| 摘要 |
<p>PURPOSE:To accurately control the concentration of purified liquid and to enhance the effect of purification, by treating liquid to be purified, which is prepared by diluting raw water with preheated hot water and diluting water containing a controlled amount of unpreheated water, with active sludge in an aerating cell. CONSTITUTION:Gas liquor reserved in a gas liquor tank 3 is supplied to an aerating cell 5 by a pump 4, and its supply amount to the aerating cell 5 is maintained at a predetermined value by a controlling valve 6, which is operated in connection with a flow rate-controlling adjustor 6', provided in a supply pipe line. As diluting water to dilute the gas liquor, cold sea water of about 10-32 deg.C directly gathered from the sea and warm sea water above 30-45 deg.C heated by using it for cooling in a factory are conjunctly used. A controlling means 13 calculates the mixing ratio of the cold sea water C to the warm sea water H so that the mixed sea water becomes at a predetermined temperature, and instructs the opening rate of each controlling valve 10, 11 so as to obtain a predetermined amount of the mixed sea water.</p> |
