0 a large container in which dirty or waste water is stored until all the solid material in it falls to the bottom and the water can be released for further treatment -- 沉淀池；沉积槽（一种大容器，其中贮存脏水或废水，直到水中所有固体物质沉淀到底部，水可放出供进一步处理）
The footnotes to the table say that all the technologies incorporate a primary sedimentation tank and, for biological treatment, an activated sludge process.
The sludge will become putrescent in a short time once anaerobic bacteria take over, and must be removed from the sedimentation tank before this happens.
Typically, a trickling filter is followed by a clarifier or sedimentation tank for the separation and removal of the sloughing.
Phosphate forms precipitates with the metal ions and is removed together with the sludge in the separation unit (sedimentation tank, flotation tank, etc.).
In 1930, the authorities installed sedimentation tanks which allowed the heavier solids to deposit.
Early efforts to combat these problems included the use of sedimentation tanks, disinfection by silver ionization and cleaning of the distribution network.
The third phase was split into two parts, which initially involved the building of new primary sedimentation tanks.
Once these were operational in 1969, the old sedimentation tanks were converted to become temporary storm sewage tanks.
