1. Brine Concentration Pilot Project (AquaSel) Update
Khos Ghaderi, P.E.
Director of Water Operations
June 17, 2015

2. Overview Generated Brine Volume: Loss of Valuable Water Resources:
Menifee Desalter MGD
Perris Desalter MGD
2.3 MGD
Loss of Valuable Water Resources:
Presently – 2,500 AF/year
Future – 4,000 AF/year
Goals:
Maximize available water resources
Reduce costs
Improve reliability

3. Evaluation of Emerging Technologies
Uses Gypsum Crystals to prevent salt precipitation on membrane surfaces
Large footprint high TDS product
60% recovery
SPARRO
Seeded Slurry
SAL-Proc
GE Processors Inc.
Recovers by-products
(gypsum, magnesium hydroxide, etc.) for marketing
Low flux
No manufacturers
65% recovery
Membrane
Distillation
(MD)
Passage of water vapor through the membrane
Good for lower TDS brine
80% recovery
Forward Osmosis
(FO)
Uses chemical potential to draw water through the membrane
Bench scale testing by University of Nevada, Reno
Zero Discharge Desalination (ZDD)
Use Electrodialysis Metathesis (EDM)
Developed by Dr. Davis of UTEP
Uses Electrodialysis Reversal (EDR) and Precipitator
AquaSel
Ongoing pilot testing

4. AquaSel Pilot Evaluation Objectives
Demonstrate ability to reliably treat EMWD’s brine
Provide for a higher percentage of brine recovery
Verify and validate preliminary cost estimates
Identify any operational and maintenance issues
Develop appropriate treatment train design for a demonstration scale plant based on findings

5. Impact of Recovery on Brine Concentration33 97 25 96 95 20
Level of difficulty increases exponentially at higher brine concentrations 90 10
Concentration
Factor
6.7 85 5 80 75 4 2 1 50
Percent Recovery

6. AquaSel Pilot Progress Update
November 30, First full day of operations processing RO concentrate
December 3, 2014 to February 3, 2015
Experienced several operations and water quality related issues
Silica fouling
Calcium carbonate fouling (scaling)
Modified and tested treatment train to address hydraulic and membrane fouling issues
February 3, Pilot unit was placed back in operation with addition of pre-treatment (ferric chloride, multimedia, and cartridge filter)
April 13, Achieved steady state operations
Continued experiencing occasional starts and stops due to scale formation on the membranes

7. AquaSel Pilot Progress Update (cont’d)
Phase I – 97 Percent Overall Recovery
507 hours of operation
Desalters at 71 percent recovery
AquaSel at 90 percent recovery
Occasional fouling of the EDR membranes
Product water quality high in TDS (3,000 mg/L)
Phase II – 95 Percent Overall Recovery
200 hours of operation
Desalters at 75 percent recovery
AquaSel at 80 percent recovery
Product water quality varied but achieved 1,500 mg/L TDS
Operation was less reliable than Phase I and required additional maintenance
Transitioning to EMWD staff’s operating the pilot unit

8. Comparison of Desalter Recovery Rates

9. Replaced Anion Membranes
Performance Overview
Replaced Anion Membranes
IEBL
Shutdown
Power Outages
Adjusted Recovery

10. Summary of Testing to Date
Membrane fouling and hydraulic issues were mitigated
Promising operational performance
1,300 hours of operation
320 hours of continuous run time
Stable operation since April 13, 2015 with occasional downtime
Overall brine recovery of 95 percent has been achieved

11. Additional Evaluation Under Phase II Conditions 7/30/2015
Next Steps
Additional Evaluation Under
Phase II Conditions /30/2015
Continue pilot testing at 95 percent recovery
Verify and validate cost estimates
Evaluate water quality and reliability
Complete Draft Project Report /31/2015
Peer review by USBR and MWD
Complete Final Project Report /15/2015

12. Recommendations
Extend testing through July 30, 2015 to obtain additional data and improve water quality
Approve and authorize the following:
Amend the AquaSel™ pilot rental agreement with GE Water & Process Technologies for an additional $35,000, for a total contract cost not-to- exceed $187,000;
Amend Contract Number with Carollo Engineers for brine management technical support for an additional $55,000, for a total contract cost not-to-exceed $150,000; and
Additional appropriation of $90,000 for the AquaSel™ Brine Concentration Pilot Study, which brings the total estimated project cost to $512,508.

13. Khos Ghaderi, P.E.
Director of Water Operations
(951) , extension 6240