WATER TREATMENT

 

Silver Peroxide

Fortunately as we enter the new millennium a biocide is available which could almost be described as the designer biocide for disinfecting water storage tanks. Silver Peroxide is a catalysed and extremely stable hydrogen peroxide. It is easy to handle, apply and measure at user concentrations.

It breaks down to water and oxygen and therefore cannot form unwelcome by-products. Silver Peroxide has approval by the Secretary of State for the Environment under Regulation 25 (1)(a). It adds neither taint, taste or smell to the water.

Perhaps its biggest plus is that it can deal with biofilm. Silver Peroxide represents a cleaner, safer, more environmentally secure method for disinfecting water storage tanks.

Silver Peroxide is an innovative "green" biocide, which allows property managers to save money as well as improving their company’s environmental profile.

 

Constant Dosing

The constant dosing of a biocide into the domestic water supply to a multi occupancy building like a hotel, prison, or halls of residence is now generally recognised as a suitable method for managing water system hygiene.

The concept is generally sold on the grounds of savings for the proprietor of the building and result (in soft water areas) from reduced tank cleaning and disinfection, no requirement to clean showerheads or monitor water temperatures throughout buildings.

The largest savings can be made on the heating of water. Water heated to 60 Deg C in a building, the recommended temperature for Legionella control, represents a scald hazard.

The constant dosing of a biocide means that hot water temperatures can be reduced saving on energy costs and reducing the scald risk to building users.

 

Silver Peroxide and Constant Dosing

Silver Peroxide will ensure the water is completely sterile, and also deal with the biofilm. Because of its stability up to 900  C, Silver Peroxide will protect the hot water system.

Silver Peroxide will not only provide sterile water throughout the building but will provide water free from taste, taint, or odour.

Silver Peroxide is easy to dose, detect, monitor and control. It breaks down to water and oxygen and there is therefore no difficulty with breakdown products.

The dosing equipment required for Silver Peroxide is a standard dosing tank, dosing pump and water meter.

 

Silver Peroxide use in Hotels, Commercial properties and Hospitals

Silver Peroxide is a disinfecting chemical which is based on stabilised hydrogen peroxide. It is ecofriendly in that it breaks down to water and oxygen.

HS (G) 70 would allow building managers to continuously dose their incoming water rather than carry out the tank disinfection / showerhead cleaning / high calorifier temperature regime which is widely practised in commercial properties.

Silver Peroxide presents none of the problems associated with chlorine dioxide dosing.

  • Chlorine dioxide is difficult to dose because it must be made at point of use.
  • Chlorine dioxide is also a hazard if it escapes into the atmosphere and a number of buildings have had to be evacuated when leaks occur.

The chemical is dosed using conventional dosing equipment. It can be measured accurately in water using online and off-line techniques and it deals efficiently with all micro - organisms likely to be found in a domestic water system. Tevan who manufacture the product in Holland have recently commissioned an independent test where the efficacy of Silver Peroxidewas compared with that of chlorine and this favourable test confirmed that Silver Peroxide would be an ideal water disinfectant. The product is approved by Secretary of State for the Environment under Regulation 25 (1) (a).

 

Cost savings

Cost savings are possible because Silver Peroxide will remove biofilm and scale from pipework and the internal surfaces of tanks and other equipment.

Constant dosing saves money in the following areas.

  1. There is no need to remove and disinfect showerheads.
  2. There is less need to clean and disinfect Cold Water Storage Tanks.
  3. There is no need to take water temperature checks on a regular basis.
  4. All microbiological checks, logbook updates etc are part of the contract.
  5. The addition of Silver Peroxide means that your calorifiers will be cleaner, reducing the requirement to blow them down.
  6. If conditions in the hotel allow hot water temperatures can be reduced by 10 0 C This will save energy and will also remove the scald risk potential.

We can advise on the best ways of optimising these potential savings.

 

Other advantages

Silver Peroxide offers a number of other advantages to hotel guests. They bathe and shower in sterile water without risk of scalding. The water in each room should comply with EC Drinking Water Regulations and is therefore potable. The presence of disinfectant in water will minimise toilet odours.

OLD STYLE CLEANERS

The cleaning and disinfection of cold water storage tanks in commercial and industrial properties is a low-tech business carried out by water treatment companies, facilities management companies and plumbers using a standard chlorination procedure described in paragraph 65 Of HS (G) 70 1993 Edition.

The chemical used to disinfect tanks is invariably bleach, Sodium Hypochlorite (14.5% w/w available chlorine). Bleach is selected because its reactions and efficacy are well understood – it is the mainstay of potable water disinfection throughout the United Kingdom. Bleach kills the range of microorganisms likely to be found in a cold-water storage tanks. It is easily applied, neutralised and measured at user concentrations.

While chlorine and the other halogens are good at killing the microorganisms (The free-swimming planktonic bacteria) present in water; these chemicals cannot penetrate and remove biofilm. Bleach has little effect on the thin adhesive microscopic layer present on the wetted surfaces of almost every cold water system.

Bleach cannot be considered as environmentally friendly. Chlorine reacts with organic materials in the water to form trihalomethanes (THM’s) which are restricted to a level of 0.5mg/l by the EC in public water supplies

The effect of bleach in water cannot be described as neutral as the chemical adds taste taint and smell to the water.

 

Building Water Services: Other Silver Peroxide Applications

Silver Peroxide can be used as a water disinfectant in a number of other areas in multi occupancy buildings. In many of these areas it can offer considerable advantages over the biocides, which are used at present.

  1. Fountains and Water Features

    Bromine or bromine-based chemicals are the most widely used in water features in public buildings. Perhaps the main problem associated with bromine is the smell, which, depending on the location of the water feature can cause offence to guests. Silver Peroxide will not impart smell to water.

  2. Spray Humidifiers and Air Washers

    These can be cleaned and disinfected with Silver Peroxide. It would be appropriate to constantly dose any water which is added to air in a building as this will reduce airborne bacteria and viruses. Silver Peroxide should also be used to fog air conditioning ducts.

  3. Horticulture Misting Systems

    These should be cleaned and disinfected with Silver Peroxide.

  4. Car, Bus and Train Washes.

    Legionella was recently found to be a problem in train washers in Holland. Silver Peroxide was applied to remove Legionella from the systems. These systems where water can remain stagnant for long periods are prone to the development of biofilm and perhaps Legionella.

  5. Spa Baths

    Silver Peroxide is perhaps the best chemical on the market for removing the biofilm from spa baths. It is safe to apply and frequent application will ensure that the bath remains reasonably disinfected and will not give rise to the microbiological soup.

    For more information please contact : mailroom@dbecosystems.com