| 摘要 |
A sewage treatment tank for aeration of raw sewage. The tank comprises an aeration compartment and a clarifying compartment separated by a vertical baffle-like wall having a steeply inclined lower portion which provides a hopper-like bottom in the clarifier compartment. A submerged pump is provided in the aeration compartment having an outlet discharging into the aeration compartment with specially devised aspirating means for drawing air through the outlet by aspiration to mix with the raw sewage discharged through the outlet to provide a high velocity air fluid stream for aerobic treatment. A separate curved baffle at the bottom of the lower portion of the vertical baffle imparts a circular roll-like stream to the aerating stream and by close spacing to the tank bottom provides a narrow throat-like passage to the clarifier compartment which facilitates drawing any heavy solids therein back to the aerating compartment for further treatment. The ratio of the aeration compartment volume to clarifier compartment ranges from greater than 1 to 1 to as much as 5 to 1 to provide for extensive aeration. A specially devised skimmer to skim solids from the clarifier compartment by aspiration is provided at the discharge side of the pump.
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