Chemviron offers a range of solutions for the treatment of potable water, through a global service network. These services can be used individually or combined to meet your needs and treatment objectives that meet regulatory standards in an economical way. Chemviron is the largest supplier of granular activated carbon for the water industry, and has been a pioneer in its development in Europe. The FILTRASORB® range of activated carbon has been installed for over 40 years on municipal water treatment sites: more than 220,000 m³ have been supplied to more than 1,000 sites worldwide. In addition to the municipal and industrial potable water, the group Calgon Carbon, which includes Chemviron in Europe, is a leader in the supply of activated carbon to the potable water industry, providing more than 100,000 m³ per year for this essential application. The granular activated carbon can be used in fast filtration processes using gravity filters, slow filtration using sand sandwich filters or in mobile or fixed adsorbers. The filtration using granular activated carbon is a very common step in the production of potable water from groundwater or surface water. The refinement of water using GAC improves the quality by eliminating: compounds that are the origin of tastes and odors, pesticides and pesticide by-products, color, trihalomethanes and other disinfection by-products, algal toxins, chlorinated hydrocarbons and other volatile organic compounds, endocrine disruptors and many xenobiotic micropollutants, medication residues and residues of all our daily products. Organic pollutants in water are naturally very varied, from micropollutants such as pesticides to natural organic substances. Potable water treatment then requires the use of a granular activated carbon whose porous structure allows the adsorption of this wide range of compounds. The granular activated carbon must have sufficient pores so that molecules can be transported to the adsorption sites. The adsorption capacity for water treatment applications is very difficult to quantify by laboratory evaluation. Parameters such as the iodine index provide an indication of the porosity of the carbon, but in no way estimate the performance of the carbon for water treatment applications. For example, FILTRASORB® 200 has a greater capacity than FILTRASORB® 400 in terms of the removal of chlorinated compounds present in groundwater, although it is less active. The evaluation of the performance of the carbon must be done in real conditions of use, in contact with the real water to be treated.

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