Fate and risk assessment of heavy metals in residue from co-liquefaction of Camellia oleifera cake and sewage sludge in supercritical ethanol

•COC addition presents synergetic effect on the risk decrement of HMs through SCE.•Temperature of 350°C was preferable for the immobilization of Cd and Cu.•Temperature of 300°C was beneficial to the stabilization of Zn.•The lowest pollution level of HMs was obtained with SC-350. The fate and risk as...

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