Dynamic Sand Filters


Colloide‘s Dynamic Sand Filter offers an excellent treatment system for the removal of solids and other contaminants from a water/wastewater stream. This filter is always on line, continually filtering the incoming water while continually backwashing a small portion of the sand bed. The Dynamic Sand Filter process: The feed water is fed into the filter at the base of the active sand bed through the distribution ring. It then flows upward through the downward moving sand bed where the solids are filtered out. The clean filtrate exits the filter through the overflow weir. The continuous reject flow of washing water is discharged through a separate outlet. The dirty sand is continuously removed from the active sand bed thanks to the action of the air-lift pump. This pump draws the contaminated sand from the bottom 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.

Water extraction - systems and equipment
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