Supercritical water gasification of biocrude oil from low-temperature liquefaction of algal lipid extraction residue

•Lipid extraction by-product from algae was applied to produce biocrude oil.•Liquefaction of algal lipid extraction residue was performed and compared with lignocellulose.•Maximum biocrude oil yield of 78.5 wt% was obtained from liquefaction of algal lipid extraction residue at 225 °C.•The algal lipid extraction residue-derived biocrude oil was employed to produce gases via catalytic SCWG.•The maximum total gas yield was obtained with K2CO3.