Disc Filter Usage Overview

A disc filter is a flat filter that comprises a thin filter membrane stretched over a circular rim

. This filter type is used for separating solids from a liquid. These filters are available in various disc diameters ranging from as less as 5 to 33. It is possible to purchase such filters with various filter media materials. These would include pure polypropylene, polyester, DE impregnated cellulose paper, or absolute PVDF micro-fiber.

The best part about these filters is their flat, compact size. Despite their compact nature, they have a very high surface area enabling a more effective filtration process.

Industries and applications

One of the oldest uses of these filters have been in the mining and metallurgical sector where they have been applied in operations such as de-watering of iron ore taconite and coal. Even today, these filters are extensively used in the metallurgical sector. Such a filter usually comprises several discs placed in succession so as to trap impurities as the liquid or slurry flows from one disc to another. As the solids accumulate on the filter surface, they form a cake that can be removed.

The filter can then be cleaned and re-used. While some industries make use of a clean water spray to rid the filter of impurities, others use filters models with back-flush.

Another very common use of the disc type filter is in purifying waste water. They are also used in recirculation applications where a fluid needs to be repeatedly purified. Other metal finishing and treatment applications also make use of a disc filter. These could include powder carbon treatment, waste effluent polishing, metal treatment, and even electroplating solutions.

The screen on these filters is what helps to trap the impurities. Thus, the micron rating of the screen is absolutely paramount in keeping with your application.

Choosing the right disc filter

Your application determines the exact nature of the filter that you choose. For instance, if you have a heavy duty slurry application you might need to use several large-diameter filters. The degree of filtration desired also has a bearing on your filter selection. Another important aspect that you would need to consider is the flow capacity. If you have large-volume filtration needs, a large disc filter would be required.

While most filters are suitable for trapping both organic and inorganic contaminants, it might be a good idea to consult with your filter manufacturer for the best solution. Sometimes, disc filters are used in conjunction with other filter media. While some applications call for the use of horizontal disc filter media, others need vertically stacked discs.

There are certain manufacturers that specialize in standard as well as custom disc filter media. They can be considered to be a reliable source for procuring the most suitable filters for your filtration needs.

by: Angela Smith

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