|Payment Terms:||L/C,T/T,Western Union|
|Supply Ability:||50 Piece/Pieces per Month|
|Installation:||Water Inlet Main Pipe|
|Place of Origin:||Jiangsu China|
|material for filter tank:||carbon steel,SS304,SS316L,FRP|
|Use:||remove samll solid particals in water|
|ambient temperature:||5--50 centigrade|
|Feature:||Make High Concentration Hydrogen Water|
|connection at water inlet:||GB,ANSI,JIF flange,|
|working pressure:||0.6--1.6 Mpa|
|Packaging Detail:||plywood case into container|
Slow sand filtration is a type of centralised or semi-centralised water purification system. A well-designed and properly maintained slow sand filter (SSF) effectively removes turbidity and pathogenic organisms through various biological, physical and chemical processes in a single treatmentstep. Only under the prevalence of a significantly high degree of turbidity or algae-contamination, pre-treatment measures (e.g. sedimentation) become necessary. Slow sand filtration systems are characterised by a high reliability and rather low lifecycle costs. Moreover, neither construction nor operation and maintenance require more than basic skills. Hence, slow sand filtration is a promising filtration method for small to medium-sized, rural communities with a fairly good quality of the initial surface watersource. As stated by the WHO, slow sand filtration provides a simple but highly effective and considerably cheap tool that can contribute to asustainable water management system.
Sand filters are the oldest and most basic form of water filtration and originally consisted of large volumes of sand through which water simply percolated. Modern systems however now include various media layers which allows much more efficient filtration in smaller vessels.
Multi-media sand filters normally consist of three media layers (ie. support base gravel, micro screened sand and anthracite) and are a very economical means of primary filtration to remove the bulk of suspended solids. They are particularly efficient on surface waters for the removal of grit, sediment, turbidity and organic matter but also widely used on oxidised iron ('rust') and other precipitated contaminants such as manganese or scale particles.
Multi-media filters are periodically backwashed (either automatically or manually) by simply reversing the flow and this flushes to waste the accumulated sediment and also regrades the filter media layers.
Backwashing Sediment Sand Filters
How often should sediment filters be backwashed?
On the question of how often a backwashing sediment filter should be backwashed, there is no concrete answer. The common way is simply to guess. If you're guessing, err on the side of too much rather than too little, because excessive sediment buildup can sometimes be irreversible.
The best way to make the when-to-backwash decision is to install pressure gauges before and after the filter. Be sure to backwash before a critical pressure drop is reached.
According to Joseph Harrison (Water Technology, Nov. 2005): "At pressure drop increases of 15 or more psid, the captured suspended solids can begin to form a more compacted filter cake, which may become difficult to break up and remove during backwashing."
Technical parameters sheet for Mechanical sand carbon filter