sedimentation tank
noun [ C ] environment specialized uk/sed.ɪ.menˈteɪ.ʃən ˌtæŋk/ us/sed.ɪ.menˈteɪ.ʃən ˌtæŋk/
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）
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