City of Brady Water Treatment Plant

CLIENT: City of Brady

As a part of the City of Brady’s (City) Radium Reduction Project, eHT also directed to evaluate and resolve ongoing disinfection byproduct (DBP) formation issues associated with the City’s existing surface water treatment plant (WTP). To address the City’s noncompliant radionuclide levels in its groundwater supply, the City implemented the construction of a surface WTP (consisting of brackish surface water desalination through the use of membrane filtration and reverse osmosis) to treat and blend surface water from Lake Brady with the City’s groundwater to gain compliance for radionuclides. However, the exceedingly high radionuclide levels in many of the City’s wells prevented blending from being an effective compliance solution. Furthermore, Lake Brady has high total organic carbon (TOC) levels and extremely high alkalinity, which prevented the use of pretreatment technologies to effectively reduce TOC. Given the high amount of TOC left in the finished water from the City’s WTP, even the use of weak oxidant disinfectants (such as chloramine) can still result in noncompliant DBP levels in the distribution system.

As a part of the treatment portion of improvements at the City’s WTP, eHT designed both groundwater treatment improvements to directly reduce radionuclides in the City’s groundwater and surface water treatment improvements to significantly reduce TOC in the finished water from the WTP prior to disinfection to reduce DBP formation to maintain compliance with DBP requirements in distribution. Completion of the treatment improvements allowed the City to operate either under treated groundwater, treated surface water or a blend of treated groundwater and surface water as needed depending on seasonal conditions in the City’s water supplies.