AWWA WQTC62485

Recent studies originating from this laboratory and the Newport NewsWater Works has confirmed the bacterial degradation of various disinfection byproducts(DBPs) in drinking water. This bacterial degradation appears to be common in areas of thedistribution system that have low levels of residual chlorine and high heterotrophicbacterial levels. Two specific bacteria have been identified that are capable of degrading avariety of haloacetic acids (HAAs) and other DBPs using a specific halodehalogenaseenzyme. These bacteria have been cultured in the laboratory and identified as aBurkholderia and Sphingomonas species. A rather effective and relatively simplecolorimetric method has been developed which is able to detect the release of HCl or HBrfrom the HAAs during the enzymatic degradation. Using this colorimetric method theauthors have been able to examine the speciation of the enzymatic degradation andselectivity of the two bacteria for various HAAs and haloacetonitriles (HANs). Thiscolorimetric method could be very adaptable to future laboratory procedures involving thedetection of bacterial species capable of HAA degradation in a particular distributionsystem. This method could be useful to those laboratories involved in the selection andmonitoring for the future IDSE requirement for stage 2 of the disinfection byproduct rule. Includes 15 references, tables, figures.

Product Details

Edition:

Vol. - No.

Published:

11/01/2005

Number of Pages:

13

File Size:

1 file , 360 KB