Joint Water Purification Project- Colorado's First Planned Indirect ...

Statoi’s view on possibilities and process of aN-DK connectionSept 2010Dan Jarle Flølo - Statoil1 -Classification: Internal 2010-09-10Classification: Internal 2010-09-08Classification: Internal 2010-09-06

Alluvial / Indirect Potable ReuseWater Quality IssuesWater Quality ConcernsMicrobialRe-growthin Wastewater

• Original Project Goals:Project Goals– Provide treatment for the alluvial watersupply, thereby protecting its long termusability– Long-term implementation of IndirectPotable Reuse to the extent possible– Provide an appropriate level oftreatment that would have publicsupport– Maximize use of renewable alluvialsupply– Address aesthetic concerns→ Many of these are policy level decisions

Technical and Institutional Issues• Development in a high end commercial park• Fouling of RO membranes due towastewater colloidal particles• Treatment of RO brine to removephosphorus and other permit requirements• Impacts of waste streams to the sewersystem• Accumulation of salts in the alluvium due toRO brine discharge• Challenges in developing the raw watersystem, including yield and locating wellswith acceptable water quality for membranesSignificant capital andO&M costs are realized forthe RO brine treatmentsystem

Comparison of SystemConfigurationsAdvancedWastewaterTreatmentAdvancedWater TreatmentCustomersCalifornia IPR SystemsAlluvial/AquiferDischarge andTreatmentAdvancedWastewaterTreatmentAdvancedWater TreatmentCustomersACWWA/CWSD havelittle control overother WW dischargesand urban runoffAlluvial/AquiferDischarge andTreatmentJoint Water Purification Project

Potable Treatment ConfigurationWaterQualityMonitoring RO Skids OxidationReactors(UV/H2O2)AirStrippersAdvancedWastewaterTreatmentAlluvialFiltration/6 monthTravel TimeClearwell/Disinfection

Plant Multiple Barrier ConceptsTREATMENTPROCESSPathogens/MicrobialCONTAMINANTS OF CONCERNInorganic Radionuclides OrganicsTOC VOC/SOC EmergingAlluvialFiltrationReverseOsmosisX 1 X 1 X 1 X 1X X X 2 X X 3 X 3AdvancedXOxidationAir Strippers X 4 X 5XChemicalDisinfectionX1. Will generally remove organics except volatiles with MW < 200-3002. Will remove radionuclides with the exception of radon gas3. Will remove light volatile organics4. Will remove radon gas only

Construction Cost SummaryITEMCOSTBid Package 1-$27,500,000Water Treatment PlantPotable Treatment Processes $23,000,000Concentrate Treatment System $4,500,000Bid Package 2-$3,500,000PipelinesBid Package 3-$2,000,000Raw Water Supply WellsTOTAL $33,000,000

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