Method and device for lake restoration by oxygen-enriching of th

Details Method and device for lake restoration by oxygen-enriching of th Method and device for lake restoration by oxygen-enriching of th

1977-02-11

1978-08-15

Chiesa, Richard L.

Gas and liquid contact apparatus

Contact devices

Injector type

210221P, 210242A, 261120, 261123, 261124, B01F 304

Patent

active

041072405

ABSTRACT:
A method and a device for restoration of lakes by oxygen-enriching of the water. A lake having a depth exceeding 8-10 meters is oxygenated by air-treatment of the lower and colder hypolimnion layer only. Air is introduced into the hypolimnion and is prevented from rising and thereby reach the upper, warmer epilimnion layer by an air-entrapping bell-shaped housing which is located above the air introduction spot. The device comprises a vertical tube the upper end of which terminates within said housing and the lower end of which carries an air nozzle. The tube acts as an air-lift pump by which the water is circulated through the housing. The housing is provided with an air outlet at its uppermost part and water outlets at its lowermost part. To the water outlets there are connected ducts for distributing oxygenated water out over the lake. The outlet ducts are provided with air collecting chambers in which a secondary entrapping of air bubbles takes place. The device also includes stabilizing means as an anchor block and floates.

REFERENCES:
patent: 1619430 (1927-03-01), Mauran
patent: 2353195 (1944-07-01), Sims
patent: 2825541 (1958-03-01), Moll et al.
patent: 3183065 (1965-05-01), De Bolt
patent: 3193260 (1965-07-01), Lamb
patent: 3335082 (1967-08-01), Ullrich
patent: 3503593 (1970-03-01), Nelson
patent: 3547811 (1970-12-01), McWhirter
patent: 3643403 (1972-02-01), Speece
patent: 3671022 (1972-06-01), Laird et al.
patent: 3794303 (1974-02-01), Hirshon

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