Method for Treating Water on Membranes Integrating Adsorption on Activated Carbon in the Form of Micrograins

Method for treating water for the purpose of reducing the content of organic matter, of micropollutants and of pathogenic agents therein, comprising the supplying of water to be treated directly into a membrane reactor containing at least one filtration membrane and an adsorbent material, stirring the mixture of water and adsorbent, and extracting treated water, characterised in that the adsorbent material consists of micrograins of activated carbon having a real density of at least 0.45, a settling velocity of 30 to 50 m/H, a specific surface area of 400 to 2500 m2/g, and an average particle size of between 600 and 1300 μm, less than 5% by volume of said grains having a size of less than 400 μm, in that the concentration of said activated carbon micrograins in said membrane reactor is maintained between 5 and 100 g/L, and in that no other granular or particulate material other than the activated carbon micrograins is used in said reactor, the stirring of said mixture of water and activated carbon micrograins in the membrane reactor being at least partially carried out by air injection into said mixture at a rate of 30 to 60 Nm3/m2·H and being sufficiently vigorous to avoid the deposit of activated carbon micrograins on said at least one filtration membrane