Sand Filters    for Trade Waste The Environmental Warehouse home page
	Description
	The Granular Media Filter is a deep bed of filter coal and sand which provides a graded media porosity to enable high levels of solids capture including both micron size and larger mm sized flocs. The graded media allows deep solids penetration without rapid surface clogging thereby tolerating variable settling tank performance. As solids are captured in the filter, back pressure rises steadily. At a predetermined set point the filter is back washed to restore the porosity of the filter media. The Granular Media Filter will typically reduce suspended solids levels to less than 20 mg/L. Filters are available in simplex or duplex form to suit both low or high flow rates.
	Gravity filter used in trade  wastewater recycling system at electroplating factory.
	Benefits
	Improves discharge water clarity & quality  Reduces suspended solids  Reduces heavy metal content in discharge water (insoluble metals)  Provides consistent final water quality  Minimizes risk of solids overflow to sewer from clarifiers and settling pits  Low operating cost  Activated carbon media available for colour & organics removal
	Applications
	Granular Media Filters are generally applied to mixed wastewaters after pre-treatment such as flocculation and settling. Alternatively, the filter may be applied to specific processes to either purify or recover water. Granular Media Filtration is suitable for most waste systems where solids are to be removed.
	Applications include ...
	Plating & anodizing rinse waters  Machine coolant wastewater  Parts washer rinse water  Paint spray booth wastewater  Food processing wastewater  Vehicle wash down water  Spray washers  Steam cleaner wastewater  Dam water  Water-based inks  Textile wastewater
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