AWWA WQTC65944

Direct application of low levels of chlorite is a very effective way to control nitrification in the distribution system. However, before chlorite can be fully utilized as a nitrification inhibitor, the effects of important water quality parameters on chlorite decay must be determined. This study examined variables individually which include pH, initial chlorite concentration, temperature, dissolved organic carbon (DOC), and chloramine. Results obtained from batch experiments indicate that chlorite itself is stable in buffered water with pH from 7 to 9, temperature from 15 to 35 ºC, and in the presence of 1 to 3 mg/L of DOC from different sources. On the other hand, significant chlorite decay was observed in the presence of chloramine. Includes 24 references, tables, figures.