| 摘要 |
<p>The water filtration installation (100) comprises a filtration column (6) having an upper wall, a lower wall and a side wall defining an enclosure containing a layer (5) of granular material, a unit for supplying the water and air present inside the filtration column to an upper chamber defined by the granular material layer, side wall and in top of the column under pressure, and a unit for continuously controlling the air leak. The control unit comprises a pipe having an end connected to the upper wall of the filtration column, and another end sealed at a level of the side wall. The water filtration installation (100) comprises a filtration column (6) having an upper wall, a lower wall and a side wall defining an enclosure containing a layer (5) of granular material, a unit for supplying the water and air present inside the filtration column to an upper chamber defined by the granular material layer, side wall and in top of the column under pressure, and a unit for continuously controlling the air leak. The control unit comprises a pipe having an end connected to the upper wall of the filtration column, and another end sealed at a level of the side wall. The pipe allows to seal the escape of air contained in the chamber and water drops, and is connected at a top point of the upper wall of the column. The pipe is sized to provide a leakage end rising to a height of 0.5-1.5 m above the ground level on the underlying filtration column, and is equipped with a needle type air leakage control valve. The leakage end of the pipe is disposed in a gutter located at ground level. The filtered water passes through the granular material layer from the upper chamber, which is received in the lower chamber disposed immediately below the granular material layer. The lower chamber is connected to a discharge pipe of the filtered water after passing through the layer of granular material from the upper chamber. A unit is arranged for supplying washing liquid against the flow of the granular material layer from the lower chamber to the upper chamber. The upper chamber is connected to an evacuation pipe after the water passes through the granular material layer from the lower chamber.</p> |
