cache creek wtf presentation
TRANSCRIPT
Your Water – Locally Produced!
Jason M. Brabec, P.E.
Innovative Recycled Water Desalination for the Cache Creek Casino Resort
HYDROSCIENCE ENGINEERS INC.
WateReuse California Annual Section Conference 2010
Background
PROJECT LOCATION
Cache Creek Casino ResortBrooks, California
WASTEWATER EFFLUENT QUALITY
Recycled water meets Title 22 Criteria (Unrestricted Use)
PARAMETER EFFLUENT AVERAGE
Flow 230,000 gpd
Peak Treatment Capacity 475,000 gpd
Chlorine Residual 1-5 mg/L
Turbidity 0.10 NTU
RECYCLED WATER DISTRIBUTION
• Toilet flushing within the Resort• Decorative water features• Landscape site irrigation• Yocha Dehe Golf Course irrigation
SITE WATER CYCLE
1.1 MG
WELLS
RW
RESORT / FACILITIES
WWTP
18
GOLFCOURSE
WATER FEATURES
CACHE CREEK
LANDSCAPEIRRIGATION
Water Quality Impacts
SOURCE GROUNDWATER
• Elevated levels of TDS• High hardness
ION EXCHANGE SOFTENER
1.1 MG
WELLS
RW
RESORT / FACILITIES
WWTP
18
GOLFCOURSE
WATER FEATURES
CACHE CREEK
LANDSCAPEIRRIGATION
WATERSOFTENERS
NaCl
RECYCLED WATER QUALITY IMPACTS
Significantly Impacted Recycled Water Effluent Quality
WATER SOURCES TDSmg/L
Sodiummg/L
Chloridemg/L
Hardnessgrains
Groundwater (source water) 539 81 113 17.5
Potable water supply after ion-exchange 717 183 107 0-1
Recycled water effluent 1,582 491 630 NA
IMPACTS OF HIGH SALTS
• Reduced irrigation suitability• Significant dilution required to comply with WDR
discharge limits• Increased maintenance of toilet flushing valves• Aesthetic issues
Development of Solutions
GOALS & OBJECTIVES
• Provide soft water• Suitable recycled water quality for irrigation
purposes• Comply with WDR• Minimize distribution system maintenance• Maximize water reuse• Maintain environmental stewardship
BRINE DISPOSAL
• Ocean discharge• Deep well injection• Discharge to other municipality• Crystalizer
• Off-haul for disposal
ALTERNATIVES
A) Off haul ion-exchange regeneration brineB) Desalinate recycled waterC) Desalinate potable water
ALTERNATIVE A
1.1 MG
WELLS
RW
RESORT / FACILITIES
WWTP
18
GOLFCOURSE
WATER FEATURES
CACHE CREEK
LANDSCAPEIRRIGATION
WATERSOFTENERS
NaCl
OFF-HAULBRINE DISPOSAL
ALTERNATIVE B
1.1 MG
WELLS
RW
RESORT / FACILITIES
WWTP
18
GOLFCOURSE
WATER FEATURES
CACHE CREEK
LANDSCAPEIRRIGATION
WATERSOFTENERS
NaCl
DESALINATIONBRINE
DISPOSAL
ALTERNATIVE C
1.1 MG
WELLS
RW
RESORT / FACILITIES
WWTP
18
GOLFCOURSE
WATER FEATURES
CACHE CREEK
LANDSCAPEIRRIGATION
OFF-HAULBRINE DISPOSAL
POTABLEWATERDESALINATION
WATERSOFTENERS
NaCl
THE WINNER!
OTHER DESIGN CONSIDERATIONS
• Site constraints – topography
• Out of sight from patrons
• Two-step brine concentrationprocess(due to brine off-haul)
Water Desalination Treatment Facility
FIRST STEP: DESAL AND SOFTENING
• Elevated silica levels in source ground water• High recovery rates
ElectrodialysisReversal (EDR)Selected
EDR TECHNOLOGY
Cl_
Na+
Na+
Cl _
Cl_
Cl_
Na+
ANODE (+)FEED PRODUCT
BLOWDOWN(WASTE)
CATHODE (-)
Cl_
Cl_
Na+
Na+
CONCENTRATEMAKEUP
CONCENTRATERECYCLE
RECYCLE PUMP
C
A
C
A
C
A
C
SOU
RC
E: G
E
SECOND STEP: BRINE CONCENTRATION
• Clarifier and pH conditioning• Elevated silica levels in EDR reject• Piloted Vibratory Shear Enhanced
Process (VSEP) system
VSEP selected for 2nd stage
VSEP TECHNOLOGY
SOU
RC
E: N
EW L
OG
IC R
ESEA
RCH
EDR TREATMENT PROCESS
EDR PUMPS BLEND TANK AND TREATMENT TRAINS
VSEP FEED TANK VSEP FILTER PACKS
VSEP TREATMENT PROCESS
BRINECONCENTRATION
CHEMICAL HANDLING FACILITY
CHEMICAL LOADING AREACHEMICALS
WDTF DESIGN CAPACITY
Parameter Capacity DescriptionAvg. Daily Softening Production Capacity 650,000 GPD Finished Water
(< 3 grain hardness)
Reject Concentration 125,000 GPD Reject Treatment
Brine Generation 20,000 GPD Brine Concentrate
Building 8,500 sq-ft Process area, lab, chemical room, MCC
RECYCLED WATER QUALITY IMPACTS
Water Source TDS(mg/L)
Sodium(mg/L)
Chloride(mg/L)
Groundwater (Source Water) 539 81 113
Potable Water (EDR Finish Water) 195 39 53
Recycled Water Effluent 545 (1,582) 146 (491) 159 (630)
Percent Reduction (2007 vs 2009) 66% 70% 75%
WDTF RECOVERY RATE
System PercentRecovery
Electrodialysis Reversal System 85%
VSEP System 85%
Water Desalination Treatment Facility 97%
POTENTIAL IMPROVEMENTS
• Increase recovery of EDR• Evaluate waste streams• Conditioning of VSEP feed
Conclusion
GOALS & OBJECTIVES - Revisited
Provide soft water Suitable recycled water for irrigationComply with WDRMinimize distribution system maintenanceMaximize water reuseEnvironmental stewardship
Jason M. Brabec, P.E.10569 Old Placerville Road
Sacramento, CA 95827916-364-1490
HydroScience Engineers