| 摘要 |
<p>PURPOSE:To treat waste water efficiently, by using water-floating particles for carriers of microorganisms, introducing the waste water in downflow, and aerating a carrier-packed layer from below to increase oxygen dissolution efficiency in the aerobic treatment. CONSTITUTION:Waste water (a) flows from an introducing pipe 5 through a distributor 3 formed on the upper part of a treating vessel 1 downward through a carrier particle packed tower 2, discharged through a treated water drain pipe, and recovered as treated water (b). At that time, the water (a) comes into contact with microorganisms and is purified in the layer 2, and a part of the treated water is pumped and recirculated for retreatment. An aeration device 4 is provided on the bottom of the vessel 1, and air and/or pure oxygen is blown into the layer 2 from below or to its lower part in <=50Nm<3>/m<2>.hr (unit sectional area) feed rate, to execute countercurrent contact between the water and the gas, thus permitting sufficient feed of oxygen necessary for aerobic microorganisms used for waste water purification.</p> |
