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Use of anthracite in water treatment and purification

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Filter media are materials that allow the passage of raw water through them and retain the particulate matter. Filter media are selected based on desired physical characteristics, such as specific size, gravity and particle sizes.


It is a high-hardness mineral coal of great carbon content. It is formed, like all mineral coals, by a slow process (millions of years) of plant transformation by effect of pressure and temperature. It is the last one on the scale of the Cobonus, and the one that more temperature and pressure needs to form. It is black and shiny, the most dense and hard of the carbons, with a high carbon content (more than 95%).
Anthracite is an excellent filter media for water clarification in drinking or industrial use, when used in combination with filtering sands. It is one of the most used filtering media. It is a good complement for the mixed filters, in company of sand or green manganese sand. Due to the special shape of its grains, it allows the suspended particles to be retained in the depth of the filtering bed. Compared to a sand filter, this filtering medium allows a higher flow, less pressure drop and a better and faster backwash.

Anthracite filter materials are specifically selected from deep mines with the highest percentage of carbon.


Filtration through multilayer beds is a technique widely used in the elimination of suspended particles the raw water, having its main applications in the wastewater purification stations, desalination and drinking water treatment.

Filtration can be done through a single filter bed or several overlapping. In the multilayer beds, normally, the less dense filtering media such as anthracite are placed on the upper part, pretending that the solids are kept in this area of the bed. After the first layer of the finest material, such as sand, it follows another layer of coarser sand, a layer of fine gravel and finally a thick gravel layer as a support. Anthracite is characterized by producing reliable improvements in turbidity extraction, mainly thanks to its greater capacity to retain solids.

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