C - Chemistry – Metallurgy – 02 – F
Patent
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.
Calemma Vincenzo
Menicagli Roberto
Rausa Riccardo
Calemma Vincenzo
Eniricerche S.p.a.
Menicagli Roberto
Rausa Riccardo
Robic
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