Enviro Process Engineering (HK) Co. Ltd.
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CONTINUOUS SAND FILTERS:new and improved technology for the cleaning of sand filters. Continuous sand filters require no downtime for backwashing and have an absence of mechanical moving parts.
An innovative system of continuous sand filtration
Principle of Operation:
The dirty sand is continuously removed from the active sand bed (A) thanks to the action of the air-lift pump (C), which sucks the contaminated sand from the bottom (B) of the filter body. A mixture of sand, dirty particles and water is transported upward through the air-lift pipe into the washing chamber at the top of the filter.
The separation of impurities from the sand takes place in the exclusive washing system. This is accomplished through the simultaneous action of both counter current water and air injected at the bottom of the washing chamber. The sand is returned by gravity to the top of the active sand bed (A) after being routed downward through a labyrinth of several settling steps.
The feed water is fed into the filter at the base of the active sand bed through the distribution ring (D). It then flows upward through the downward moving sand bed where the solids are intercepted. The clean filtrate exists the filter through the overflow weir (E). The continuous reject flow of washing water is discharged through a separate outlet.
Material in Stainless steel or other special constructions on request
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