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Until now, the drinking water production in Ouddorp on the west coast of the Netherlands has been designed so that surface water was filtered directly through sand dunes. After this process, the water was pumped for disinfection and further distribution to consumers. The surface water is becoming increasingly polluted by foreign particles, bacteria and toxic algae. In order to meet the future water supply and preserve the dunes, it has been decided to introduce an additional filtration stage for the raw water before it is led into the sand. In order to find the most economical and safest alternative, tests have been carried out. Dynasand, Toveko and pressure sand filters were included in these investigations.
Ferric chloride was dosed directly into the raw water using a static mixer. This pipe eventually branched out into three parallel pipes, one for each individual filter. The Dynasand filter was a type DST 075 with a 1.5 m high filter bed, the Toveko filter a standard S-75 filter with a 1 m filter bed. The pressure sand filter had a 2.5 m high filter bed consisting of 50% hydroanthracite and 50% sand. This type of filter was equipped with automatic backwashing. Turbidity was measured continuously.
After a long period of observation of the filters, and after the end of the test period, the values as shown below were obtained. Due to the relatively clean incoming water, the pressurized sand filter only needed to be backwashed every forty hours. In this perspective, such a filter was chosen as the most economical alternative. If a deterioration of the incoming water were to occur, the authorities have expressed the possibility of considering a solution involving continuous sand filter technology. Compared to Dynasand, the Toveko filter performed better during the last critical period, despite the Toveko filter having a lower bed height.
Toveko Cleaning System offers innovative solutions for water and sewage treatment as well as efficient energy production. Our customized systems handle everything from stormwater to industrial waste water, and we ensure a high degree of purification with advanced technology and carefully designed processes. With over 30 years of experience and leadership in continuous sand filtration, we strive to create a sustainable environment for future generations.
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