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Posted By STEVE
Anyone have experience of the above?
My question is
We are to decontaminate the packing from a Davenport that has collapsed.
The Davenport has been out of use for at least 6wks, before this it was chlorinated on a routine
However since the collapse the packing has been left in stagnant water for this period of time.
Water does not look healthy, algea, slime , murky etc
The packing is absolute choker what looks like iron deposits, some of this packing has been removed dry, other is still in stagnant water.
My question do I treat the dry packing with caution (can legionella survive in dry conditions?)
After 6wks in stagnant water can legionella have developed, conditions look favourable (moisture algea, slime indoors, warmth)
How quickly can Legionella develop in favourable conditions?
Should dry packing be cleaned under caution of this or just for the dust hazard
Sample shows 65%iron deposits in packing with a Ph level of 4
Any info , advice cautions controls would be appreciated
Thanks
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Posted By Charley Farley-Trelawney
Steve
To save writing a plethora of information, most, if not all of your questions can be answered here:
http://www.hse.gov.uk/research/rrpdf/rr140.pdf
If you do not find what you need, email me and I will let you have the definitive answers.
C
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Posted By Mike Draper
I'm certainly not an expert but a quick look around turns up the following http://www.uaw.org/hs/01/02/hs01.html
You appear to have some conditions that would promote growth of the bacteria (stagnant, warmish), but others that might inhibit growth (low Ph).
The main issue with legionella though is whether the bacteria can be spread as an aerosol - it is this route that usually results in legionellosis. There may however be other things to consider, i.e. infections spread through scratches (tetanus, etc).
I would consider the range of possibilities and the risks. I suspect you need a number of measures in place.
Some things to consider are:
Can you drain the area? Can you clean before you continue work? If you clean what technique do you use? etc. Once you've exhausted this line, then look at the residuals. Can you control them through simple hygiene practices? If not, what else is needed? Finally you come to PPE - the last resort.
Hope that's all of some help.
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Posted By col
with reference to your questions.
A) Legionella can lie dormant within dry packing and can proliferate once the packing gets wet. In Australia(I know we arnt there) the bags of soil have a legionella warning attached recommending care when used in windy conditions.and to damp down prior to usage.
B) You can disinfect a system today and legionella can contaminate the system the same day if conditions are right. A disinfection is like an MOT only valid at the time it was done.
C)Legionella loves iron deposits but does not favour pH 4
In my opinion if the packing is dry then dispose of dry. disinfect the tower prior to any works being undertaken ensuring that the appropiate ppe (especially face mask) is worn AND DO NOT use a pressure jetter or hoses as this can create aerosols.
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Posted By STEVE
Many Thanks
For the response to my questions, especially your comments Col, these back up what I had identified but wasnt hundred percent sure I had interpreted correct
Steve
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