What is a Sand Polishing Filter?
In Ireland, sand polishing filters are sometimes used in tertiary treatment to purify the water enough that it can be returned to the environment safely. A typical sand filter is made with alternating layers of varying grades of sand each about 900 mm in thickness.
In a typical sand polishing filter layout, three layers of sand, made up of an upper layer of coarse sand and intermediate layer and lower layer of fine sand, each separated from each other by a thin layer of washed pea-sized gravel or other broken stone.
The hydraulic loading should not exceed 60 l/m2/day. The sand-polishing filter can be covered with soil and sown with grass. The range of sand types and the filter specifications suitable for the polishing filter are available from EPA Ireland.
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