At the start of the 1960s, sand was commonly used as a filtering agent in drinking water production plants. However, with use, the sand in the filters clogged up and had to be washed. So the majority of systems in existence at that time tended to limit the filtration speed, so as not to have to wash the sand too frequently.
The initial technology of the Aquazur filters launched by Degrémont is based on the use of a single layer of homogenous sand with washing by simultaneous return of pressurised water and air, with this allowing the accumulated impurities to be detached and removed. To improve Aquazur’s capacities, Degrémont incorporated two further elements into it: Firstly, the depth of the water above the sand was increased, thus allowing filtration speed to be increased, extended filtration cycles to be achieved and the quality of the filtered water to be improved. Secondly, surface sweeping was set up using a “V”-shaped side discharge channel, thus allowing the sludge-laden water that comes from the backwashing process to be pushed into the drains.
Aquazur V operates at high filtration speeds and has enabled a considerable reduction in the surface areas required. The advantage? The capacity to treat much larger volumes of water economically!
The Aquazur V filter is reliable, efficient and economical and also has the advantage of being simple to use, which makes it a universal process for all water treatment plants. Whether or not it is located after a clarifier, it contributes to achieving high-quality filtered water, vital for water that is intended for human consumption.