Washington City, Utah, located in the far southwest corner of Utah, installed a 3 MGD water treatment plant in 2003. Given the challenge that the Quail Creek reservoir presented, a membrane unit was selected by Washington City as the primary treatment process.

The membrane unit, although effective in removing pathogens and TDS, was not effective in removing the unpleasant taste and odor from the water. The taste and odor issues are often seasonal and are directly related to weather events that introduce organic contaminants to the water source, specifically MIB and geosmin.

Granular Activated Carbon

Although not a health risk, taste and odor are of primary importance to potable water consumers. The city chose Tonka Equipment Companyfs Granular Activated Carbon (GAC) contact vessels to treat the taste and odor issues.

Each contact vessel offers over nine minutes of empty bed contact time (EBCT), giving the GAC media sufficient interaction with the water to remove the offensive organic particles. Since the vessels were designed to sit outside, it was desirable to minimize footprint and maximize height. To accomplish this, two 12Œ diameter vessels were used, each with a 16Œ side shell height to accommodate 12 vertical feet of GAC.

High Quality Water

Providing the best potable water to its customers is always the primary goal of Tonka Equipment Company and the treatment systems we recommend.