There are sometimes real difficulties in ensuring that drinking water networks comply with turbidity standards. It is often necessary to implement filtration solutions. Hectron filters are a very good answer to this problem and offer alternative solutions to ultrafiltration systems which are often more expensive and cumbersome to operate and maintain.
Turbidity problems in drinking water production
Turbidity is a very important indicator for measuring water quality. It is in fact the reduction of water transparency when undissolved matter remains in suspension.
The standard requires that the turbidity of drinking water remains below 0.5 NTU. However, production plants and drinking water networks are increasingly confronted with turbidity peaks. These peaks often come from excess rainfall or long dry spells.
In such cases, they need to find economically and practically acceptable technical solutions to deal with this problem in a relatively automated way.
Hectron solutions for drinking water treatment
Hectron filters are increasingly used to protect drinking water systems. They can be found in individual installations, collective solutions, but also in city drinking water networks.
Hectron's filtration solutions are suitable for two purposes. In many cases it is necessary to protect reverse osmosis solutions or ultrafiltration systems. The installation of Hectron automatic filters upstream will reduce the fragility of these systems and provide them with less maintenance and a longer service life at a lower cost.
In the case of upstream protection of osmosis systems, it is better to install a very fine filtration. This is essential to preserve the membranes that ensure osmosis and make them last long enough. A filtration threshold of the order of 0.5 or 1 micron will often be necessary.
To protect ultrafiltration systems, it is not necessary to filter too finely. In general, 100 micron filtration will provide effective protection for ultrafiltration.
It should also be noted that the filters recommended in the Hectron range are compliant from a health point of view. The French Direction générale de la Santé has issued an official approval for the ACS (Attestation de Conformité Sanitaire) version of these filters: they are therefore perfectly suitable for installation on equipment intended for the production and transport of water for human consumption.
The filters of the AG range, which are available in ACS version, are recommended for drinking water treatment plants.
They have clear advantages:
They are fully automatic.
They do not require any consumables.
They offer very fine filtration thresholds.
The Hectron filters of the AG range have a very wide range of filtration thresholds, from 0.5-1 microns to 500 microns. They also have the great advantage that they consume very little water, because they have a cleaning system by suction ramp.
This system is triggered by a pressure differential measurement between upstream and downstream. This means that the cleaning process only starts when necessary and is therefore perfectly adapted to the particle load of the water. Finally, these models are ready to use and easy to install.
The Hectron AG series consists of 4 models (AG 100, AG 200, AG 300 and AG 400). These have common technical characteristics. First of all, they are all manufactured with a stainless steel casing. They also all have a maximum pressure of 5 bars. Finally, they also have in common a range of filtration thresholds from 0.5-1 micron to 500 microns. The differences between the models in the AG range lie in their flow rate and therefore their capacity. The AG 100 model has a maximum flow rate of 8 m3/h, while the AG 200 model can handle a maximum flow rate of 45 m3/h. Finally, the AG 300 and AG 400 models are characterized by maximum permissible flow rates of 120 m3/h and 340 m3/h respectively. There are still other differences between the models: the types of inlet and outlet as well as their diameter differ logically between the 4 models of this range.
Here are the inlet/outlet types and diameters available in the Hectron AG range: on the different models:
AG 100: 1" F thread
AG 200: 2" F thread, 3" M thread and DN80 flanges
AG 300: 3'' M thread and flanges of DN100 and DN150
AG 400: DN100, DN150, DN200 and DN250 flanges
Finally, as mentioned above, each of these models is available in an ACS certified version for a fully compatible use on water networks for human consumption.