Industrial multi-media water filter systems water pre-treatment
multi-media water filter systems are ideally suited for use where stringent water quality standards are required or where higher levels of suspended solids are present. These applications can include re-use applications, water pre-treatment applications for reverse osmosis and deionization systems or as a pre-treatment system prior to a disposable bag or cartridge filters.
Advantages:
The multi-media water filter systems operate for much longer periods of time (five or more times as long at the same filtration rate) before backwashing is necessary because the bed can hold more turbidity. Turbidity is trapped and held throughout the entire bed depth, rather than the top one or two inches.
Multi-media filtration is much better suited for use in a closed pressure tank since cracking of the bed, and subsequent breakthrough of turbidity is virtually eliminated and the need for visual inspection is unnecessary. The use of pressure tanks (rather than open basins or filters) is an obvious advantage for point-of-use filtration and could also be of real importance in the filtration of small community water supplies. More rapid filtration flow rates in multi-media filtration allow the use of smaller diameter tanks with equal or better results. A very high degree of clarity is achieved in the filtered water because of the fact that the finer particles of garnet at the bottom trap finer turbidity particles.
Another important advantage is that multi-media water filters can clarify water at a much higher flow rate than a single-media sand filter (5.5 to 8 gallons per minute, as compared to 1.5 to 2.5 gallons per minute in a 12 inch diameter tank). This is 14 to 15 gpm per square foot of bed area, as compared to 2 gpm per square foot of bed area. This is a very important difference in the production of filtered water.
Applications:
Pre-filtration of disinfection equipment
Preparation for micro and ultrafiltration
Swimming pool filtration
Groundwater purification
Separation processes in which flocculants are used
Water treatment plants
Suitable for various filter media (active carbon, neutralisation media)
Working Principle
Also refers to multi-layer filter, a typical multimedia filter contains three layers of filter media (anthracite coal, sand and garnet). The principle behind using these three types of filtration media is the difference between particle size and density properties of these materials. Anthracite media is the lightest and largest particle size media, which remains of top following backwash while the intermediate size media (sand) will settle in the middle and garnet, the heaviest but having the smallest particle diameter, will settle to the bottom. Periodically backwashed is mandatory to remove contaminants trapped in the media during filtration process.
This kind of arrangement allows the largest dirt particles to be removed at the top media bed and the smaller and smaller dirt particles being retained deeper and deeper in the media. This down-flow filtration permits delivery of high quality filtered water at much faster flow rates; typically particle removal approximately 5 to 25 microns.
Technical Parameters:
Specifications:
Model |
TANK SIZE
(mm) |
TOTAL HIGH
(mm) |
FLOW RATE
(m3/hr) |
INLET AND OUTLET
(mm) |
YLD-MF-500 |
500*1500 |
2350 |
~2 |
DN32 |
YLD-MF-600 |
600*1500 |
2380 |
2-3 |
DN32 |
YLD-MF-700 |
700*1500 |
2400 |
~4 |
DN40 |
YLD-MF-800 |
800*1500 |
2400 |
~5 |
DN40 |
YLD-MF-900 |
900*1500 |
2500 |
~6 |
DN50 |
YLD-MF-1000 |
1000*1500 |
2600 |
~8 |
DN50 |
YLD-MF-1200 |
1200*1500 |
2700 |
~11 |
DN65 |
YLD-MF-1400 |
1400*1500 |
2800 |
~15 |
DN65 |
YLD-MF-1500 |
1500*1500 |
2850 |
~18 |
DN65 |
YLD-MF-1600 |
1600*1500 |
2900 |
~20 |
DN80 |
YLD-MF-1800 |
1800*1500
1800*1800 |
3000 |
~25 |
DN80 |
YLD-MF-2000 |
2000*1500 |
3100 |
~30 |
DN100 |
YLD-MF-2200 |
2200*1500 |
3180 |
~38 |
DN100 |
YLD-MF-2400 |
2400*1500 |
3330 |
~45 |
DN100 |
YLD-MF-2500 |
2500*1500 |
3380 |
~50 |
DN100 |
YLD-MF-2600 |
2600*1500 |
3430 |
~55 |
DN125 |
YLD-MF-2800 |
2800*1500 |
3530 |
~60 |
DN125 |
YLD-MF-3000 |
3000*1500 |
3630 |
70-80 |
DN125 |
YLD-MF-3200 |
3200*1500 |
3730 |
80~100 |
DN150 |
FAQ:
01. how small a solid needs to be removed,
02. how dirty the water is,
03. how the water will be used once it is filtered,
04. and the source of backwash water needed to clean the filters.