| 摘要 |
<p>1,177,416. Treating sewage. UNION TANK CAR CO. 21 Feb., 1967 [16 March, 1966], No. 8220/67. Heading C1C. Aqueous liquids such as sewage are treated to remove water-soluble inorganic minerals by mixing with algae and exposing to light so that the algae photosynthesize the minerals. The process is controlled so that the algae selfflocculate and are separated.</p> |
