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.
Thermocatalytic and Chemical Treatment of Lignin-Aluminium Sludge and Utilization of the Resulting Adsorbent-Coagulant
I. V. Wolf, Yu M. Chernoberezhsky, E. I. Jepifantseva, A. D. Simonov; Thermocatalytic and Chemical Treatment of Lignin-Aluminium Sludge and Utilization of the Resulting Adsorbent-Coagulant. Water Sci Technol 1 August 1991; 24 (3-4): 357–360. doi: https://doi.org/10.2166/wst.1991.0491
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