Journal
WATER RESEARCH
Volume 34, Issue 6, Pages 1952-1956Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0043-1354(99)00307-3
Keywords
drinking water; fixed bacteria; pipe material; PVC; cement; iron
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Densities of fixed bacterial biomass were measured on different pipe materials (PVC, PE, cemented steel, asbestos-cement, cemented cast iron, tarred steel and grey iron) incubated in drinking waters from different sources (ground waters and a surface water) which had different characteristics (temperature, concentration of residual oxidant and content of biodegradable organic matter). Results showed that the densities of bacterial biomass fixed on plastic-based materials (PE and PVC) were the lowest. Densities of bacterial biomass fixed on gray iron were from 10 to 45 times higher than those measured on plastic-based materials. Cement-based materials had intermediate values. Pairs of cement and PVC coupons were incubated at 15 different locations in a distribution system, and there was a strong correlation between the amount of fixed bacterial biomass on these coupons, with the cement containing 2.6 times more biomass. (C) 2000 Elsevier Science Ltd. All rights reserved.
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