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Feasibility Evaluation of the Arkansas Valley Pipeline <br />Waterworks! Committee <br />June 2003 <br />The CDPHE, however, is reviewing their policy and regulations concerning RO reject with <br />the likelihood of not allowing future disposal directly into surface waters. Based on currently <br />available information, requirements for future RO reject disposal are still under consideration <br />by CDPHE. Further information from CDPHE concerning the possible requirements for RO <br />reject disposal and a schedule for developing these requirements is unavailable. <br />This section presents the results of analysis of alternatives for disposal of the RO reject and <br />the costs of theses alternatives for inclusion with the cost of water treatment for the No <br />Action option. <br />3.4.5.1 Disposal Alternatives <br />The following is a list of possible alternatives for disposal of RO reject other than direct <br />discharge to a stream: <br />Reduce RO recovery rate to maintain concentration levels in RO reject that can be <br />accepted by a conventional WWTP. <br />2. Evaporation and landfill disposal of RO reject sludge. <br />3. Deep well injection. <br />4. Use RO reject as industrial/mining water supply. <br />5. Vapor compression and crystallization (essentially an industrial forced evaporation <br />process). <br />6. Irrigation/land disposal in areas vegetated by salt tolerant species. <br />7. Ocean disposal. <br />Reduce RO Recovery Rates <br />This alternative would reduce RO recovery rates to RO reject concentration levels that can be <br />accepted by a conventional WWTP or can be directly discharged to a stream. Brown & <br />Caldwell believes this maybe the procedure currently used by the City of Las Animas with <br />respect to their RO reject. The City is reportedly operating its RO plant at approximately 50 <br />percent recovery that may be a factor in CDPHE allowing discharge of the RO reject tot the <br />Purgatoire River. <br />38 <br />GEI Consultants, InC. 01284 03-06-30 Feasibility Evaluation Final <br />