Lignin compounds pass through conventional biological treatment. Purification effiency can be improved by chemical coagulation with e.g. aluminium sulphate. The generated aluminium sludge can be converted into adsorbent-coagulant by thermocatalytic and sequential chemical disposal. A thermocatalytic reactor with the temperature range from 400° to 700 °C and with copper-chromium catalyst was applied to treat aluminium sludge. The resulting adsorbent-coagulant removed colour up to 95 % and COD up to 75 % from diluted kraft black liquor.

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