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

1990-03-05

1992-05-12

Silverman, Stanley S.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210725, 210729, 210724, C02F 154

Patent

active

051125013

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 or humic acids perpared by the dry oxidation of coal with oxygen or oxygen
itrogen mixtures at a temperture of between 120 and 350.degree. 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/1 of effluent.

REFERENCES:
patent: 2200784 (1940-05-01), Wallace
patent: 2415439 (1942-01-01), Nelson
patent: 2993006 (1961-07-01), Allen et al.
patent: 3872002 (1975-03-01), Musgrove
patent: 4764442 (1988-05-01), Calemma et al.
"Humic Acids By Dry Oxidation of Coal With Air Under Pressure, Analytical And Spectroseopic Characteristics", Proceedings of the 1989 International Conference on Coal Science, vol. 1, pp. 237-240, 1989.

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