Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Responsive to fluid flow
Patent
1974-06-17
1976-07-06
Hart, Charles N.
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
Responsive to fluid flow
210 18, 210 45, C02C 120
Patent
active
039680363
ABSTRACT:
This invention relates to a novel process for the treatment of waste water from municipal and industrial sources by contacting the waste water with an activated sludge at conditions at which biological oxidation takes place. In this process various water-insoluble inorganic oxides selected from the group consisting of silica, alumina, and silica-alumina are combined with the sludge whereby increased rates of biological oxidation are obtained and the sludge shows increased settleability. In a most preferred embodiment of this method, the water-insoluble inorganic oxide is a spent cracking catalyst, that is, a zeolite which has been used in fluid cracking of hydrocarbon feeds and thus contains vanadium, iron, nickel, copper, and/or carbon. This catalyst may be recovered from aqueous scrubber solutions which are utilized to reduce stack losses in fluidized cracking processes and which, at present, present a solids waste disposal problem.
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Chen et al. "Feasibility Studies of Applications of Catalytic Oxidation in Wastewater," Water Pollution Res. Ser., EPA., 1971.
Liles Arthur W.
Schwartz Robert D.
Allocca Joseph J.
Baran Robert J.
Exxon Research and Engineering Company
Hart Charles N.
Hruskoci Peter A.
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