Method for reducing industrial or urban effluent cod

Details Method for reducing industrial or urban effluent cod Method for reducing industrial or urban effluent cod

C - Chemistry, Metallurgy

02

F

362/47

C02F 1/54 (2006.01) C02F 1/52 (2006.01)

Patent

CA 2011869

CASE 3012 METHOD FOR REDUCING INDUSTRIAL OR URBAN EFFLUENT COD ABSTRACT A method for reducing industrial or urban effluent COD is described, comprising treating said effluents with an aqueous solution of alkaline and/or ammonium salts of humic acids prepared by the dry oxidation of coal with oxygen or oxygen/nitrogen mixtures at a temperature of between 120 and 350°C at an oxygen partial pressure of between 0.1 and 10 ata for a contact time of between 15 and 600 minutes, followed by extraction of the crude oxidation product with an alkaline and/or ammoniacal solution, characterised in that said aqueous solution is fed into effluent, the pH of which has been previously adjusted to between 1 and 3.5, to the extent that the humic acid salts which exhibit flocculating action are in a concentration of less than or equal to 2000 mg/l of effluent.

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