Method of lowering the color of effluent which contains aryl azo

Details Method of lowering the color of effluent which contains aryl azo Method of lowering the color of effluent which contains aryl azo

1978-08-28

1980-03-25

Hart, Charles N.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

210 51, 210 56, C02B 120, C02C 502

Patent

active

041949730

ABSTRACT:
Effluent which contains aryl azo- and/or aryl nitro-containing compounds is treated to remove the color by contacting the effluent with Fe(II) in the presence of iron at a temperature and for a time sufficient to cause reduction of the aryl azo and aryl nitro groups of the effluent. Effluent containing metallized compounds may be treated in the same manner and then subjected to alkaline neutralization to remove the metal from the effluent.

REFERENCES:
patent: 3461067 (1969-08-01), Matsumoto et al.
patent: 3575853 (1971-04-01), Gaughan et al.
patent: 3752759 (1973-08-01), Burg et al.
patent: 4005011 (1977-01-01), Sweeny
patent: 4045171 (1977-08-01), Lancy
Porges et al. "Chemical Precipitation of Textile Wastes and Studies of pH Control," Sewage Works Journal, 9/1939, pp. 828-863.

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