| 摘要 |
<p>1,149,511. Activated sludge process. SIMONCARVES Ltd. 25 May, 1966 [17 June, 1965], No. 25597/65. Heading C1C. Primary sewage is aerated in the presence of activated sludge from previously treated sewage with the dissolved oxygen content of the aerated sewage passing to the settling being at least 30 per cent of saturation and the suspended solids concentration being between 6 and 30 thousand parts/million.</p> |
