Brackish Groundwater Desalination Concentrate Treatment and Disposal Options

Transcription

1 EASTERN MUNICIPAL WATER DISTRICT Brackish Grundwater Desalinatin Cncentrate Treatment and Dispsal Optins Paul D. Jnes II, P.E. General Manager, EMWD February 18,

2 Overview f EMWD Established in Square-mile Service Area Ppulatin f 768,000 Serving Seven Cities and Unincrprated Areas One f 26 MWD Member Agencies High-grwth Area 11.0 t 12.6 f rain per year (4 last year). 2

3 Prducts and Services Fresh Water: 137,000 accunts 90,000 AF f Ptable Water Sales/year Imprted Water Hemet and Perris Water Filtratin Plant Menifee and Perris I Desalters Perris II Desalter (Design) Grundwater Wells Wastewater: 229,000 Accunts Fur Wastewater Treatment Plants Capacity 63 MGD Currently Treating 46 MGD Recycled Water: Furth Largest in Califrnia EMWD Treats 100 percent f Wastewater Generated 90 percent f Recycled Water is Sld fr Beneficial Reuse 3

4 Suthern Califrnia Surces f Water Sierra Nevada Muntains Bay Delta State Water Prject Lcal Supplies: Grundwater Brackish Desalinatin Recycled Water Clrad River Aqueduct Best Practices in Water Use Efficiency (Cnservatin) 4

5 EMWD s 2014 Water Supply Prtfli Imprted Water Supply frm MWD: 71,200 AF 56% Lcal Water Supply: 56,800 AF 44% 5

6 Grwth in Demands Limited Supplies EMWD s Urban Water Management Plan Based Upn 2045 Build-ut f City s and Cunty s General Plans EMWD Adpted Strategic Plan: Maintain Lng-term Balance f Imprted and Lcal Supplies Prtect and Enhance Grundwater Resurces thrugh Salinity Management Recycle 100 percent f Wastewater fr Beneficial Use T Supprt Grwth, EMWD has Cmmitted t Lcal Resurce Investments: 2045 Demands: 215,000 AF an Increase f 68 percent Expand and Transitin Recycled Water Use (Indirect Ptable) Increase Water Use Efficiency Standards Maximize Brackish Grundwater Desalinatin (New Capacity and RO Brine Recvery) 6

7 Desalinatin Prgram Brackish Desalinatin Objectives: Develp Substantial Unused Brackish Grundwater (>1,000 mg/l) Prtect Adjacent Grundwater Resurces frm Salinity Intrusin Achieve Net Salt Balance Relative t Imprted Water Supplies Utilize Available Brine Dispsal Optins and Advance Recvery Technlgies Implement Timely and Cst Effective Expansin Prjects Strategic Supply Gal: Expand Brackish Grundwater Desalinatin t Prvide ver 17,500 AF/year t Serve 35,000 Husehlds 7

8 Existing Prgram - Menifee Desalter Perris Suth Basin Feedwater pipelines 3 Prductin wells Inland Empire Brine Line Menifee Desalter - Phase I 3.1 MGD Reverse Osmsis Desalter 4,000 AF/year Prductin Operatinal in

9 Existing Prgram - Perris I Desalter Perris Suth Basin Feedwater pipelines 9 Prductin wells Inland Empire Brine Line Perris I Desalter 5.6 MGD Reverse Osmsis Desalter 7,200 AF/year Prductin Operatinal in

10 Salinity Management Prgram Overview Salinity Management 2.3 MGD f Brine Dispsal thrugh Brine Line 4.5 MGD Dispsal at Full Expansin Current Salt Remval 25,000 Tns Annually Slight Net Imprt int Regin with Imprted Water Ultimate Salt Remval Gal 55,000 Tns Annually Net Exprt 10

11 Brine Dispsal Optins EMWD Desalters Cnstructed by a Five Agency Jint Pwers Authrity Pipeline is 70 miles lng Capacity is 32.6 MGD Supprts Six Desalters and Industrial Dischargers Including EMWD s Perris and Menifee Desalters EMWD has 5.9 MGD Pipeline Capacity and is currently using abut 2.3 MGD Cst fr O&M $1.05M/year Cst fr Pipeline Capacity ~ $3.75M/MG Cst fr Treatment and Dispsal Capacity ~ $8.6M/MG 11

12 Why Cnsider Brine Recvery? Increasing Csts f Brine Dispsal: currently $1.05 millin/year. Single Brine Dispsal Optin and Limited Facility Capacity. Lss f Valuable Water Resurce: Presently - 2,500 AF/year Future - 4,000 AF/year Reliability and Brine Dispsal System Redundancy. 12

13 GE AquaSel Brine Treatment Technlgy Pilt Ptentially capable f imprving brackish desalting verall recvery efficiency frm 75 percent t abut 98 percent. Prven brine cncentratin technlgy used in bttling industry. Public/Private partnership with General Electric. Public Agency Participatin: Secured Metrplitan Water District s Fundatinal Actin funding grant ($192,000) Bureau f Reclamatin technical peer review and pilt prgram supprt ($132,000) 13

14 GE AquaSel Uses Electrdialysis Reversal (EDR) and a precipitatr 14

15 Cst Estimates fr 2.3 MGD AquaSel Plant Descriptin Prjected Cst Chemicals $ 795,000 Sludge Dispsal $ 319,700 Electricity $2,028,000 SAWPA Dispsal $ 96,500 Other O&M (Membrane Replacement, etc.) $ 324,000 Ttal Annual O&M $3,563,200 Annual Capital Csts * $ 752,000 Ttal Annual Capital and Operating Csts $4,315,200 Overall Recvery 98 percent Recvered Water 2,400 AF/year Cst per AF fr Recvered Water $ 1,801 Avided Annual Dispsal Csts $ 958,500 Net Cst per AF f Recvered Water $ 1,403 +/- * Assumes $13 millin capital amrtized at 4% 15

16 AquaSel Pilt Prgress Update Nvember 30, First day f peratins prcessing RO cncentrate. December 3, Inlet pressure t EDR system increased frm 27 t 44 psi due t cllidal silica fuling. December 16, Tests were perfrmed n RO brine t find a pre-treatment r peratinal methd t limit silica scale. February 3, Pilt unit was placed back in peratin with additin f ferric chlride, multimedia, and cartridge filter. Operating with RO cncentrate recvery f 93 percent achieved - verall desalter recvery f 98 percent 16

17 Prgress Update (cnt d) 17

18 Summary and Cnclusins Summary f EMWD Brackish Water Desalinatin Prgram Creates Lcal Ptable Water Surce t Meet Grwth Will Prvide ver 17,500 AF/year t Serve 35,000 Husehlds Reduces Dependence n Imprted Water Is Cst Effective and Cmpetitive with Alternative Supplies Meets Reginal Salinity Management and Offset Objectives Prtects Grundwater Basins frm brackish water intrusin Sustains Recycled Water Prgram thrugh Surce Water Salinity Reductin 18

19 Summary and Cnclusins (cnt d) Summary f Brine Minimizatin and Recvery Pilt GE Aquasel Success achieving RO cncentrate recvery f 93 percent. Initial fuling f EDR caused by high silica levels. Silica issue was successfully mitigated using multi-media, cartridge filter, and Ferric Chlride (FeCl 3 ). Over 100 hurs f pilt peratin and data cllectin. Next Steps: Increase run times and cntinue t mnitr system perfrmance (remval efficiency, cleaning cycles, etc.). USBR peer review and ther technical analysis f the data. Validate perating cst data (electrical, chemical, etc.) 19

20 Schedule Pilt Evaluatin/Mnitring and Sampling Analysis On-ging On-ging USBR Peer Review 5/31/2015 Decmmissining 7/15/2015 Data Evaluatin and Final Prject Reprt Publicatin 12/31/

21 EASTERN MUNICIPAL WATER DISTRICT Cntact Infrmatin Paul D. Jnes, II, P.E. General Manager PO Bx Trumble Rad Perris, Califrnia (951) , extensin