Agitated Nutsche filter (ANF) is a filtration technique used in applications such as dye, paint, and pharmaceutical production[1] and waste water treatment.[2] Safety requirements and environmental concerns due to solvents evaporation led to development of this type of filter wherein filtration under vacuum or pressure can be carried out in closed vessels and solids can be discharged straightaway into drier.
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A typical unit consists of a dished vessel with a perforated plate. The entire vessel can be kept at desired temperature by using a limpet jacket, jacketed bottom dish & stirrer (blade & shaft) through which heat transfer media can flow. The vessel can be made completely leak proof for vacuum or pressure service.
A multipurpose agitator is the unique feature of this system. The agitator performs a number of operations through movement in axes both parallel and perpendicular to the shaft.
A power pack is a unit attached to the ANF’s agitator system. It consists of an oil tank on which a pump is provided for circulating high pressure oil through control valve system and to hydraulic cylinders. These cylinders are provided for vertical movement of the agitator. Operating pressure of oil varies from 2 kg/cm² to 80 kg/cm² (200 kPa to 8 MPa).
Agitated Nutsche filters can be fabricated in materials like Hastelloy C-276, C-22, stainless steel, mild steel, and mild steel with rubber lining as per service requirements. Recently agitated Nutsche filters have been fabricated out of polypropylene fibre reinforced plastic (PPFRP).