TOVEKO Sand Filters

Published on by for Aquarion Group

TOVEKO Sand Filters

TOVEKO Sand Filters

TOVEKO sand filters are gravity-fed units that operate continuously so long as there is a flow that requires filtration. This and other elements of their design offer some significant advantages.

No Standby Filter Required

The solids removed from the incoming flow are then cleaned from the sand bed at the same time as the filter is operating. This means that it does not need to be taken “off-line” for backwashing like a conventional sand filter, which therefore means that you do not need a standby filter and all the large tanks, pumps etc. that is required for backwashing.


TOVEKO Filters Are Only 2.3m High

This means that they fit into a normal height room, making frost protection and installation in “visually sensitive” sites very straightforward. It also commonly allows gravity flow into the filter from the preceding treatment step (for example settlement), avoiding both the need for an expensive pumping stage, and also ensuring that the delicate solids are not broken-up within the pump. This therefore makes their subsequent removal in the filter more easy and efficient and so gives you better quality filtered water.


Unique Sand Washer

The rotation of the unique sand washer in TOVEKO filters means that the sand grains “roll” over each other. The gently abrasive “rubbing” improves the sand cleaning process, efficiently removing whatever is on the sand surface.

This difference is really important where the solids removed are at all sticky (for example where polyelectrolyte is used for flocculation) or indeed where there is oil present in the water. Actually, TOVEKO filters are used quite commonly for the removal of oil in wastewater. Of course, any sand filter will remove oil, but TOVEKO is unique in its ability to remove it from the sand again so that the filter continues to operate efficiently.


Automatic Monitoring

Any continuous gravity sand filter relies on a “head” of wastewater above the sand bed to “push” the water through the sand. Uniquely, TOVEKO filters constantly monitor this so-called head loss and this enables automatic control of filter operation.


Stainless Steel Construction

TOVEKO filters are normally constructed in 304 grade stainless steel (1.4301). For higher chloride concentrations, 316 grade is used (1.4401). For even higher concentrations (for example seawater), duplex alloys are available.

 

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