A method and system for the treatment of sludge in a chemical pulp mill, comprising a step of hydrothermal carbonization HTC of the sludge stream, wherein the sludge stream is fed into an HTC facility, subjected to a temperature rise and pressure, Producing at least one solid fraction, at least one liquid fraction, and at least one gas fraction, wherein the solid fraction is supplied to a power boiler of the pulp mill and burned to generate steam; A method wherein the liquid fraction is combined with light black liquor from a pulp mill and fed to a black liquor evaporator of the pulp mill, and the resulting concentrated black liquor is burned in a recovery boiler of the pulp mill. system.
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