AWWA QTC97179

The presence of biofilm in drinking water distribution systems and the sloughing off of bacteria is a source of drinking water contamination and a major cause of non compliance with coliform regulations. One of the major biofilm control strategies is the use of biocides, mainly chlorine and chloramines. However, it is well documented that bacteria in biofilms may survive in the presence of high chlorine residuals. The resistance mechanisms of biofilm to chlorination are not well understood but may be both passive (diffusion-controlled) and active (reaction-controlled). The presence of extracellular polymeric substances (EPS) is often identified as the major cause of resistance. The objective of this study was to examine the impact of chlorination on the composition of EPS. More specifically, the presence of carbohydrates and amino acids was monitored in an attempt to gain insight into the mechanisms of resistance of biofilms to disinfection.

Product Details

Published:

01/01/1997

ISBN(s):

0898679583

Number of Pages:

13

File Size:

1 file , 150 KB