Filtration is the process of separating suspended solid matter from a liquid, by causing the latter to pass through the pores of some substance, called a filter. The liquid which has passed through the filter is called the filtrate. The filter may be paper, cloth, cotton-wool, asbestos, slag or glass-wool, unglazed earthenware, sand, or other porous material.
Rotary vacuum drum filter
Rotary vacuum filter drum consists of a drum rotating in a tub of liquid to be filtered. The technique is well suited to slurries, and liquids with a high solid content, which could clog other forms of filter. The liquid to be filtered is sent to the tub below the drum. The drum rotates through the liquid and the vacuum sucks liquid and solids onto the drum pre-coat surface, the liquid portion is “sucked” by the vacuum through the filter media to the internal portion of the drum, and the filtrate pumped away. The solids adhere to the outside of the drum, which then passes a knife, cutting off the solids and a small portion of the filter media to reveal a fresh media surface that will enter the liquid as the drum rotates. The knife advances automatically as the surface is removed.
Horizontal | vertical leaf filter
The pressure leaf filter is an enclosed filtration system and can be fully automated. This filter produces a high filtrate clarity after the clarification run and is also suitable for all kinds of filter aids. The regeneration time between the filtration cycles is short. Horizontal pressure leaf filters can also be delivered as tandem units to save floor space. The pressure leaf filter itself has no rotating parts, keeping maintenance to a minimum. These advantages result in an economical filtration solution. The double-sided filter leaves are made from stainless steel. The rigid filter leaves have five layers of stainless-steel wire screen. The top layer of screen depends on the application. The filter leaves are individually mounted on the central manifold, which allows the removal of any or all of the filter leaves easily and quickly. The filter cake can be dried with compressed air, inert gas or steam. For cake discharge the carriage with the filter leaves is moved outside the filter tank with an electric/hydraulic system, which also operates the bayonet closure. The cake is discharged by a pneumatic vibrator.
Agitated nutsche filter
Agitated Nutsche filter dryer is a closed vessel designed to separate solid and liquid by filtration under pressure or vacuum, due to closed vessel operation product becomes odourless, contamination free, high purity, use of hydraulic system makes equipment of trouble-free operation. Wet cake can be reslurried and washed thoroughly with water or solvents. The discharge of wet cake is automatic, drying of wet cake is also possible when drying features are incorporated. ANFD can be used for different process such crystallisation, filtration, extraction, washing and drying. We can eliminate the chain of conventional machines needed for filtration and thus can save power, labour, space and time. It can be used in chemical, pharmaceutical, agrochemical, fine chemical and food processing industries.
A baghouse, bag filter or fabric filter is an air pollution control device that removes particulates out of air or gas released from commercial processes or combustion for electricity generation. Power plants, steel mills, pharmaceutical producers, food manufacturers, chemical producers and other industrial companies often use baghouses to control emission of air pollutants. The filter materials used are woven or non-woven fabrics made from natural or man-made fibres as well as inorganic fibres (glass, mineral).
Activated carbon and sand filter
Carbon filtering is a method of filtering that uses a bed of activated carbon to remove contaminants and impurities, using chemical adsorption. Each particle, or granule, of carbon provides a large surface area, or pore structure, allowing contaminants the maximum possible exposure to the active sites within the filter media. Activated carbon works via a process called adsorption, whereby pollutant molecules in the fluid to be treated are trapped inside the pore structure of the carbon substrate. Carbon filtering is commonly used for water purification, air filtering and industrial gas processing, for example the removal of siloxanes and hydrogen sulphide from biogas. It is also used in a number of other applications, including respirator masks, the purification of sugarcane and in the recovery of precious metals, especially gold. It is also used in cigarette filters. Active charcoal carbon filters are most effective at removing chlorine, particles such as sediment, volatile organic compounds (VOCs), taste and odour from water.