| 摘要 |
<p>1,245,545. Treating sewage. A. SCHREIBER and M. DANJES. 8 Aug., 1969 [12 Aug., 1968], No. 39910/69. Heading C1C. In a plant for the aeration of sewage in an annular tank by rotation of air distributers in a circular path at more than 20 cm./sec. the water flow is braked to prevent rotational circular flow and thus there is an increase in the aeration.</p> |
