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THE COLORADO BASINROUNDTABLE <br />G/a pD ?a.?.?.?.24 <br />????aa? ?s????s, ?oLO?o <br />s??o? <br />July 3, 2008 <br />Todd Doherty <br />Interstate water Nianagem.ent Development Section <br />Colorado water Conservation Board <br />1550 Logan Street, Suite 600 <br />Denver, Colorado 80203 <br />fie: water Supply ?.eserve Account 2ooS Grant Application for the Colorado <br />Department of Public Health and Environment water Quality Control <br />Division Zero Liquid Discharge Study <br />Dear Todd: <br />This letter constitutes a letter of support from the Colorado River Basin Roundtable for <br />the "Demonstration of .Zero Liquid Discharge process for Drin?ang water Systems" grant <br />request made through other Roundtables. The support from voting members was 19-4. <br />Drinking water providers increasingly have to make use of lower quality water sources <br />and in many cases have turned to membrane treatment, which is a recognized technology <br />that can treat these waters to meet ar surpass most water quality objectives. Disposal of <br />the waste stream ?concentrate? from membrane treatment systems is often the critical <br />issue. Uptions far discharging concentrate from d??.nking water systems that serve the <br />most populated areas of the state, or systems treating impaired sources, is very limited <br />and zero liquid discharge ??ZLD} of concentrate might be a long-term solution.:?xisting <br />ZLD technology, however, is energy intensive, relatively costly and has not been <br />demonstrated on a broad scale or for large systems. <br />This is a proj ect of statewide importance as it will generate .information that will assist <br />municipal drinking water utilities in implementing membrane treatment projects. <br />Implementation of this project will develop important cost and operating data for ZLD <br />technologies likely to be implemented in Calorado. <br />S' c rely, `_ <br />7' Pokrandt <br />air, Colorado Basin Roundtable