Kappa Tau Filters


Distributors of Disposable Rotary Vacuum Filter Manufactured by Steadfast Equipment


Tinniswood, Rowlands Gill, Tyne and Wear, NE39 1PN, UK

Telephone enquiries +44 (0)1642 653484



E-mail:- filters@kappa-tau.co.uk




Since September 2002 Kappa Tau Filters has been the European and UK distributor of the novel disposable rotary vacuum filter manufactured by Steadfast Equipment of Seattle, Washington, U.S.A.


New Method of Liquid-Solid Separations for Batch Operations


Disposable Rotary Drum Filter

Note the compact size of the filter

In the pharmaceutical, fine chemical, hazardous materials, juice, beverage, beer, and wine industries, most of the production processes are batch in nature. This batch nature is due to the limited volume of the material to be processed, the need for traceable "lots" of material, and/or the high intrinsic value of the product. Processes in these industries frequently require equipment that performs efficient, clean, and reliable solid-liquid separations. Applications in these industries could range from:

  1. Initial clarification of a fermenter
  2. Removal of solids from an intermediate reaction product
  3. Final collection of a product from suspension
  4. Clarification of fruit juices and nectars
  5. Enhancing field testing capabilities

Currently these batch solid-liquid separations are carried out using centrifuges and/or batch filtration equipment like plate and frame or leaf filters. Although these types of traditional equipment have been used for years, they have some inherent disadvantages, especially when applied to laboratory, pilot plant, or other small capacity production applications. This traditional equipment also has disadvantages where time and resources are limited and it is critical that the materials be isolated from the outside environment.

Filter Operation Animation

The diagram shows the slurry being sucked onto the rotating filter drum through the central inlet pipe. As the drum rotates the filtrate is removed on the right and the cake sticks to the filter. A constant thickness of filter cake is maintained by a scraper blade on the left of the diagram and the excess cake is removed and collected at the left hand side.

Features and Advantages of Disposable Filter

Centrifuges can be expensive to purchase, involve high maintenance and a great deal of personnel involvement to operate under aseptic or "clean" conditions. Batch filtration equipment can also be expensive and involves a high degree of operator attendance. Both types of units used in the small production environment may be so radically different than that available for commercial production, that scaleup is costly. In addition, centrifugation and batch filtration present costly manual cleaning operations that require the unit to be opened to the environment. This, in turn, leads to chances of exposure of the material being processed to the outside "uncontrolled" environment, increasing the risks to the final product as well as to operations personnel. Because of this, there is a need for another type of equipment to conduct these solid-liquid separations that addresses some of the short-comings mentioned above.


Table top mounted filter in operation

Filter in use The solution to this problem lies in adapting the primary solid-liquid separation device used in the Chemical Process Industries (CPI) to pharmaceutical, fine chemical, food, beverage, and other low to medium volume applications. This device is the Disposable Rotary Drum Filter . The key importance of this device is that it can be run semi-continuously. Thus a batch of product is run though it for a period of time in a steady state fashion. This semi-continuous operation allows the equipment to be very much smaller than batch equipment that would be used to handle the same amount of material. This reduction in size has some distinct advantages, namely that the device is easily enclosed, enhancing its ability to resist potential contamination of the product or personnel. Also, because of its size the unit can be made of plastic and disposable. Thus the costs and time for cleaning are substantially reduced if not eliminated completely.


Typical Flowsheet Using Filter

The flowsheet shows a typical set up of the filter for a simple solid/liquid separation duty. This operating method is used whether the solids or liquids are the product of interest. Flowsheet



Skid Mounted Unit

Skid mounted unit The compact size of the filter means that the whole unit can be mounted on a skid as shown in the picture. This means that it can be easily moved around to where it is to be used. It is anticipated that a unit similar to that shown on the left can be supplied in the near future. Such a unit will enable customers to minimise the time needed to set up the filter by simply connecting it to a supply of electricity and to the supply of slurry to be filtered. Please contact us for details.

Click Here for details of the materials of construction of the filter and housing

More comprehensive details of the filter and applications are available from Steadfast Equipment

Click Here for details of how quickly the filter can be set up

Click Here to obtain a quotation or to order a filter

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