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.

Summary of 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.

These filters can also be designed as Ammonia Removal filters, denitrifying filters and/or phosphorous filters.

All wetted parts are in stainless steel AISI 304L. Special construction materials available upon request.

Solutions for installation in a concrete basin of several basic filter inserts is available, as is that for single concrete filters of various sizes.

Contact Us Request a Quote