Hyperbar vacuum filtration

The so-called hyperbar vacuum filtration is a combination of vacuum and pressure filtration in a pull—push arrangement, whereby a vacuum pump of a fan generates vacuum downstream of the filter medium, while a compressor maintains higher-than-atmospheric pressure upstream. If, for example, the vacuum produced is 80 kPa, ie, absolute pressure of 20 kPa, and the absolute pressure before the filter is 150 kPa, the total pressure drop of 130 kPa is created across the filter medium. This is a new idea in principle but in practice requires three primary movers a Hquid pump to pump in the suspension, a vacuum pump to produce the vacuum, and a compressor to supply the compressed air. The cost of having to provide, install, and maintain one additional primary mover has deterred the development of hyperbar vacuum filtration only Andrit2 in Austria offers a system commercially. 

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One such concept is the so-called hyperbar vacuum filtration. This is a combination of vacuum and pressure filtration in a pull-push arrangement, whereby a vacuum pump or a fan generates a vacuum downstream of the filter medium, whilst a compressor maintains higher-than-atmospheric pressure... 

Apart from the hyperbar vacuum filtration, the work at Karlsruhe also includes fundamental investigations into cake filtration generally, pressure filtration of coal and ore suspensions, and studies of dewatering of cakes. As an alternative to the small drum filter, they have apparently also used a small belt filter in the same pressure vessel. Some commercial developments, like the KHD pressure filter, are reported to have originated from the work at Karlsruhe. 

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