》Min. pressure: 0.15Mpa
The Filtering Process
Filtering with media filters, also known as depth filtration, is done by filtering water through a thick layer of graded particles, called the filter bed. These particles can be sand, gravel or other granular materials. The filtration degree depends on the effective size of the bedding and the water velocity through the filter.
Raw water enters from the filter inlet (1) and percolates through the filter bed (2). Suspended materials come into contact and attach to the media particles. Clean water flows through the filtration nozzles (3) and out of the filter via the outlet valve (4).
The gradual dirt buildup in the filter bed causes an increase in the pressure differential across the filter and when it reaches its maximum design value, a cleaning process should be performed. In automatic media filter installations a pressure differential switch senses the pressure differential and when it reaches a preset value, the self cleaning process begins.
The Cleaning Process
Cleaning is done by backwashing; pressurized water flows in reverse direction – from the nozzles upwards, causing suspension of the filter bed, thus releasing the suspended matter from the bedding. The dirt particles are then washed out of the filter through the back-flush valve. In automatic media filters installations the cleaning process is done by the system's controller. When the pressure differential switch senses that the differential pressure across the system reached a pre-set value, a signal is sent to the flushing controller and the self cleaning process begins.
The Control System
CDFS supplies several control systems for its sand filters such as Electrical Control Boards, Programmable Logic Controllers (PLCs) for supporting any size of media filters installation.
Multi vessels sand filter system firgure
Sand filter specification sheet table
|Min. pressure||Max. pressure||Backwashing|
|DMF24-2-A||2||30||22||0.2||1.0||15||80 / 3|
|DMF24-3-A||3||45||33||0.2||1.0||19||80 / 3|
|DMF28-2-A||2||60||30||0.2||1.0||30||100 / 4|
|DMF28-3-A||3||90||45||0.2||1.0||50||100 / 4|
|DMF32-2-A||2||75||40||0.2||1.0||35||100 / 4|
|DMF32-3-A||3||115||60||0.2||1.0||50||150 / 6|
|DMF36-2-A||2||80||70||0.2||1.0||40||100 / 4|
|DMF36-3-A||3||120||105||0.2||1.0||50||150 / 6|
|DMF48-2-A||2||160||100||0.2||1.0||80||150 / 6|
|DMF48-3-A||3||240||150||0.2||1.0||80||200 / 8|
Remark: 1. Agri - agricultral irigation, indus. -industrial.
2. The flow is different when used for irrigation and industrial
Sand filter and self cleaning filter for irrigation
Multi vessels auto sand filter dimensions
Remark: The agri.- agricultral, The indus- industrial.
The flow is different when used for agricultral and industrial
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