Comparing pretreatment methods for improving microalgae anaerobic digestion: Thermal, hydrothermal, microwave and ultrasound

•The effect of thermal and mechanical pretreatments on microalgal biomass was compared.•The highest biomass solubilisation was attained for thermal pretreatment (95°C, 10h).•The highest methane yield increase (72%) was also attained for thermal pretreatment.•Biomass solubilisation and methane yield...

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