Prevention of Legionella: Is there miracle methods? Contact us by phone November cuno 24 85 46 or email: post@norkjemi.no
"We constantly see that vendors claim to offer miracle methods that solves all requirements for regulation plated legionella prevention but so simple it is unfortunately not," says Dr. Scient in biology, Hanne T. Skiri. She is Quality and HSE Manager in NorKjemi AS, an independent service and knowledge company within legionella control and water treatment. During commenting Skiri on this and gives a brief introduction and assessment of the most appropriate methods that are available.
Select the correct method The existing scope of different methods and providers often makes it difficult for property owners to know what is the best option for their particular plant. Managers and drifters must adhere to several regulations (including regulations cuno relating to environmental health, Drinking Water Regulations, Internal Regulations) while they want to ensure optimal and most energy efficient operating conditions. Empirically, there is no cheap and simple methods that can solve all challenges with regard legionella cuno control. The choice of method must therefore be based on knowledge of the plant, (including growth conditions and risk elements) and users of the facility. At a large facility with users who are in a risk group for developing severe legionellosis, eg. in nursing homes and large hotels, it should often be considered more extensive treatment than small plants that supply a few showers in a commercial building. A method that is beneficial for one plant may be less favorable for another. Whichever method you choose, replaces the non statutory requirements for regular inspection, inspection and documentation, cuno which are important elements of a complete legionella control program.
Assessment cuno before selecting the method of Legionella bacteria cuno grows preferably in a biofilm formed on the walls of water distribution networks. Biofilm can protect bacteria against both thermal cuno treatment, drying and certain chemicals such. chlorine. Some methods have excellent ability to remove biofilm, cuno while other methods to a small extent does this. For the disinfection of a plant must also make a choice between traditional heat treatment (which affects energy consumption) and the use of chemicals (some of which may provide environmental, health or operational cuno challenges). One must also have an understanding of the difference between the use of "biological barriers", which stops new bacteria from getting into the plant, often without being able to do so much with the remaining piping and disinfection methods that treat the entire plant. It must also be considered whether it is sufficient to treat hot part of the plant or whether the cold water system should be treated.
Available methods also follows a small review of the most appropriate methods within legionella prevention cuno of the water distribution network. Most systems offered in Norway today are variations of these. This is either bacteriological cuno barriers, only sanitizing methods or both cleansing and disinfecting methods.
Microfilter / ultrafiltration: A microfilter cuno can be installed on the main water intake to a building. The filter cuno will then prevent the supply of new microorganisms to the plant. A good filter system will help to reduce the supply of nutrients to the system, which can reduce the growth of certain types of bacteria. The disadvantage of the system can be lowered water pressure and problems with outages if the filter becomes clogged. The filter will have little impact on bacteria that are already cuno in the system and it does not remove existing biofilms. The system will therefore own itself best in new plants, or plants that have undergone extensive chemical cleaning cuno and disinfection.
UV light: Irradiation of water flow kills microorganisms and prevents new bacteria to establish cuno themselves in the plant. The weakness of the system is that microorganisms hiding behind / in particles is defused, and encrustation on the lamp glass reduces efficiency. If the UV lamp is only placed on water intake are not killed bacteria already present in the system. Biofilms are not removed.
Anodic oxidation: When electrolysis substances in water is converted to oxygen radicals, hydroxyl radicals, as well as small amounts of chlorine and hypochlorous acid. The radicals act locally by electrolysis device and effectively kills incoming bacteria, but will not work on out in the facility. In the presence of salts (Cl -) in the water formed small amounts of chlorine and hypochlorous acid which is led with the water flow. The amount of chlorine and hypochlorous acid can be increased by adding additional salt. See the next section for the impact of these disinfectants.
Chlorination (hypochlorite): There are two ways to chlorinate a system. Either by adding the hypochlorite to form hypochlorite or by installing an electrolysis device using salts which occur naturally in the water or fed. Free chlorine is a widely used disinfectant and used extensively in our water
"We constantly see that vendors claim to offer miracle methods that solves all requirements for regulation plated legionella prevention but so simple it is unfortunately not," says Dr. Scient in biology, Hanne T. Skiri. She is Quality and HSE Manager in NorKjemi AS, an independent service and knowledge company within legionella control and water treatment. During commenting Skiri on this and gives a brief introduction and assessment of the most appropriate methods that are available.
Select the correct method The existing scope of different methods and providers often makes it difficult for property owners to know what is the best option for their particular plant. Managers and drifters must adhere to several regulations (including regulations cuno relating to environmental health, Drinking Water Regulations, Internal Regulations) while they want to ensure optimal and most energy efficient operating conditions. Empirically, there is no cheap and simple methods that can solve all challenges with regard legionella cuno control. The choice of method must therefore be based on knowledge of the plant, (including growth conditions and risk elements) and users of the facility. At a large facility with users who are in a risk group for developing severe legionellosis, eg. in nursing homes and large hotels, it should often be considered more extensive treatment than small plants that supply a few showers in a commercial building. A method that is beneficial for one plant may be less favorable for another. Whichever method you choose, replaces the non statutory requirements for regular inspection, inspection and documentation, cuno which are important elements of a complete legionella control program.
Assessment cuno before selecting the method of Legionella bacteria cuno grows preferably in a biofilm formed on the walls of water distribution networks. Biofilm can protect bacteria against both thermal cuno treatment, drying and certain chemicals such. chlorine. Some methods have excellent ability to remove biofilm, cuno while other methods to a small extent does this. For the disinfection of a plant must also make a choice between traditional heat treatment (which affects energy consumption) and the use of chemicals (some of which may provide environmental, health or operational cuno challenges). One must also have an understanding of the difference between the use of "biological barriers", which stops new bacteria from getting into the plant, often without being able to do so much with the remaining piping and disinfection methods that treat the entire plant. It must also be considered whether it is sufficient to treat hot part of the plant or whether the cold water system should be treated.
Available methods also follows a small review of the most appropriate methods within legionella prevention cuno of the water distribution network. Most systems offered in Norway today are variations of these. This is either bacteriological cuno barriers, only sanitizing methods or both cleansing and disinfecting methods.
Microfilter / ultrafiltration: A microfilter cuno can be installed on the main water intake to a building. The filter cuno will then prevent the supply of new microorganisms to the plant. A good filter system will help to reduce the supply of nutrients to the system, which can reduce the growth of certain types of bacteria. The disadvantage of the system can be lowered water pressure and problems with outages if the filter becomes clogged. The filter will have little impact on bacteria that are already cuno in the system and it does not remove existing biofilms. The system will therefore own itself best in new plants, or plants that have undergone extensive chemical cleaning cuno and disinfection.
UV light: Irradiation of water flow kills microorganisms and prevents new bacteria to establish cuno themselves in the plant. The weakness of the system is that microorganisms hiding behind / in particles is defused, and encrustation on the lamp glass reduces efficiency. If the UV lamp is only placed on water intake are not killed bacteria already present in the system. Biofilms are not removed.
Anodic oxidation: When electrolysis substances in water is converted to oxygen radicals, hydroxyl radicals, as well as small amounts of chlorine and hypochlorous acid. The radicals act locally by electrolysis device and effectively kills incoming bacteria, but will not work on out in the facility. In the presence of salts (Cl -) in the water formed small amounts of chlorine and hypochlorous acid which is led with the water flow. The amount of chlorine and hypochlorous acid can be increased by adding additional salt. See the next section for the impact of these disinfectants.
Chlorination (hypochlorite): There are two ways to chlorinate a system. Either by adding the hypochlorite to form hypochlorite or by installing an electrolysis device using salts which occur naturally in the water or fed. Free chlorine is a widely used disinfectant and used extensively in our water
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