 | AFM active filter media replaces sand & activated carbon |
| Desalination Pre-Treatment system iron removal schematic click here |
| Dryden Aqua are marine biologists specializing in the mechanical filtration of seawater for the aquaculture industries. AFM® is a product developed by Dryden Aqua to replace sand in any type of sand filter. AFM will physically remove particles half the size of the smallest particle than can be removed by sand filters. However in addition to the physical filtration of solids, AFM® also has surface active properties and the media will adsorb micron, sub-microns as well as dissolved organics from the water. In this respect AFM will give a better performance than UF at 0.03 microns, and much better protection to the membranes. |
Dryden Aqua are marine biologists specializing in seawater filtration systems for the aquaculture industry over the last 25 years. It is absolutely essential to have the best possible filtration when trying to cultivate delicate marine fish. Any deficiencies in the the treatment systems can result in rapid fish mortalities.
System specification.
The performance of any media bed filtration system be it sand or
AFM will vary inversely proportionally
SDI simply by changing the sand and replacing it with AFM® media, you will double the performance of your filters, and present a much better water quality to the membranes. Typically, by changing the sand and anthracite in your filters to just AFM® you will reduce the SDI ( Silt Density Index) values by 50% to 80%. For example in a comparable trial with sand and AFM®, the discharge from AFM® was 1.5 and from sand it was 3.5 on average, the influent SDI was actually too high to measure. Filter velocity was 8 cubm/hr/sqm Ultra filtration will give very good mechanical filtration, however the SDI does not give the full story. When AFM® is combined with pre-coagulation and flocculation with APF injected into a ZPM (zeta potential module) AFM® will remove micron and sub-micron particles below 0.05 microns as well as dissolved organics. This would be impossible using UF membranes, so a relatively low cost procedure using AFM® can be much more efficient that Ultra Filtration. AFM® with pre-coagulation and flocculation using a ZPM and APF will provide a better performance that UF, and protect the RO membranes from silica, phosphates and nutrients that would otherwise contaminate the membranes and cause bacterial growth. AFM will performance sand, anthracite or expanded clays.
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to the flow of water through the filter bed, so the slower the run phase water flow the better the performance. It can sometimes be a false economy to use high water flow rates to reduce the capital cost and foot print of the system, as it may result in extra running costs for the membranes. In all cases irrespective of water flow rat