Agitated Filter is a closed vessel designed to separate solid and liquid by filtration under pressure or vacuum. The closed operation ensures odorless. Filtration and drying are critical operations in a variety of industrial processes that require the ry is unique to agitated nutsche filters. Agitated. Nutsche Filter &. Dryer (ANF/ANFD). NSI. E Q U I P M E N T S . Operation. Agitated Nutsche Filters are extensively used in Chemical,. Herbal.

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The interlock that disables opening the cake discharge valve or opening when the vessel is still under pressure.

The condition of the filter medium, cloth or mesh screen, must be done periodically to ensure that they are not damaged.

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For applications that require preservation of temperature the vessel may be double-walled or half-pipe jacketed to provide effective heat transfer to the product.

In addition two auger arms smoothen the cake by rotating in one direction and convey the cake towards the center for discharge by rotating in the opposite direction.

Handbook of Water and Wastewater Treatment Technologies. The paddle system consists of two arms with slanted blades that rotate in one direction to re-slurry the cake during washing and discharge it at end of cycle. Click on the thumbnail to maximize the image.

The two options of cake discharge may be viewed on the image to the right and both discharge a delumped cake. When this happens the fines seal the cake and slow down the cake formation so keeping the filtdr in suspension with rotating arms during filtration assists in forming a homogeneous cake. Such filters have a filtration area of 15 m2 and are suitable for fast filtering slurries that produce readily 0. Nutsche Filters are operating as part of a batch system hence the vessel’s volume is designed to accept an entire charge of slurry from the upstream equipment.

The operation of Nutsche Filters requires a complex manipulation of valves and hydraulics so present day installations are always semi or fully automated. The filtdr of the filtrate sight glass that enables the inspection of filtrate clarity.

On smaller filters the head and cylinder are in one part that bolts to the filter floor featuring easy access to the filter medium.

The auger nktsche consists of two arms that rotate in one direction to perform re-slurrying as described for the paddle system. These cylinders are provided for vertical movement of the filtre, discharge product and sometimes detach the bottom to clean the filter before changing the product.


A multipurpose agitator is the unique feature of this system.

During resuspension the rotating arms are moving slowly downwards and are “shaving” the bed gradually layer after layer until the entire cake enters the slurry. As such these are very sophisticated machines with tight process control on parameters such as pressure, temperature and pH. To take advantage of the drying ability of the Nutsche Filter it is worth considering the option of heating components such as the vessel, filter floor and paddles to enhance drying. Views Read Edit View history.

This may have a layout impact on the downstream facility such as the conveyor that handles the product to storage. The ends must be cut in an angle to ensure a perfect seal. It consists of an oil tank on which a pump is provided for circulating high-pressure oil through a control valve system and to hydraulic cylinders.

This is done by resuspending the cake with the paddle arms for thorough mixing with agitared wash solution. In this system one of the hydraulic cylinders raises and lowers the paddles depending on the filtration cycle.


Pressure Drying In the drying stage air or gas purges the cake until the captive moisture is reduced to an asymptotic level and in practical terms the cake is considered to be as dry as possible. They are manufactured as agitated Nutsche filter dryers ANFD’S for the filtration and drying in the same unit of active pharmaceutical ingredients API and chemical compounds. One of the advantages of the Nutsche Filter is the ability to smoothen the cake’s surface prior to applying spray wash so that the entire bed is washed evenly.

The large diameter caulking gasket of the dished top head cover. Agiatted selection depends entirely on the characteristics of the solids, the liquid and the appropriate materials of construction.

The vent on top of the head must be checked for free evacuation of agjtated. The filter tank must conform to an Unfired Pressure Vessel code, such as ASME, and checked periodically as required by the safety regulations. On the larger filters the cylindrical vessel is a separate part and the dished head cover is bolted on its top.

Agitated Nutsche Filter – Wikipedia

In the washing stage a spray ring or connections on top of the cover introduce the agitahed liquid over the cake. All these components may be constructed from exotic materials of construction and heated to meet the process requirements.


A typical unit consists of a dished vessel with a perforated plate.

Nutsche Filters are available in almost any size with the larger machines for a slurry filling batch of 25 m3 and a cake volume of 10 m3. This page was last edited on 28 Novemberat In their modern version they were developed in the early 80’s and the majority operates, usually under pressure, in batch oriented industries such as fine chemicals, dyes, pharmaceutics and pesticides. Cake Discharge Once all the stages are completed the cake discharge valve opens and the paddle arms on the smaller machines or the auger arms on the larger ones are rotated and lowered to convey the dry cake towards the center.

The cake may be conveyed for discharge towards a piped chute that is positioned in the center of the vessel or towards an outlet positioned on the vessel’s cylinder just above the filter plate.

Maintenance The Nutsche Filter requires attention on a regular basis to safety devices and automation features that accompany modern filters.

Retrieved from ” https: The Nutsche Filter requires attention on a regular basis to safety devices and automation features that accompany modern filters.

Further reduction in cake moisture may be obtained by slowly rotating and lowering the paddle arms to scrape and delump the cake. Washing efficiency may be further improved if air or gas are not allowed to enter the cake in a multi-washing system so the wash liquids always displace the solutions in a “piston” like manner.

Present day Nutsche Filters are constructed to perform a multitude of tasks including reaction, filtration, cake washing and thermal drying on a single unit. This seals cracks in the cake so that air or gas will not bypass the bed. There are two types of vessels: Medium selection cannot be determined on a bench scale leaf test and it is only pilot testing that can establish long term effects such as medium blinding and fluctuations in the feed properties.

The pressure relief valve that is located on the top of the dished head must be checked for emergency functioning. This arrangement has usually swing type fast locking bolts which are attached to the circumference of the filter floor.