| 摘要 |
The invention relates to a method for removal of surface scum by means of an apparatus particularly in a circular processing space (1), such as a clarification tank or like, wherein the apparatus comprises a surface scraper arrangement (2), by means of which surface scum on a surface of liquid in the processing space is being collected by one or more surface scrapers (2a) that rotate (w) in the processing space, and a surface scum removal arrangement (3) that exists essentially above the liquid surface (p) of the processing space and by means of which the surface scum is being removed through one or more outlet openings (3a) belonging thereto. The surface scum is being quided to the outlet openings by a guide part (2a1) that exists at an end of the surface scraper (2a) and that passes over the outlet openings (3a) while passing along guide surfaces (3b) reaching above the liquid surface. The guide part is preferably arranged to rotate (z) in an essentially vertical plane particularly in order to enable a rotating movement (w) of the surface scraper (2a) in a same level (t), when viewed in s direction of height (h) of the processing space. The apparatus comprises a closing arrangement (4), by opening (o) of which the surface scum, being guided to the surface scum removal arrangement (3) by the surface scraper (2a), is being flushed to the outlet opening (3; 3a) of the surface scum removal arrangement by using surface water of the processing space. The invention relates also to an apparatus operating according to the method. |
