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Legionella Control International Legionella Awareness Flash Cards

Paul Jeffreys Inglés 30 fichas

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1Legionella Like ?Temperature 20C - 45C
Stagnant Water
Biofilm
Amoeba
Iron
L-Cysteine
Oxygen
2—Chlorine Dioxide
An Oxidising Biocide
Does not react with water
Almost 100% Biocidal Activity at pH 10
3—Written Scheme of Precautions
Who does what Legionella related Tasks, when and at what frequency.
4—Aerosol
created by water impacting on any surface
infected droplets < 5 microns can reach deep into the lung.
5—Assets that generate a risk are
Dead Legs
Dead Ends
Taps
Showers
Long Pipe Runs
Expansion Vessels
6—Guidance on Managing
Cooling Towers to mitigate the risk of Legionnaires disease
7—Guidance document released 2016
Spa Pools
8—Written Scheme of Precautions
Describes
Who does what Legionnaires related tasks and at what frequency.
9—How oxidising biocides kill a bacteria like legionella by denaturing proteins in the cell wall.
10—Amoeba
Protozoa
Plays an important part in the life cycle of the Legionella Bacterium
11—Graph demonstrates that HOCL and HOBR become less effective as the pH of the water increases.
Chlorine Dioxide remains effective even at pH 10
12—Hydrogen Peroxide
an oxidising biocide that produces Oxygen and water when it reacts with bacteria.
13—A petri dish for developing Legionella
Black because of the ingredients in the culture media.
14System SchematicRequired to enable a suitable and sufficient Risk Assessment,
Can be hand drawn or computer generated
15Legionella TrainingTraining is required for all those involved in the control of the Legionella risk in the premises water systems.
16Risk Assessment Rating SystemCan be colour coded or numerical but must be clearly understood and unambiguous.
17—Chlorine an oxidising biocide has universal use in potable water disinfection.
Residual range typically 0.1 ppm - 0.5 ppm
18Rust or CorrosionLeads to reduced water flow, stagnation of water and provides Iron to the Legionella bacterium, one of its required nutrients.
19—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
20—Those at risk
middle aged men
Immune compromised
Alcoholics
Diabetics
Those with Heart Lung Kidney Disease
Smokers
21—Found in soils and waters even in potting compost
22—Legionella is not contagious person to person.
A person gets infected by breathing in an aerosol from a contaminated water source.
23—Planktonic Free Floating Bacteria
Sessile Adhered to surface
24—Sequence of events and conditions that creates an increased risk in water systems from the Legionella bacterium.
25—Desired Features of a Calorifier
Insulated
Temperature Guages
Inspection Hatch
Drain
Shunt Pump
Easy Access
26—Copper & Silver
Creates Copper & Silver Ions
These disrupt the metabolism of bacteria
27—Ultra Violet Light
Kills Bacteria by damaging DNA
Not very effective against estblished biofilms
Better in new or virgin water systems
28BiofilmA 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.
29—Flexible Hoses
If they contain EPDM will present a risk due to internal cavities.
These present areas for bacteria to proliferate
30—SPA POOLS
If poorly maintained can present an infection risk from a number of water borne pathogens.