| 摘要 |
An improved and simplified purification of waste water making use of flotation and an apparatus therefor are described. The waste water may contain suspended particles having a density (almost) as the density of water. The purified liquid is led away from a region below the liquid surface and above the lower sludge take-off, preferably centrally in the outer vessel (5), and not over a saw-toothed edge. The apparatus may contain an outer and an inner vessel (5 and 6) where the outer vessel (6) may contain a bell (7) open at the bottom with upward directed leading-away canals for purified liquid. Possible downward directed shells (8A, 8B) between the vessel (5 and 6) further the purification of the liquid. The leading-to line (1) may have been introduced tangentially on the inner vessel (6). In the leading-to line there may be found specially worked out devices (21, 22 and 23) for pretreatment of the waste water. The purification and the use of the apparatus result in (much) purer led-away liquid than up to now, also in case of suspended particles having a density (almost) as the density of water. |
