In media filtration, the backwash flow rate needs to be controlled to prevent media loss.
Based in Cairns Northern Water manufactures, installs and services desalinators and water treatment equipment. Northern Water uses Maric Flow Control valves in their desalinators for controlling the flow of backwash water and providing consistent flow of water within their filtration equipment.
The desalination process includes a media filtration step. The filters used in this step are loaded with a single filtering layer of sand or of anthracite. The maximum head loss reached at the end of a cycle can vary from 0.2 to 2 bar, mainly depending on the thickness of the filter layer and on filtration rate.
The media filters are backwashed with water only. The backwashing process relies upon return water at a pre-determined flow rate. The flow rate has to be calculated depending upon the type and the granulometry of the media. The Backwash flow rate needs to be controlled to prevent media loss.
Maric Flow Control valves are fitted to ensure that the correct constant flow rate through the media is maintained. The Maric valves are chosen because they are simple to install, reliable, economical and tamperproof.
Northern Water believe the Maric valve is a quality product backed by good service.