Drinking water;  AFM® filtration
Pre-treatment prior to membranes:

Fouling of membranes for desalination RO and ultra-filtration is a major cost. AFM® reduces fouling because it does not contain free silica, indeed AFM® will remove silica from water and help prevent silicate blockage. Sand filters are biofilters and constantly discharge bacterium into the product water to foul the membranes. AFM® resists biofouling and does not become a biofilter. AFM®  grade 1 filters the water down to sub 4 microns (97%) AFM® grade 0 achieves 98% at 1 micron with no flocculation. In comparison to sand the SDI will be reduced by a further 50%. When AFM® is combined with a ZPM static mixer and APF PolyFloc, performance will be even better. Phosphates and many dissolved chemicals will be removed and effective particle size reduction will be 0.1 microns.


Drinking water; AFM® filtration and aeration
Removal of heavy metals (arsenic, ferric, chromium, manganese):

AFM® will remove many heavy metals from the water, but it is particularly effective for arsenic and ferric. Contaminated water is usually ground water which must be strongly aerated for a period of at least 30 minutes prior to filtration.  If arsenic needs to be removed additional ferric may be added to achieve a ratio of 10:1 (ferric:arsenic) to facilitate oxidation and co-precipitation. AFM® will remove arsenic to under 10 ug/l and ferric to well under 50 ug/l. The process is 100% sustainable, the AFM® does not get consumed and will give 10 or more years of efficient service.


tertiary treatment

Wastewater; AFM®filtration
Tertiary treatment of effluent:

Municipal waste water treatment plants will always discharge a low concentration of solids into the product water. The solids will be bacterial cell biomass and bound up in the solids may be priority chemicals such as heavy metals (chromium, lead, mercury or cadmium) or PCBs and PBDE.  If the water is discharged into a sensitive ecosystem, or if the water is intended for second use, then tertiary treatment is required. AFM®replaces the sand in the tertiary treatment filters and will double the performance of the filters.  AFM®will not biofoul, as long is there is some oxygen in the water.  This makes AFM®a sustainable, low cost, yet very high performance system.


boy diving

Water treatment for swimming pools: AFM®, ZPM, APF, ACO & NoPhos

With the Dryden Aqua Integrated System (DAISY) we provide the best and healthiest water and air quality in the market at the lowest costs.  The systems were developed from our work with the aquarium industry looking after dolphins and orca.  The marine mammals live in chlorinated systems, and unless the conditions are perfect,  the animals may suffer from poor water and air quality.The chlorine smell is actually trichloramine that also causes corrosion of the building and ventilation systems. Pools should not smell of chlorine, your eyes should not sting and you should always be able to see the length of the pool under water.  With a Dryden Aqua DAISY system you will have all of these advantages for pool useres and staff, plus a much lower running cost.



glas water

Drinking water; gas stripping with aeration
Removal of THM`s, Radon and volatile gas from drinking water:

Volatile gas such as the chlorine disinfection by-product THMs (chloroform), Radon radioactive gas and other volatile gases are stripped out of the water using our drop in air diffusers. Air diffusers are dropped into the buffer header tanks after filtration to gas strip chloroform. Aeration gas stripping may be applied before the filters to remove Radon and other volatile gases such as VOCs.


effluent treatment agricultural waste

Wastewater; AFM®filtration and aeration
Effluent treatment of agricultural waste:

Effluent from cattle or swine needs to be treated prior to discharge, or second use as irrigation water. The effluent is often stored below the floor of the cattle shed or in external tanks. Dryden Aqua air diffusers can be dropped into the tank below the floor to treat the effluent and improve air quality in the shed. The waste may require further aeration as activated sludge outside the shed. This improves the quality of the effluent by converting ammonium into nitrate. If a higher quality water is required the discharge from the activated sludge may be decanted then filtered by AFM®in a simple gravity flow of pressure sand filter.