Treating Water With Chlorine Dioxide Reduces THMs, Improves Taste for Arkansas Water Treatment Plant

The 1.8 MGD Greenwood Water Treatment Plant was built in 1964 and upgraded in 1992. The facility provides drinking water to a population of more than 7,000 and, like many small towns, Greenwood has faced major decisions about how to remain in compliance with the Safe Drinking Water Act. Because its water supply is provided by a very shallow lake (less than 10-feet deep), sourcewater quality can vary widely. “We often get a lot of organics, and this had brought about high trihalomethanes (THMs) in our finished water when we prechlorinated,” says Greenwood Water Superintendent, Mack Cochran. THMs were running more than 115 mg/l and as high as 175 mg/l..

In addition, the high organic levels in the sourcewater were causing problems with taste and odor. In the late 1990s, Greenwood started looking for TOC reduction solution as well as improve taste and odor in its finished water.

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