| 摘要 |
<p>1294304 Removing floating solids MACLEOD & MILLER (ENGS) Ltd 16 Jan 1970 [31 Dec 1968] 61809/68 Heading C1C In an activated sludge treatment plant, the floating solids on the top of the settling tank are removed by a paddle means which can be operated at an adjustably controllable rate.</p> |
