Abstract
Microalga-based fuels are promising solutions for replacing fossil fuels. This feedstock presents several advantages such as fast growth in a harsh environment and an ability to trap gases emitted from industries, thus reducing global warming effects. An efficient way to convert harvested microalgae into biofuels is hydrothermal liquefaction (HTL), which yields an intermediate product called biocrude. In this study, the elemental and molecular compositions of 15 different HTL biocrudes were determined by means of different techniques. Wild algae were cultivated in an industrial environment with plant emissions as a carbon source in fresh or seawater. It was notably observed that the culture medium had an influence on the biochemical composition and mineral matter content of algae. Thus, seawater algae were characterized by larger amounts of carbohydrates and mineral matter than freshwater ones, which also affected the oil yields and the light and heavy fractions of biocrudes.
Highlights
IntroductionMany studies have focused on the development of fuels based on renewable resources such as biomass
Barreiro et al comprehensively described the different reaction pathways occurring during the Hydrothermal liquefaction (HTL) process for proteins, lipids, and polysaccharides mainly found in microalgae [7]
HTL with alga batches obtained in realistic industrial conditions
Summary
Many studies have focused on the development of fuels based on renewable resources such as biomass. In this context, microalgae are interesting candidates due to their fast growth rate, cultivation on nonarable lands, and potential high lipid content. Microalgae are interesting candidates due to their fast growth rate, cultivation on nonarable lands, and potential high lipid content Due to their characteristics, they have been envisioned to help in the direct mitigation of CO2 produced by human activities. HTL consists of a thermochemical conversion of wet microalgae, avoiding any energy-consuming drying step of the biomass that produces a high-energy content biocrude, such as some gas, liquid, and solid byproducts. Barreiro et al comprehensively described the different reaction pathways occurring during the HTL process for proteins, lipids, and polysaccharides mainly found in microalgae [7]
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