Method for controlling the oxygen content of the water at the ou

Details Method for controlling the oxygen content of the water at the ou Method for controlling the oxygen content of the water at the ou

1998-05-13

2000-02-15

Wyse, Thomas G.

Liquid purification or separation

Processes

Treatment by living organism

210739, 210 961, 210143, C02F 326, C02F 174

Patent

active

060248750

ABSTRACT:
The invention relates to a method of controlling the oxygen content of water at an outlet of a unit for dissolving oxygen in water. The method comprises measuring the oxygen content C.sub.o of the water at the outlet of the unit with a sensor, and comparing the oxygen content C.sub.o with a setpoint value C.sub.set. If the measured oxygen content C.sub.o is less than the setpoint value C.sub.set, a cycle of feeding oxygen to the unit is initiated. The feed cycle comprises a period T.sub.i of injecting oxygen into the unit, during which a valve controlling the flow rate of the oxygen feeding the unit is in the open position, and a pause period T.sub.p during which the valve is in the closed position. The pause period corresponds substantially to the inertia of the unit in responding to the oxygen being injected. The invention also relates to units for dissolving oxygen in water. Particular applicability is found in fish farming.

REFERENCES:
patent: 4255266 (1981-03-01), Moreaud
patent: 4818408 (1989-04-01), Hamamoto
patent: 5066392 (1991-11-01), Kneer
patent: 5506096 (1996-04-01), Helmo
patent: 5811289 (1998-09-01), Lewandowski et al.
Search Report for related European Patent Application No. EP 98 40 0988;.
Search Report for related French Application FR 9706606.

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