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|Title:||The effect of the surface-to-volume contact ratio on the biomass production potential of the pipe products in contact with drinking water|
|Authors:||TSVETANOVA Zvezdimira; HOEKSTRA Eddo|
|Citation:||WATER SCIENCE AND TECHNOLOGY vol. 10 no. 1 p. 105-112|
|Publisher:||I W A PUBLISHING|
|Type:||Articles in Journals|
|Abstract:||The biomass production potential (BPP) test is a semi-static test for assessment of the microbial growth promoting properties of construction products in contact with drinking water (CPDW) under strictly defined conditions. In 2003 the test was selected for incorporation into a scheme for acceptance of CPDW in the framework of the implementation of the European Construction Product Directive and Drinking Water Directive. The test is performed at a surface-to-volume contact ratio (S/V) of 0.166 cm-1, that is quite different from the practice in buildings and domestic installations. The goal of the study is to evaluate the importance of S/V ratio for performance of the BPP test and for correct assessment of the growth promoting properties of CPDW. The BPP of 10 pipe products were compared under the S/V ratios of 0.166 cm-1 and 1.6 cm-1. The BPP of most plastic products were higher under the S/V ratio of 1.6 cm-1 in individual trials. However, the differences of average BPP values between both ratios were statistically insignificant. The planktonic biomass concentrations showed 4-14 times stronger effect of the products on water quality at higher S/V ratio and this can be important from hygienic point of view. For acceptance of CPDW, besides a pass/fail criterion for the BPP, the planktonic biomass concentration could be taken as a second criterion for evaluation.|
|JRC Institute:||Institute for Health and Consumer Protection|
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