Liquid purification or separation – Processes – Treatment by living organism
Patent
1982-03-05
1984-03-20
Castel, Benoit
Liquid purification or separation
Processes
Treatment by living organism
210614, 210626, 210 961, C02F 312
Patent
active
044379927
ABSTRACT:
It is necessary for maintaining a good assimilating characteristic of microorganisms upon organic matter in an aeration tank to control a gas flow rate and a return sludge flow rate to optimum values. To this effect, it is necessary to know a concentration of organic matter or a organic load. In the present invention, it is confirmed that carbon dioxide (CO.sub.2) or nitrous oxide (N.sub.2 O) in an exhaust gas from the aeration tank has a correlation with it, and the aeration tank is controlled as N.sub.2 O or CO.sub.2 as an index. Furthermore, it is confirmed that CO.sub.2 formation rate has a good correlation with COD or BOD in the upstream half section of the aeration tank, whereas N.sub.2 O formation rate has a good correlation with COD or BOD in the latter half section thereof along sewage flow direction, and more improved control can be attained by a combination of both CO.sub.2 and N.sub.2 O indices.
REFERENCES:
patent: 3740320 (1973-06-01), Arthur
patent: 4071443 (1978-01-01), Gorski et al.
patent: 4130481 (1978-12-01), Chase et al.
patent: 4183810 (1980-01-01), Baenens et al.
Baba Kenji
Nogita Shunsuke
Saito Yukio
Watanabe Syoji
Castel Benoit
Hitachi , Ltd.
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