Intermittent aeration type biological treatment process and system therefor
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United States of America Patent
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Apr 4, 1989
Grant Date -
N/A
app pub date -
Sep 3, 1987
filing date -
Sep 9, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention is concerned with an intermittent aeration type biological treatment process and system, wherein waste water is caused to flow into an aeration tank, and aeration is repeatedly stopped and started in the aeration tank to treat the waste water. Concentration values of dissolved oxygen during aeration of the waste water in the aeration tank are continuously measured by a dissolved oxygen concentration measuring device provided in the aeration tank. Deficient values of dissolved oxygen and dissolved oxygen variation values at predetermined time intervals are calculated from the values thus measured. The deficient values and variation values are integrated and processed by an oxygen requirement value calculating-integrating operation unit to calculate an oxygen requirement value for the activated sludge in the current aeration step. The necessary aeration time duration for the succeeding step is obtained from the value of this oxygen requirement value, to thereby control the operating time duration of the aeration device. By use of the process and the system, wasteful operating energy can be eliminated and satisfactory treated water can be constantly obtained.
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