| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a sewage treatment tank which can reduce power necessary for an agitator while keeping an improved sludge sedimentation preventive effect by improving the sludge sedimentation preventive effect by the agitator installed in the treatment tank. SOLUTION: The agitator 1 which is fitted with an agitating propeller blade and has an oscillation function for oscillating about an approximately vertical rotary shaft 2 is installed in the treatment tank 10.</p> |
