| 摘要 |
A circular waste water treatment basin has a U-shaped cap holding bio-degradable oil or anti-freeze. A circular waste water treatment basin has a radial sprinkler or scraper gantry which continually moves around the basin, powered by a motor and drive wheel running on the surrounding wall. The wall has a cap which is a fluid-tight U-shaped channel filled with a water-immiscible anti-freeze liquid especially bio-degradable oil.
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