| 摘要 |
<p>1,212,457. Treating sewage. INGENIEURSBUREAU DWARS HEEDERIK EN VERHEY N.V. 28 June, 1968 [3 July, 1967], No. 30907/68. Heading C1C. In an activated sludge treatment of sewage with flow in a closed circuit 4, a surface aerator 7 also circulates the sewage around a partition 5 which separates the upstream and downstream flows of the aerator. The construction is to allow fluent merging of surfaces in the installation.</p> |
