Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Responsive to fluid flow
Patent
1977-06-30
1979-02-27
Spear, Jr., Frank A.
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
Responsive to fluid flow
210 7, 210 8, 210 14, 210 16, 210 18, C02C 117
Patent
active
041418220
ABSTRACT:
Activated sludge sewage treatment process comprising aerating a mixed liquor comprising phosphate-containing influent sewage material to cause the microorganisms present to take up phosphate, separating phosphate-enriched sludge from the mixed liquor, and settling the separated sludge in a phosphate stripping zone to form supernatant liquor and settled sludge. At least part of the settled sludge is maintained under anaerobic conditions to cause release of soluble phosphate and the resulting sludge containing released phosphate is contacted with a lower soluble phosphate content medium to effect phosphate enrichment of the supernatant liquor in the stripping zone, with at least a portion of the anaerobic sludge being recirculated to the aeration zone.
REFERENCES:
patent: 3235487 (1966-02-01), Westgarth
patent: 3236766 (1966-02-01), Levin
patent: 3385785 (1968-05-01), Forrest et al.
patent: 3386910 (1968-06-01), Forrest
patent: 3390077 (1968-06-01), Forrest
patent: 3654147 (1972-04-01), Levin et al.
BY Citizens Bank and Trust Company legal representative
Levin Gilbert V.
Tarnay Alexandra G.
Topol, deceased George J.
Hiltquist Steven J.
Hruskoci Peter A.
Spear, Jr. Frank A.
Union Carbide Corporation
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