Filtrasand Continuous Sand Filters

Continuous Sand Filters: description and operation

Continuous sand filters are devices used for the removal of impurities through a mechanical filtration process: therefore, speaking of civil wastewater plants, we are here in a tertiary treatment phase. On the other hand, as far as water management of industrial plants is concerned, this technology is usually installed upstream of other solutions, for adequate finishing to reintroduce the “blue resource” into rivers, lakes or seas.

The filter is equipped with a system that evenly distributes raw feed water to the base of the sandy bed by means of an annular distributor. The water flows through the sand bed from bottom to top and comes out filtered by a weir. At the same time, dirty sand is removed from the filter bed by an air pump, which picks it up from the bottom and lifts it to the top of the filter. Here it is fed into a washing chamber (washer) where the separation of impurities from the sand takes place. In the washer, the sand is cleaned by a flow of raw water against the gravitational motion of the sand itself. The washed sand falls back to the top of the filter bed. The dirty wash water leaves the filter with continuous flow through a separate drain.

Sand filters of this type allow continuous and efficient operation. In fact, dirty sand is continuously removed from the active filter bed by the action of an air pump, which picks it up from the bottom of the filter, lifting it to the washing chamber (washer) located at the top of the filter itself.

Continuous Sand Filters: Applications

Learn about installation contexts here

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