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<br />. <br />. <br />. <br />. <br />. <br />~ <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br /> <br />Artificial Recharge of Ground Water in Colorado <br />A Statewide Assessment <br /> <br />Manal!e/Mitil!ate Water Oualitv <br />Physical, chemical, and biological processes in an aquifer have the potential for modifying water <br />quality. AR can take advantage of these natural processes, through soil/aquifer treatment <br />(Figure Ill-5), to improve water quality of the water supply in the following situations: <br /> <br />. Improvement of surface-water quality - AR can be used when surface water requires <br />a level of treatment prior to utilization. Bacterial digestion and physical-chemical <br />processes (geo-purification) in an aquifer can act as a natural treatment facility. <br />Surface water may contain high levels of suspended or dissolved solids that must be <br />removed before the water can be placed to beneficial use. AR mitigation is <br />accomplished by capturing the runoff for recharge infiltration and geo-purification . <br />through an aquifer. The water is then recovered from the aquifer some distance away <br />from the active channel through wells or infiltration galleries and put to beneficial <br />use. <br /> <br />. Improvement of ground-water quality - AR can be used to improve ground-water <br />quality. High quality surface water can be recharged to an aquifer where the ambient <br />ground-water quality is impaired by naturally occurring dissolved solids, producing a <br />lens of higher quality water. Recovered water is of higher quality than the ambient <br />ground water. <br /> <br />. Disinfection byproducts (DB?) reduction - Chlorination of water can produce <br />elevated concentrations ofDBP's (trihalomethane compounds: chloroform, <br />bromoform, dichlorobromomethane, and dibromochloromethane). Treated drinking <br />water can be used as the source water for AR. Dilution and geo-purification in the <br />aquifer will reduce the DBP concentrations in the recovered water. <br /> <br /> <br />. Wastewater disposal- In this situation, treated wastewater is allowed to infiltrate as <br />an alternative to discharging to surface water. This option typically requires less <br />treatment, therefore less expense for wastewater disposal. <br /> <br />11 <br />