| 摘要 |
Method for treatment of water by filtration on a granular material bed in order to reduce the content of contaminants therein, comprising steps consisting of: passing water to be treated into a reactor containing said bed along an upward flow at a speed that does not allow fluidization of the bed but does allow said granular material to migrate gradually towards the lower part of the reactor as filtration proceeds; continuously collecting at the foot of the reactor, by means of a pipe into which a gas is blown, a soiled granular material consisting of granular material and contaminants adsorbed thereon; physically cleaning and collecting said soiled granular material, in a continuous or intermittent manner, so as to obtain a cleaned granular material essentially free from contaminants; reinjecting the granular material thus cleaned into an upper part of said bed; characterized in that the granular material is an adsorbent material and in that it comprises: a continuous or intermittent step consisting of discharging at the foot of the reactor, during filtration, a part of the collected soiled granular material; and a continuous or intermittent step, consisting of introducing into the reactor, during filtration, new granular material in sufficient quantity to compensate for the discharged granular material portion. |
