Fiber ball Filter/Multimedia Filter Tank for Water Treatment

Miltimedia filter is a kinf of using quartz sand(quartz sand and anthracite or activated carbon,fiber ball,FRP-fiber reinforce plastic etc.) as the filter medium of the filter. It is to use one or several of filter medium,under certain pressure, make concentrate through the medium, to remove impurities,so as to achieve the purpose of the filter.

Different Technology: gravity or pressure.

Electronic control system: automatic or manual

Fiber ball Filter is the most common method of treatment for dechlorination and removal of colour, odor, Organic impurities & Residual chlorine from water, through adsorption of the compounds that cause these problems.

Fiber ball Filter operates through adsorption. Adsorption is directly related to the surface area of the media. This great surface furnishes a huge adsorption area for organic as well as chlorine molecules to attach themselves. This intermolecular attraction between the carbon surface and the substance that is being adsorbed can be altered by increasing the density of the carbon or by reducing the distance between the carbon surface and the substance being adsorbed.

Applications

The Multigrade sand filter is an ideal choice for all applications where a conventional sand filter is used.
• It is extensively used in side stream filtration of cooling water.
• Drinking Water.
• It is ideal for filtration of clarified water.
• Water used in chemical processes.
• Filtration process in Industries.
• Used for pre – treatment for membrane systems.
• Swimming Pool Water Filtration.
• Filtration in Tertiary waste water treatment.
• Pharmaceutical Production processes

Characteristic

PRESSURE SAND FILTER PROCESS

Raw water is passed through the pressure sand filter, the filter media is supported on gravel bed that consists of multiple layers of Graded quartz sand, Fine sand, Super fine white sand and pebbles of progressively larger sizes. During the filtration cycle the filter bed retains the dirt and suspended particles from the water and accumulates within the filter the water and accumulates within the filter bed. As the filtration progress the filter media gets loaded with retained suspended particles, this results in a continuous increase of pressure drop across the filter, when a predetermined pressure drop level is achieved the filter is shut down for cleaning.

BACK WASH

As the filtration progress the filter media gets loaded with the retain the suspended particles, this results in a continuous increase of pressure drop across the filter, when a predetermined pressure drop level is achieved the filter is shut down for cleaning. The filter media is cleaned by backwash system. After backwashing the filter is rinsed with raw water and after the required quality of water is achieved the filter is put back into service. Depending on the filtered water quality required backwashing is either done with raw water or with filtered water..

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.

Working Principle of multimedia filter

Machine filtering is to use one or several filter medium, under the pressure of certain, make through the medium, bioburden remove impurities, get filtrate, so as to achieve the purpose of filter. Inside pack packing is commonly: quartz sand, anthracite, particle porous ceramics, manganese sand etc, user can choose according to the actual situation of use.

Working Processes with the sand filter/carbon filter /multi-media filte for water pre-treatment

RO/UFWorking Processes :(Raw Water Tank)→Raw water pump→ Sand filter→Carbon filter→Water softener→Cartridge filter→High-pressure pump→ RO/UF→Pure water tank

EDI Working Processes :(Raw Water Tank)→Raw water pump→ Sand filter→Carbon filter→Water softener→Cartridge filter→High-pressure pump→ RO→EDI→Pure water tank.