| 摘要 |
PROBLEM TO BE SOLVED: To provide a sewage treatment tank in which the increase of the size of equipment is prevented, the space required for piping to be connected to this tank is reduced and sewage is prevented from being leaked directly from a piping joint part. SOLUTION: In the sewage treatment tank provided with a sewage flow-in pipe for allowing the sewage to flow in and a sewage flow-out pipe for allowing the sewage to flow out, the sewage flow-in pipe is installed so as to introduce the sewage from the upper surface toward the inside of a lower tank.
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