| 摘要 |
662,646. Purifying water. INFILCO, Inc. Aug. 4, 1948 [Sept. 13, 1947], No. 20584/48. Class 46 Adsorbable impurity such as oil, e.g. vegetable oils, saturated or unsaturated oils, is separated from polluted water by establishing a suspension of material philic to the impurity in a body of water undergoing treatment, maintaining in said suspension a circulation through a closed cycle path, passing impure water and fresh philic material into the circulating suspension, separating treated water from the circulating suspension and withdrawing it from the process and withdrawing philic material with adsorbed impurities from the process. In carrying out the invention, as shown in the flow diagram of known apparatus the body of water undergoing treatment is functionally divided into a lower mixing zone containing the suspension of oil-philic material and a superposed quiescent treated-water zone, the entering oily waste water being introduced, preferably continuously, into the suspension, e.g. in the mixing and reaction zone and additional oil-philic material being introduced, preferably continuously into the suspension, e.g. into the reacting zone which is continuously agitated. Clarified water is withdrawn from the upper surface of the suspension into the treated water zone. Oil-contaminated philic material is withdrawn from a concentrator equal in amount to the philic material added. The philic material may be sludge from a water softening plant, and the oil-contaminated sludge (calcium carbonate and carbon) withdrawn from the process may be of sufficiently high oil content that on drying it is burnable, e.g. in a furnace, or carbonized to form a source of oil-philic material which is fed back to the suspension in the treatment zone. This oil-philic material is retained in the suspension until the content of oil absorbed thereby is at least 50 per cent of the weight of the dry solids. The particles of oil-philic material should be of a size of the order of calcium carbonate particles formed in water softening. The suspension contains from 20 to 25 per cent solids by volume. Other oil-philic materials referred to are lime and iron, calcium carbonate and hydroxide, aluminium chloride and lime. Phenol may be removed by employing carbonated sludge or activated carbon as the philic material. |
