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Filtration is used in combination with coagulation for the removal of particulates. This prepares the water for use as potable, boiler, or cooling make-up.

In most water clarification or softening processes where coagulation and precipitation occur, at least a portion of the clarified water is filtered. Clarifier effluents of 2-10 NTU may be improved to 0.1-1.0 NTU by conventional sand filtration, with mixed media and zeolite filters offering effective filtration down to as little as 5 micron.

A mixed media filter refers to a type of filter bed which is graded by size and density. Coarse, less dense particles are at the top of the filter bed, with finer, more dense particles nearer to the bottom. Down-flow filtration allows deep, uniform penetration of particulate matter into the media bed and permits high filtration rates and long service runs. The smaller less dense particles tend to remain at the bottom of the filter even after high-rate backwashing.  Thus, the different media layers remain intact in the mixed media filter bed.

A2V are suppliers of high grade filtration media:

TYPE SIZE RANGE (mm) UC (D60/D10)
Garnet 0.3-0.5 <1.4
Fine Filter   Sand 0.3, 0.5, 0.7 <1.5
Coarse Filter   Sand 0.8, 1.1, 1.3 <1.5
Anthracite 1.0-2.1 <1.6
Zeolite                                                      0.8-1.4  <1.5

 

Please contact us for further information