As described in the Australian Drinking Water Guidelines, disinfectants are an essential step and widely used in the production of safe drinking water. Choosing the appropriate disinfectant is an important decision for effective drinking water quality management in any water supply system.
Many factors need to be considered before deciding which is the most appropriate disinfection method for each water source: type and concentration of organic matter present in the treated water, PH and temperature of the water, by-products, ongoing protection from pathogenic micro-organisms, affordability, operating costs etc.
Alscore distributes products related to four different disinfection techniques: Ultraviolet Light, Liquid Chlorine (sodium hypochlorite) dosing, Ozone and Silver-Ion.
UV light disinfection is a treatment option that can contribute to the effective implementation of a multibarrier approach that reduces microbial risk in drinking water supplies. UV light disinfection can be used as the primary disinfectant for the inactivation of chlorine resistant pathogens.
UV sterilization has a minimal effect on the chemical composition or taste of water and unlike chemical disinfectants, high dosage or over-dosing with UV light presents no danger and is sometimes considered as a safety factor.
Alscore UV units are available for domestic, commercial and industrial use and are characterized by compactness and ease in installation/servicing, they have been specially designed as a fundamental completion for other equipments (reverse osmosis systems, coolers, water dispensers, etc.)
Chlorine is the most common drinking water disinfectant used around the world. It is a strong disinfectant with excellent bactericidal and virucidal properties and is effective at short contact times. Is more effective on lower pHs and can be applied as a primary disinfectant at the point of entry into the drinking water distribution system or as a secondary disinfectant within distribution systems to boost concentrations of chlorine residuals in the system as a barrier against regrowth of opportunistic free-living pathogens.
Chlorine can be applied as a gas, liquid (sodium hypochlorite) or solid (calcium hypochlorite). Due to the strict safety requirements associated with the use of gaseous chlorine, liquid chlorine, which is easier to dose, is often used in preference to gaseous chlorine or solid.
Ozone is generated on site by passing an electric discharge through clean dry air or oxygen. The resultant ozone is a very strong biocide and oxidising agent, and is effective in reducing colour, taste and odour, and oxidising iron and manganese. Ozone is highly sensitive to turbidity. Turbidity should be less than 1 NTU at the time of ozonation. The pH should be less than 8 for effective disinfection because ozone is unstable above pH 8 (at pH 8, half of the ozone is lost in less than 30 minutes).
Silver Ion can be used as a secondary disinfectant, to reduce levels of chlorine, in drinking-water supplies. It is quite commonly used in conjunction with copper ionization as a preventative measure against colonization of Legionella spp. in hospital hot water systems. Silver Ion is a water disinfectant that does not result in disinfection by-products, but based on health considerations, the concentration of silver in drinking water should not exceed 0.1 mg/L.
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