Eliminating floating impurities from humus tanks, closes outlet and aerates just below surface, causing agglomeration and sinking

摘要

The outlet (5) is closed, then just below the water surface , air is blown in. Surface impurities collect together and sink. Finally, and if appropriate following a stilling phase, the outlet is re-opened. An Independent claim is included for equipment carrying out this procedure. The extraction unit (1) for purified water floats. Its inlet is just under the water level (6). It includes a weir (4) and/or opening for total overflow. An outlet system (12) is connected to the extraction unit. Preferred features: The extraction unit (1) has variable-buoyancy floats (3) with vertical guides (8) allowing change in height. Lower stops (9) on the guide, limit maximum descent.