Recently published at WE&T
Stretching continuous filtration for process water production and waste water treatment
Continuous flow filters with granular media have been widely used for various drinking water and wastewater treatment applications. In tertiary wastewater applications, they are used for the removal of solids, biochemical oxygen demand and nutrients. In surface water and groundwater treatment, continuous filters produce processed water. In bypass filtration of cooling water, continuous filters are very useful to keep the cooling water system clean, reduce chemical consumption and reduce blow-off volumes. New applications, where the emphasis is on the removal of micro constituents, stretch the scope further by using granular activated carbon as a filter medium.
Worldwide, continuous sand filters have been widely used because these filters are easy to operate and can handle high fixed and hydraulic loads.
A new innovative monitoring and control tool for continuous filters has been developed, tested and implemented. It is based on radio frequency identification (RFID) technology. To track the movement of sand grains, passive RFID tags have been applied to two effluents from the Dutch water treatment plant Wijlre, in the south of the Netherlands, and Kaatsheuvel.
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