Legionella pneumophila is a pathogenic bacterium commonly present in water systems such as cooling towers and closed loop circuits.  Legionella pneumophila is transmitted as an aerosol and under certain conditions exposure can lead to a respiratory infection that causes pneumonia. 

 Nanofibre cartridges for the control of Legionella pneumophila in Building Services Water Systems

The use of Amazon Filters Nanofibre cartridges can help control Legionella pneumophila in Building Services Water Systems.  Amazon Filters SupaPore Nanofibre cartridges that remove Legionella pneumophila could also be used in conjunction with other sanitisation treatments, to inhibit growth of the bacterium in all such water systems.

Laboratory testing has been carried out to assess the performance of Amazon’s SupaPore Nanofibre filter media under different challenge levels and different flow rates. These studies have shown that the media is able to remove in excess of 99.9% of bacteria across flow rates varying from approximately 12 litres/min/10” length cartridge up to approximately 50 litres/min/ 10” length cartridge.

There is significant legislation governing control of legionella in water systems and currently techniques such as treating with chemicals, or heating water to high temperatures are used to help meet the requirements of such legislation, but neither are without their drawbacks.  These methods may be effective initially, but the microorganisms can grow again to significant numbers very quickly. Also increasing energy costs and health and safety concerns means that heating water is becoming less desirable and environmental pollution concerns arecausing increasing restrictions on the use of chemicals. Supplementing existing methods with the use of Amazon Filters SupaPore Nanofibre cartridges in Side Stream filter systems can offer a reduction in energy costs, safer operating practices and reduced dependence on hazardous chemicals.

Amazon Filters SupaPore Nanofibre filters

Amazon Filters SupaPore Nanofibre filters

There are several documents and websites (most freely available) that provide guidance on the management processes and technical solutions for preventing Legionnaires’ disease in building services – http://www.cibsejournal.com/cpd/2012-07/.

The HSE website www.hse.gov.uk/legionnaires has extensive information, including a link to approved COP L8  Approved COP L8 (Legionnaires’ disease the control of Legionella bacteria in water systems approved COP L8 ) is aimed at dutyholders, including employers, those in control of premises and those with health and safety responsibilities for others, to help them comply with their legal duties in relation to legionella.  These include identifying and assessing sources of risk, preparing a scheme to prevent or control risk, implementing, managing and monitoring precautions, keeping records of precautions and appointing a manager to be responsible for others.

SupaPore Nanofibre filters contain a pleated filter media that exhibits a very high level of positive charge under a wide range of process conditions. This provides a cartridge that offers both high flow and removal of ultrafine contaminants such as endotoxins, bacteria such as legionella, viruses, colloids, heavy metals and hydrocarbons.

The heart of the filter is a nanoalumina and glass microfiber media that delivers >50 millivolts Zeta potential at pH 7.2. This construction also produces a filter media with a very high internal surface area. A sheet of media of 1 m2 has approximately 42,000 m2 internal surface area. Therefore SupaPore Nanofibre filters are a very cost effective method for removing negatively charged contaminants from aqueous solutions and polar solvents.

SupaPore Nanofibre filters are an alternative to the use of ultrafiltration or very fine sub-micron membrane filters for many applications. The media has passed USP Class VI Plastics testing and meets NSF standards 42 and 53 for potable water, so can be used in both critical and industrial applications. The high level of positive charge allows the use of a relatively open porous structure, providing much higher flow rates when compared to existing technology.

Typical applications include :-

  • Bacterial bioburden reduction and virus removal
  • Removal of endotoxins from purified water and pharmaceutical processes
  • Purification of drinking water
  • Protection of RO membranes from premature fouling by colloids, organic material, particulates etc
  • Activated carbon fines capture
  • Reduction in levels of heavy metals from waste streams e.g. plating facilities
  • Dissolved trace oil removal
  • Rouge removal in boiler / heat exchanger applications

Feature and Benefits

  • Relatively open porous structure offering high flow rates and long in-process life times
  • High Zeta potential for effective removal of ultrafine contaminants
  • Enormous internal surface area providing high capacity for contaminant removal
  • Media tested to ensure suitability for critical processes including pharmaceutical applications and potable water
  • Product Validation Guide available on request.

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This entry was posted on 4th Apr 2014