Independent assessors have been confirmed:
For all of the test bacteria a considerable reduction could be proven because of the operation of the UV-disinfection plant PURION 1000 (see spreadsheet).
Reduction of the bacteria that have been in focus of the examination:
|parameter||colony count at 36°C||Pseudomonas Aeruginosa||Escherichia Coli|
influent flow (average)
|8.540/ml||388000/100 ml||1.360.000/100 ml|
|0,4/ml||5,6/100 ml||0,8/100 ml|
|factor of reduction*||4,33||4,84||6,23|
|reduction||99,9953 %||99,985 %||99,9999 %|
*factor of reduction = log10 concentration of the bacteria within the influent flow - log10 concentration of the bacteria within the outflow
For the test bacteria Enterobacter Cloacae the operation of the UV-disinfection plant PURION 1000 lead to a reduction by approx. 4 log10-steps. Therefore the bacteria have been reduced by 99,99%. Within the outflow the threshold of 100 KBE/ml regarding colony count at 36°C according to the drinking water ordinance has been met in all of the samples. The maximum value within outflow was 1 KBE/ml (within two of the samples). For three samples the value was 0/ml. Therefore concentration of bacteria has been below the detection limit.
For the test bacteria Pseudomonas Aeruginosa the operation of the UV-disinfection plant PURION 1000 lead to a reduction by approx. 5 log10-steps. Therefore for Pseudomonas Aeruginosa an average reduction by 99,9985% could be reached. Within the outflow of the UV-disinfection plant only very small counts of Pseudomonas Aeruginosa could be detected – 5,6 KBE/100 ml in average.
For the test bacteria E.Coli the operation of the UV-disinfection plant PURION 1000 lead to a reduction by approx. 6 log10-steps. Therefore for E.Coli an average reduction by 99,9999% could be reached. Within the outflow of the UV-disinfection plant within three samples only very small counts of E.Coli could be detected (1 or rather 2 KBE/100). Two of the samples have been free of E.Coli.
In general it can be attested that the UV-disinfection plant PURION 1000 was very efficient and suitable within the conducted tests. Within the test setup the bacteria have been reduced by 4 to 6 log10-steps.
For the lower bound of reduction by 4 log10-steps the colony counts for the test bacteria could be reduced below 100 KBE/ml or rather for E. coli 10000/100 ml by using the UV-disinfection plant PURION 1000. Therefore microbiological thresholds regarding drinking water ordinance have been met.
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