Stretching continuous filtration for process water production and wastewater treatment.

Continuous granular media upward flow filters have been widely used for various drinking water and wastewater treatment applications. In wastewater tertiary applications, they have been implemented for solids, biochemical oxygen demand, and nutrient removal. In surface water and ground water treatment, continuous filters produce processed water. In cooling water bypass filtration, continuous filters are very useful to keep the cooling water system clean, reduce chemical consumption, and blowdown volumes. New applications, focusing on removal of microconstituents are stretching the operating window further by using granular activated carbon as the filter medium.

Globally, continuous sand filters have been implemented in large numbers, as these filters are easy to operate and are capable of handling high solids 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 monitor the movement of sand grains, passive RFID tags are applied at two effluent Dutch water resource recovery facility Wijlre, in the south of the Netherlands and Kaatsheuvel.

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