There is an increasing demand for automatic filter systems for process media recycling and product filtration which is also capable of treating finest, difficult-to-filter particles in the range from 1 to 10 µm. The BDS micro-filter system is especially tailored to these challenging applications in the field of industrial filtration and additionally reduces operating costs.
The BDS system works with a stainless steel depth filter, which facilitates high flow rates and a long filter service life. No filter aids are necessary, thanks to the self-regenerating function. The BDF thus represents an alternative to systems that work with bag or cartridge filters. The disposable filter elements, which are often employed for problematic media, do not need to be exchanged or disposed of at considerable expense. This cuts operating costs and additionally protects the environment.
The BDS filter is cleaned fully automatically. The low costs of operation and maintenance and the closed system, which protects the user against contact with the media, are further arguments in its favour. The relevant applications in the process industry are highly specific. This is also confirmed by tests conducted with the BDS micro-filter. Nevertheless, the problems are similar to those presented by numerous other applications. Two examples are described below.
Interim filtration of chemical products
In the first application, inorganic salt solutions have to be freed from particles in order to offer customers a clear product. The impurities are introduced into the process by the initial material. The filter plant is confronted with high flow rates and a relatively low solids content. The existing installation needs to be replaced, because very high flow rates and continuous operation are technical requirements which the system is currently unable to fulfil. Some of the systems available on the market work with filter aids like diatomaceous earth. Due to new classifications, however, these filter aids must be avoided. Thanks to its self-regenerating depth filter, which allows it to work without filter aids, the BDS micro-filter is ideal for this application.
The filter system prevents the passage of particles into downstream processes during interim product filtration of an alkaline, chloride and metal ion-bearing medium. More important in this process, however, is protecting employees against contact with the medium. The key requirements to be satisfied by the micro-filter are consequently a high quality standard, resis-tance to materials and functions and a closed system which precludes all contact between human beings and the process medium. Disposable filter elements are only of limited suitability here, because they block quickly and have to be changed manually.
Treatment of process water
High flow rates occur during the recycling of wash water, which is contaminated with very fine catalyst dust and which originates from a gas washer. In this application the filter fineness is approximately 3 µm. After the liquid samples have been prepared with the BDS filter, the wash water can be returned to the cycle. A continuously operating system is important here in view of the high flow rates.
The system functions as a so-called police filter during the treatment of process water downstream of a chamber filter press. The production of circuit plates demands ultra-pure water of an extremely high quality, which is returned to the system after recycling. The system has to filter ultra-fine particles down to 1 µm with high-quality solutions.
BDS test plant
The range of applications in the process industry is vast and the examples described here can only provide a brief overview. To meet individual requirements, Faudi conducts trials on a test plant specially built for the BDS micro-filter at its own research and development centre in Stadtallendorf. For trials under realistic conditions a compact test plant is additionally available on the customer’s site.
cpp 434
Share:
