Liquid purification or separation – Recirculation – Serially connected distinct treating or storage units
Patent
1974-04-23
1978-04-11
Hart, Charles N.
Liquid purification or separation
Recirculation
Serially connected distinct treating or storage units
210197, 210219, 210220, C02C 110
Patent
active
040837858
ABSTRACT:
A plant for the biological processing by means of activated sludge, by oxidation with pure oxygen or oxygen-enriched air, followed by a settling step, of a liquid suspension containing oxidizable matters, includes, in addition to the settling tank, a plurality of oxidation tanks disposed in series, communicating with each other, and adapted to be supplied with oxygen or oxygen-enriched air and the suspension to be treated, while recycling the decanted sludge, the suspension to be treated flowing in the direction of from the upstream tank to the downstream tank. The oxygen or oxygen-enriched air is introduced into the downstream tank and the venting of the plant to the atmosphere takes place from the upstream tank, whereby the venting of the plant to the atmosphere is responsive to the oxygen content of the gaseous phase in the upstream tank where the oxygen demand and therefore the oxygen concentration have their highest values, and the flow of oxygen or oxygen enriched air from the downstream tank wherein the demand for this gas and the consumption thereof are appreciably lower, cause an immediate and continuous increment in the oxygen content of the gaseous phase in the upstream tank, thus ensuring a rapid response to any oxygen demand together with a regular and continuous oxygen supply to the plant.
REFERENCES:
patent: 3133017 (1964-05-01), Lambeth
patent: 3507393 (1970-04-01), Weis et al.
patent: 3547811 (1970-12-01), McWhirter
patent: 3547814 (1970-12-01), McWhirter
patent: 3547815 (1970-12-01), McWhirter
patent: 3764524 (1973-10-01), Stankewich, Jr.
Bernard Jacques
Renaudin Michel
Degremont, Societe Generale D'Epuration et D'Assainissement
Hart Charles N.
Spitzer Robert H.
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