Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Responsive to fluid flow
Patent
1975-02-10
1976-04-20
Hart, Charles N.
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
Responsive to fluid flow
210 15, 210138, 210195R, 210202, 210220, C02C 108
Patent
active
039517888
ABSTRACT:
A method and apparatus to automatically control the concentration of microorganisms in an activated sludge waste treatment system, consisting of establishing certain factors by laboratory measurements and field observations to determine the quantity of organisms or "sludge" to be removed during a predetermined period of time in order to maintain the proper microbial balance for most efficient operation of the system by the provision of automatic control means to remove a predetermined amount of mixed liquor directly from the aeration tank during such predetermined period of time, allowing the sludge to settle in a settling tank to thicken same, returning the excess water back to the aeration tank, and removing the predetermined amount of concentrated sludge from the settling tank during such predetermined period.
The mechanism employed for practicing the process includes an aeration tank, a settling tank, either incorporated in the aeration tank or separate therefrom, provided with a conical hopper-like bottom, means to supply aerated liquor from the aeration tank to the settling tank, pumps to return supernated liquid from the settling tank to the aeration tank and to remove a predetermined amount of concentrated sludge from the settling tank, and control means for balancing the intake of aerated mixed liquor and the removal of the sludge to maintain the predetermined desirable biological balance in the system.
REFERENCES:
patent: 2285697 (1942-06-01), Durdin, 3rd
patent: 2486691 (1949-11-01), Travers
patent: 3272343 (1966-09-01), Caldwell
patent: 3325014 (1967-06-01), Williamson, Jr.
patent: 3419146 (1968-12-01), Koulovatos
patent: 3485749 (1969-12-01), Reilly
patent: 3563382 (1971-02-01), Regent
patent: 3679053 (1972-07-01), Koulovatos et al.
Ray Marshall W.
Ward Thomas D.
Harsco Corporation
Hart Charles N.
Spitzer Robert H.
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