Liquid purification or separation – Processes – Treatment by living organism
Patent
1993-04-27
1994-04-19
Wyse, Thomas
Liquid purification or separation
Processes
Treatment by living organism
210626, 210630, 210746, 210903, 210906, C02F 330
Patent
active
053043081
ABSTRACT:
In an intermittent aeration activated sludge process in which aeration and agitation is repeated alternately, a first aeration tank and a second aeration tank are connected to each other and an ORP meter is applied to each tank. In the first aeration tank, the sum of an aeration period and a denitrification period of an agitation step is controlled to a predetermined period T.sub.gs based on a time when a bending point appeared on an ORP curve in a previous cycle. In the second aeration tank, the sum of an aeration period and an agitation period is controlled to a predetermined period T.sub.ds longer than T.sub.gs based on a time when an ORP measured value reached a predetermined value in a previous cycle. Operations of the first and second aeration tanks are simultaneously transferred from the agitation to the aeration based on detection of the predetermined ORP value. As a result, a necessary anaerobic condition period is secured in the first aeration tank.
REFERENCES:
patent: 4425231 (1984-01-01), Fujimoto et al.
patent: 4431543 (1984-02-01), Matsuo et al.
patent: 4663044 (1987-05-01), Goronszy
patent: 4832847 (1989-05-01), Fujii et al.
patent: 4867883 (1989-09-01), Daigger et al.
Hatsumata Shigeru
Sasaki Kosei
Tsumura Kazushi
Yamamoto Yasuji
Fuji Electric & Co., Ltd.
Unitika Ltd.
Wyse Thomas
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