of microalgae render it beneficial for the production of biofuels and value-added products. The complete energy-effective harnessing of microalgae potentials concerning biodiesel production is faced with drawbacks because of the energy-intensive steps required to harvest and dry microalgae. The limitations have impelled the search for alternative and low-cost utilization of microalgae in wet form for biofuel production. Anaerobic digestion (AD) is among the wet techniques for the valorization of microalgae that is gaining immense research attention because of its simplicity. Also, the products can be recycled to reduce material costs. This review is focused on the recent trends and comparison of the AD process to maximize energy recovery from microalgae biomass and co-digestion of microalgae waste coupled to biodiesel production (after lipid extraction), respectively. The yield of methane gas in these two processes is compared and the pros and cons of biogas production using microalgae biomass and microalgae waste considering that the former produces biofuels and the later value-added products are discussed.
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Funding
Laura Vargas acknowledges the CONACYT for the Ph.D. scholarship CVU 640397. The authors would like to acknowledge the financial support given by DGAPA-UNAM under Project Nos. IA203320 and IN 109319 and CONACYT under Project No. 424.
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Laura Vargas-Estrada: Literature survey and writing; Emilio Arenas: Literature survey; Adriana Longoria: Writing, review, and editing; Yaneth Bustos-Terrones: Review; Patrick U. Okoye: Writing, review, and editing; P.J. Sebastian: Writing, review, editing, and supervision. Joel Moreira: Review.
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Vargas-Estrada, L., Longoria, A., Arenas, E. et al. A Review on Current Trends in Biogas Production from Microalgae Biomass and Microalgae Waste by Anaerobic Digestion and Co-digestion. Bioenerg. Res. 15, 77–92 (2022). https://doi.org/10.1007/s12155-021-10276-2
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DOI: https://doi.org/10.1007/s12155-021-10276-2