AWWA ACE61807

Cast iron and ductile iron pipes are in use in water distribution systems throughout the U.S. andin Europe. Iron metal (Fe(0)) and the Fe(II) produced during corrosion of iron are potentreductants that have been shown to promote the reduction of a wide variety of halogenatedorganic chemicals. Thus, batch experiments were performed to investigate the degradation of awide variety of disinfection byproducts (DBPs) in the presence of Fe(0), iron minerals containingFe(II), and Fe(II) sorbed onto iron oxide surfaces. Most DBPs tested were completelydehalogenated in the presence of Fe(0) to non-toxic endproducts. As expected, degradationrates in the presence of Fe(II) minerals (e.g., magnetite) and sorbed Fe(II) were slower thanwith Fe(0). The effects of a competing oxidant such as dissolved oxygen were mixed, as thedegradation rates of rapidly degraded (i.e. mass transfer limited degradation) compounds wereunaffected while a lag phase was observed for slower reacting (i.e. surface reaction limited)compounds. The results of this research suggest that abiotic degradation may play a role in thefate of DBPs in distribution systems and also suggests a possible treatment strategy for DBPremoval from water supplies. Includes 7 references, table, figures.

Product Details

Edition:

Vol. - No.

Published:

06/17/2005

Number of Pages:

5

File Size:

1 file , 530 KB