12207598
Descrição
FlashCards por Paul Jeffreys, atualizado more than 1 year ago
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Criado por Paul Jeffreys
quase 7 anos atrás
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| Questão | Responda |
| Legionella Like ? | Temperature 20C - 45C Stagnant Water Biofilm Amoeba Iron L-Cysteine Oxygen |
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Clo2 (binary/octet-stream)
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Chlorine Dioxide An Oxidising Biocide Does not react with water Almost 100% Biocidal Activity at pH 10 |
| Written Scheme of Precautions Who does what Legionella related Tasks, when and at what frequency. | |
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Shower (binary/octet-stream)
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Aerosol created by water impacting on any surface infected droplets < 5 microns can reach deep into the lung. |
| Assets that generate a risk are Dead Legs Dead Ends Taps Showers Long Pipe Runs Expansion Vessels | |
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Guidance on Managing Cooling Towers to mitigate the risk of Legionnaires disease |
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Guidance document released 2016 Spa Pools |
| Written Scheme of Precautions Describes Who does what Legionnaires related tasks and at what frequency. | |
| How oxidising biocides kill a bacteria like legionella by denaturing proteins in the cell wall. | |
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Amoeba (binary/octet-stream)
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Amoeba Protozoa Plays an important part in the life cycle of the Legionella Bacterium |
| Graph demonstrates that HOCL and HOBR become less effective as the pH of the water increases. Chlorine Dioxide remains effective even at pH 10 | |
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Hydrogen Peroxide an oxidising biocide that produces Oxygen and water when it reacts with bacteria. |
| A petri dish for developing Legionella Black because of the ingredients in the culture media. | |
| System Schematic | Required to enable a suitable and sufficient Risk Assessment, Can be hand drawn or computer generated |
| Legionella Training | Training is required for all those involved in the control of the Legionella risk in the premises water systems. |
| Risk Assessment Rating System | Can be colour coded or numerical but must be clearly understood and unambiguous. |
| Chlorine an oxidising biocide has universal use in potable water disinfection. Residual range typically 0.1 ppm - 0.5 ppm | |
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Rust or Corrosion
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Leads to reduced water flow, stagnation of water and provides Iron to the Legionella bacterium, one of its required nutrients. |
| Design Features of a Cold Water Tank Insulated Screened from vermin and insects Well fitting lid Expansion return routed to a tundish Inlet and outlet diametrically apposed | |
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Those at risk middle aged men Immune compromised Alcoholics Diabetics Those with Heart Lung Kidney Disease Smokers |
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Found in soils and waters even in potting compost |
| Legionella is not contagious person to person. A person gets infected by breathing in an aerosol from a contaminated water source. | |
| Planktonic Free Floating Bacteria Sessile Adhered to surface | |
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Sequence of events and conditions that creates an increased risk in water systems from the Legionella bacterium. |
| Desired Features of a Calorifier Insulated Temperature Guages Inspection Hatch Drain Shunt Pump Easy Access | |
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Copper & Silver Creates Copper & Silver Ions These disrupt the metabolism of bacteria |
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Ultra Violet Light Kills Bacteria by damaging DNA Not very effective against estblished biofilms Better in new or virgin water systems |
| Biofilm | A home and nutrient source for Amoeba and water borne pathogens including Legionella. Very difficult to kill biofilms either with high water temperature or oxidising biocides. |
| Flexible Hoses If they contain EPDM will present a risk due to internal cavities. These present areas for bacteria to proliferate | |
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SPA POOLS If poorly maintained can present an infection risk from a number of water borne pathogens. |
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