Full Description

Chloramination is popular in drinking water treatment because it can provide microbial controlbut unlike chlorination it results in much less formation of disinfection byproducts (DBPs) suchas trihalomethanes (THMs) and haloacetic acids (HAAs). Unfortunately, nitrification indrinking water distribution systems is a widespread issue when chloramination is employed as aresidual disinfection process. Nitrification is undesirable because the disinfectant residual can belost and re-growth of bacteria may occur. Nitrification is a well understood process whereammonia-oxidizing bacteria (AOB) oxidize ammonia into nitrite (NOsub2/subsup-/sup), which is then convertedto nitrate (NOsub3/subsup-/sup) by nitrite-oxidizing bacteria (NOB). Recent research has shown that AOB areable to biodegrade THMs through an enzymatic process known as cometabolism. Thecometabolism byproducts are highly reactive substances thought to be capable of eitherdamaging or killing AOB. The objective of this research is to determine whether THMs play a significantrole in preventing water distribution system nitrification. Includes 11 references, tables, figures.

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Edition: Vol. - No. Published: 06/01/2007 Number of Pages: 56File Size: 1 file , 1.4 MB