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It is an automatic,self-cleaning microscreen filter designed for removal of suspended solids.Filtration opening sizes range from 10 microns to several hundreds of microns.Construction materials are chosen depending on water quality,with stainless steel,acid-proof steel,duplex steel,and FRP among the most common choices.The filter material can be constructed of either polyester or stainless steel.
How It Works
Water to be filtered is guided into the drum and flows by gravity through the filter media panels mounted on the periphery of the drum.Suspended solids are separated and accumulated on the inside of the filter media.
When the water level inside the filter drum increases to a preset point,the drum starts rotating and the backwash of the filter media starts.The high-pressure backwash spray removes the accumulated suspended solids into the reject flume inside the filter.Within a preset range,the drum rotates with optimal speed and optimal backwash water pressure to clean the filter panels using the filtrate water.The wash water is collected in the reject trough and is transported out through the reject pipe.The filter media is submerged to a maximum of 65% and the water level of the filtrate is kept by an effluent weir.
It features very low head loss,low energy cost,and a reliable,tested design.
Our continuous Rotary Vacuum Drum Filters provide a wide range of liquid-solids separation for many types of industrial processing flow sheets.They offer the operating flexibility to handle dewatering,washing and clarification applications,or a combination of the two.Our drum filters are available with drums up to 13.5ft in diameter and 36ft in length and are built to customer specifications.
Rotary Vacuum Drum Filter Designs Include:
Scraper Discharge is the most common drum filter discharge.After dewatering,the cake is removed from the filter cloth by a scraper blade just prior to the re-submergence of the drum.The scraper serves mainly as a deflector to direct the cake,dislodged by an air blowback,into the discharge chute.
Precoat Discharge is best applied to processes which have relatively low concentrations of solids or produce filter cakes which effectively blind the filter media.
Roll Discharge is especially good for thin,sticky cakes which have the unique property of sticking to themselves.The filter cake on the drum is pressed against a discharge roll packed with filter cake so that the thin cake is pulled or peeled from the drum.Solids are removed from the discharge roll with a knife blade.
String Discharge best applies to thin cakes and materials that are unstable and if disturbed too much will change from a solid to a liquid.Most generally applied in the starch and pharmaceutical industries,it is a system of endless strings or wires spaced about 0.5inches apart that pass around the filter drum but are separated tangentially from the drum at the point of cake discharge.The strings return to the drum surface guided by two rollers with the cake separating from the strings as they pass over the rollers.
Belt Discharge offers the ability to discharge filter cakes and wash both sides of the filter cloth with each drum rotation.The Belt Discharge Drum Filters offer the ability to discharge filter cakes and wash the filter media with each drum rotation.Many applications using this type of filter produce thin,sticky and wet filter cakes which are not easily discharged without the aid of a discharge roll.
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Main Product:
Sewage Treatment Equipment,
rotary drum filter,
dissolved air flotation,
lamella clarifier ,
Band Screen,
sludge dewatering
