| 摘要 |
The process consists of the following operations Stacking of wetted materials so as to provide a pile (4) so that the water flows through percolation over the height of the stack (4) saturating the material located in its lower parts, thus, displaying free water, Drainage of the free water in the lower parts of the stack as to prevent the level of free water from rising Sampling of the material drained from a “sampling” level sufficiently raised above that of the free water It is featured by the fact that the stack (4) being formed on a water drainage area (1) the part (6) of the stack located between the drainage and the sampling level, referred to as passive area, is used as filtering area in view of protecting the drains (8) placed in the drainage area thus preventing their clogging, this passive area (6) being preserved for the drainage of several piles stacked on its successively, before being replaced when it commences to clog Figure to be published: figure 2 |
