Graph 4.7 below. This graph shows the average count of all 10 outlets Legionella sampled monthly from the 06th March 2008 to the 19th July 2011. 1000 800 600 400 CFU/l 200 0 Legionella . 8 8 8 9 9 0 0 0 1 00 00 00 01 011 06 04 2 26 24/11/20101 2 0 0 26/11 28 2 8 0 0 1 /05 1400 /0 /0 /0 /12/20 /0 08 /0 /0 /03/20 3/ 6 9 3 2 8 4 4 0 6 9 1200 Graph 4.7 Study hospital 3 Average results from the 06th March 2008 to the – Legionella 19th July 2011. Graph 4.8 shows the average copper levels found in samples taken monthly from 10 outlets from the 06th March 2008 to the 19th July 2011. The treated water started to discolour in 2009, which may have been due to high phosphate levels in the mains water supply potentially forming precipitates with the higher levels of copper, and the copper side of the ionization system was turned off from the 08th June 2009 onwards. The average copper levels in samples on the 08th June, the 09th July and the 04th August 2009 remained, however, above 0.2mg/l, at 0.26mg/l, 0.241mg/l and 0.35mg/l respectively, which was most likely residual copper from the ionization treatment as well as copper leaching from the copper pipes in the water system, but the levels reduced from the 27th August 2009 onwards. The average copper level from the 27th August to the 19th July 2011 was 0.093mg/l (± 0.025mg/l), which was solely the copper that had leached from the copper pipes. 108
Graph 4.7 below. This graph shows the average Legionella count of all 10 outlets sampled monthly from the 06th March 2008 to the 19th July 2011. Legionella CFU/l 1400 1200 1000 800 600 400 200 0 00 . 8 8 8 9 9 0 0 0 1 011 06 04 00 2 00 26 01 24/11/20101 2 0 0 26/11 28 2 /0 8 0 0 08 /0 /05 /0 1 /0 /0 /12/20 /0 /03/20 3/ 4 6 9 4 3 2 8 9 0 6 Graph 4.7 Study hospital 3 – Average Legionella results from the 06th March 2008 to the 19th July 2011. Graph 4.8 shows the average copper levels found in samples taken monthly from 10 outlets from the 06th March 2008 to the 19th July 2011. The treated water started to discolour in 2009, which may have been due to high phosphate levels in the mains water supply potentially forming precipitates with the higher levels of copper, and the copper side of the ionization system was turned off from the 08th June 2009 onwards. The average copper levels in samples on the 08th June, the 09th July and the 04th August 2009 remained, however, above 0.2mg/l, at 0.26mg/l, 0.241mg/l and 0.35mg/l respectively, which was most likely residual copper from the ionization treatment as well as copper leaching from the copper pipes in the water system, but the levels reduced from the 27th August 2009 onwards. The average copper level from the 27th August to the 19th July 2011 was 0.093mg/l (± 0.025mg/l), which was solely the copper that had leached from the copper pipes. 108
Birgitta-Bedford-Thesis-2012.docx