This is pressure filter in line as shown in the picture is generally known as Micro Filtration or cartridge Filter is a low-pressure cross-flow covering process for separating colloidal and suspended particles in the range of 0.05-10 microns by separating larger size solutes from aqueous solutions by means of a semi-porous covering. This process is carried out by having a process solution flow along a membrane surface under pressure. Micro Filtration is used for fermentation potage clarification as well as biomass clarification and recovery.
Micro Filtration helps in
· Retaining large suspended solids.
· Passes some suspended solids and all dissolved material.
· Pore ranges from 0.05 micron to 10 microns.
If the flow rate is more, we need to give number of cartridges in one housing as shown here.
TYPE OF cartridges :
Depending on filter medium we can classify the filter cartridges as depth or surface filter. Also they are available in various materials like, Polypropylene, Cotton, Cellulose, Glass-fibre, Nylon, PTFE, PES, Ceramic, S.S. Screen, Sintered S.S. or Bronze etc.
SURFACE FILTER :
 Filter media where the pores are within the same 'Plane' i.e. Screen or Surface filter as shown in the picture here.
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STANDARD cartridgeS :
Generally cartridges are avaliable as per international standard in 10", 20", 30" and 40" length cylinders. O.D. of the cartridge is approx 70mm and I.D. is 25 mm. They are available in different end connections like Double Open End - "RF Style, Double Open end with Gasket, Code -7 type, Code -9 type etc.... Generally cartridges can classified as pleated or depth type.
PLEATED Cartridge
In pleated cartridges, actual filter medium is in pleated from to cover more surface area. It is pleated on perforated core. It is supported with any other medium, which is coarser to give minimum pressure drop and good strength to the cartridge. Outer cage is provided to give mechanical strength to the cartridge.
Pleated cartridges are developed to meet the process needs and throughout requirements of the pharmaceuticals, food and beverage, electronics, chemical, and other critical industries. This high performance assortment of filter cartridges is constructed of pleated polyester support of cartridges.
Pleated polypropylene medium cartridges have been manufactured with high efficiency, low pressure drops, and have high holding capacity and long life. All cartridge hardware components are high purity polypropylene.
Paper, S.S. wire-mesh, polypropylene, Nylon - N66, Polyethersulfone, Multi cartridge Filter Unit, Special Purpose Filter, Conical Filter, D.M. Water Filter Element, Fluropolymer, Glassfibre or PTFE material pleated filter cartridges are widely available.
DEPTH CATRIDGES :
 Polypropylene, Cotton, Nylone, Cellulose, Ceramic,Sintered S.S. & Sintered Bronze media are available in depth type cartridges. Many manufacturers make graded pore structure depth media, which gives efficient filtration because of proper pore distribution. (Cross section of Depth cartridge)
Techno-Filt International polypropylene Depth Filter cartridge is an innovative product. Sequential layers of graded density-medium provides for Depth cartridges loading of impurities through the entire cartridge, rather than just on the surface.
This capture area is further extended by pleating the media. In addition, cartridge Filter media provides exceptionally fine preservation while maintaining high flow rates at low differential pressures. It provides an economical operating cost while providing a high-quality output.
Depth Filter is very clean and will not contribute wreckage to the filtrate. The manufacturing process prevents contamination of the process fluid by the media itself, a condition known as media migration.The Depth Filter cartridge is made entirely of polypropylene, it is chemically compatible with a wide variety of chemicals.
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