54
SPN DEC 2011 FiltrationMedia
generating Vibrio bacteria, cholera is a Vibrio bacteria species.
STANDARDS & PERFORMANCE The filter media is at the heart of any water treatment system, but it is still only one part of a process.
Unless the filtration is integrated with the rest of the system then best performance is difficult to achieve. To help pools achieve the best results Dryden Aqua developed the PAWS standard (Pool Air & Water Standard)
www.swimmingpaws.com The PAWS standard is in compliance to the German DIN standard, but it also takes the standard to the next level to include extra water quality and biological parameters, as well as air quality. The objective is for all pools to be in compliance to DIN or PAWS and to help pools achieve this performance standard Dryden Aqua have developed a free online service
www.waterandairquality.com
The pool water and air quality service is open to all pool operators.
CHLORINE DEMAND
Most pools in the UK have a chlorine demand of 6g to 10g of chlorine per bather, this equates with a DAP Factor of six to 10. Pool water treatment systems in accordance to the German DIN standard will have a DAP factor of 3 to 6. The main difference between the two is the performance of the filtration system. With the Dryden Aqua system the DAP Factor will be between one and four, this means there is up to 10 times less chlorine used to oxidise waste chemicals in the water. The less chlorine used, the lower the concentration of chlorine by- products. The system design will also affect the type of by-products formed, by way of example medium pressure UV will generate high levels of nitrate and volatile gas such as chloroform and cyanogen chloride. A recent report published in the Journal of Environmental Health relates attendance to swimming pools and the development of spinal deformities in children. “The objective of Dryden Aqua has been to eliminate the problems and provide a simple solution, we can now report that we have achieved this task,” added Dr Dryden.
COST SAVINGS
The cost of running a water treatment system relates to the energy used and the amount of water and chemicals consumed. It is also important to reduce the cost of servicing and consumable components. Dryden Aqua’s integrated system is a stable process using quality filters in combination with AFM media, APF (active polyfloc) and ACO (active chemical oxidation) and ZPM (zeta potential mixers). Three case studies are reaching a conclusion in the UK. Each pool has a bather load between 600 and 1,000 per
AUSTRALIAN GLASS MEDIA SUCCESS STORY LAUNCHED INTO THE UK
A new Waterco Glass Bead filter media manufactured from 100% virgin glass has been launched on the market – capable of providing water of superior clarity and needing less water for backwashing. The Waterco product is new to the UK but the company has had fantastic results with it in Australia, headquarters of the parent company.
The product represents a new generation of glass media filters needing up to 25% less water for backwashing and is chemically inert and free from contaminants.
Glass beads have a small effective size of only 0.6mm to 0.8mm. Its narrow particle size range allows in-depth filtration and extends operating cycles between backwashing. Glass beads have been laboratory tested to be able to effectively filter down to below 3 microns. Glass bead’s spherical smooth shape, results in a low co-efficient of friction, reducing its backwash water requirements.
Waterco glass beads have been independently lab tested for leeching contaminants and found to be well within Australian Drinking Water Guidelines. The glass beads are spherical and do not have any sharp edges. They are safe to
handle and safe to service. If there is ever a failure of the filter’s laterals and glass beads flow into the swimming pool, they pose no risk of injury to swimmers. Glass beads are easy to install and enables a rapid start up of the media filter. Its high purity means very little backwashing is required to cleanse the filter media, prior to commissioning the filter.
i FOR FURTHER INFORMATION
F WATERCO EUROPE ( 01795 521733 :
www.waterco.eu
www.swimmingpoolnews.co.uk
day, the first pool was on ozone, the second pool on UV and the third pool was a typical system just on sand filters.
The first pool system upgrade consisted of turning off the ozone generators and replacing the activated carbon and sand with AFM. Two ZPM modules were fitted and APF as well as ACO dosed into the water. Dryden Aqua products will gradually remove decades of rust and biofilm from the inside of the pipes and any surface in contact with the water. System up- grades of old pools can therefore take up to six months to fully stabilise. The combined chlorine level is now an average 0.2 mg/l and often the reading is zero. The levels of nitrogen trichloride in the atmosphere have essentially dropped to zero, there is no smell in the building and zero complaints from the bathers. The water is bright and sparkling with no turbidity (<0.05 ntu) and complete visibility along the 25m length. The direct cost savings attributed to the Dryden Aqua integrated system amount to 20% of the running costs which give a return in capital in under 14
months out of revenue savings.
The elimination of corrosive disinfection by- products helps prevent damage to the ventilation systems and stress corrosion cracking of the building, bather numbers usually increase and staff sick days decline.
When the indirect savings are included, the total cost saving and benefits exceed £100,000 a year. Dryden Aqua is to hold a seminar in Switzerland in March 2012 to present the results and to confirm the company has completed pool water treatment research.
“It is now confirmed that the Dryden Aqua Integrated Pool Water Treatment System will greatly reduce the risk to the public and pool staff to make swimming pool environments a safer place to work and play,” added Dr Dryden. spn
i FOR FURTHER INFORMATION
F DRYDEN AQUA ( 01875 822222 :
www.drydenaqua.com
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