Purification of waste stream from tanning process by adsorption on an adsorbent comprising a mixture of alumina and Y zeolite
AssigneeAluminum Company of America
InventorsJohn F. Bush, Hubert L. Fleming
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Abstract
An improved process is disclosed for the simultaneous removal of ammonia, sulfides and organic impurities from an impure aqueous stream from a tanning process which comprises contacting the impure stream with an adsorbent comprising a mixture of alumina and a Y zeolite.
Claims10
An improved process for the adsorption of ammonia and organic impurities from an effluent which comprises contacting the effluent with an adsorbent comprising a mixture of an activated alumina and a Y zeolite.
An improved process for the adsorption and removal of ammonia and organic impurities from an aqueous liquid which comprises contacting the impure aqueous stream with an adsorbent comprising a mixture of:
- (a) from 50 to 95 wt. % of an activated alumina having an average particle size of about 5 to 10 microns which has been activated by rapidly heating the alumina to a temperature of greater than 300.degree. C. for less than a minute;
- and
- (b) from 5 to 50 wt. % of a Y zeolite containing from about 2 to 7 wt. % sodium silicate, a Na.sub.2 O content of at least about 12.7 wt. %, and a silica to alumina ratio of about 4.5 to 6.0 with an average particle size of less than about 0.5 microns which has been activated by heating to a temperature of from 450.degree. to 550.degree. C.
Dependencies are inferred from the claim text.