Advantages of Anthracite Filter Media
Anthracite Filter Media are filtration materials for turbidity and suspended solids (SS) removal. Since the specific gravity is lighter than that of Filter Sand, it is much used in combination with filter Sand in dual-Media filtration, to consist reverse grain layers after backwashing. In addition, because of high content carbon of this product, it has high resistance to various chemicals and high physicals strength so that it is widely used for city and industrial water purification.
1. High void percentage and much removal capacity of turbidity and SS
In the “Single-medium Filtration” treated by Filter Sand only, small particles are placed at upper part of layer, called as “surface Filtration” that turbidity and SS are caught at surface part mainly, and it result in less removal capacity of turbidity and SS. By use of Anthracite Filter Media of which the specific gravity is lighter than that of the filter sand and even bigger particles can be placed on the Filter Sand, it is possible to enlarge the removal capacity of turbidity and SS as ideal “Dual-media Filtration” in combination with Filter Sand and it is widely used in many water works in Japan. Since Anthracite Filter Media, Being rich angular and complicated in form, have high void percentage and large specific area, “Deep Bed Filtration” which is effective not only at the surface but also in the depth can be realize and it is also used with single and deep layer.
From these features, the filtration will be effective by use of Anthracite Filter Media as follows :
- Extending filter run length to lower washing water waste and improve treated water collection.
- Possible to quicken filter run length to save space for installation of equipment.
- Prevention of filtration blockage due to syendra, microcystin, etc.
- Prevention of mad ball forming at the surface of sand layer.
2. Micro-flocs growing easily
Since the grain has complicated form and angularties, suspended solids are retained in the inter granular spaces throughout the greater part of layer depth. After addition of coagulant, the water to be treated which has been sent out the filter without agitation is agitated and generates micro-flocs while it passes through the inter granular space . It results in improvement of treated water quality.
- Improvement of treated water quality
3. Easy change from Single-medium filtration (by use of Filter sand) to dual-media filtration
The washing method of Anthracite Filter Media is the same as that the filter sand. It is no need to install new washing equipment additionally in case of changing the existing filter from single-medium filtration by only use of filter sand to dual- media filtration by use of Anthracite Filter Media together. it is possible to improve the filtration effect by removing a part of Filter sand and fill up with Anthracite filter Media there.
- Improvement of filtration effect with reasonable budget
4. High resistance to chemicals
Since anthracite of good quality contains less impurities and much carbon and it is not dissolve in acidic and alkaline water, it is suitable as a filter medium and also used in the chemical industry for the filtration of brine in soda manufacturers.
- Possible to use with various chemicals
5. Being used as a carrier for bio film treatment
Since Anthracite Filter Media have high void percentage and large specific area, Bio film is easily formed on them. The medium is the most suitable not only for physical filtration but also as a carrier for Bio film treatment.
- High effect as a carrier for bio film treatment
