CalDesal Conference Desalination Today for Water Tomorrow

Transcription

1 EASTERN MUNICIPAL WATER DISTRICT CalDesal Cnference Desalinatin Tday fr Water Tmrrw Paul D. Jnes II, P.E. General Manager, EMWD Octber 1,

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 Ptable Water: 138,000 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 Fully develped pressurized distributin system with 5,721 af f seasnal strage Currently 100 percent f Recycled Water is delivered fr Beneficial Reuse 3

4 EMWD s 2014 Water Supply Prtfli Imprted Water Supply frm MWD: 71,200 AF 56% Untreated SWP and CRA Water 17% Clrad River Water (CRA) 33% Wells 13% Recycled Water 28% Bay Delta Water (SWP) 4% Desalinatin 4% Lcal Water Supply: 56,800 AF 44% 4

5 Desalinatin Prgram Brackish Desalinatin Objectives: Develp Substantial Unused Brackish Grundwater (>1,000 mg/l) Prtect Adjacent Grundwater Sub-basins 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 5

6 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

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

8 Prpsed Perris II Desalter Phase I Treatment Facility 3.5 MGD with RO (expansin up t 5.4 MGD) Prductin Facilities fur wells with cmbined capacity f 3,000 gpm Desalter feed pipeline expansin Brine dispsal cnnectin t Inland Empire Brine Line statin Phase I Csts: Capital - $59.8 millin (less $12.1 millin in state/fed grants) Operating - $2.59 millin/year 8

9 Brackish Desalinatin Supply Csts $2,500 $2,014 - $2,257 $ per acre ft f water $2,000 $1,500 $1,000 $500 $0 $923 - $1,055 Imprted water frm MWD $250 Grundwater Wells $1,015 - $1,235 Desalinated Grundwater $401 $1,200 - $1,400 Recycled Water Ocean Desalinatin Indirect Ptable Reuse Current EMWD Supplies Alternative Supplies 9

10 Salinity Management Prgram Overview Salinity Management 2.3 MGD f Brine Dispsal thrugh the Inland Empire 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 Net Salt Balance Salinity Management Imprted Water (Average Year) SWP = 46,900 af/yr (66%) 250 mg/l r 680 lbs/af = CRA = 24,000 af/yr (33%) 520 mg/l r 1,360 lbs/af = Current Desalting and Brine Discharges EMWD Menifee and Perris I Desalters MGD brine Other industrial dischargers Intl Rectifier MGD (30,000 mg/l) Inland Empire Energy MGD (6,000 mg/l) 15,900 t/y 16,400 t/y 32,300 t/y 25,000 t/y 2,300 t/y 1,800 t/y 29,100 t/y Imprted Supply Salt (TDS mg/l) Lbs. f salt/acre ft Clrad River Water ~500 t 700 mg/l 1,360 t 1,900 lbs/af State Water prject (current) ~250 mg/l 680 lbs/af 11

12 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 12

13 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. 13

14 GE AquaSel Brine Treatment Technlgy Pilt EDR and Prprietary Precipitatr - Prven brine cncentratin technlgy used in bttling industry Ptentially capable f imprving brackish desalting verall recvery efficiency frm 72 percent t a range f 94 t 98 percent. 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) 14

15 Summary f Testing Placed in peratin Nvember 30, first day f peratins prcessing RO cncentrate Membrane fuling and hydraulic issues Silica and calcium carbnate fuling (scaling) Prmising peratinal perfrmance: 1,730 hurs f peratin 320 hurs f cntinuus run time Cnsistent peratin since April 13, 2015 with ccasinal dwntime Decmmissined August 3, 2015 Overall stable brine recvery f 95 percent achieved

16 Cnceptual Csts fr 2.3 MGD AquaSel Plant Descriptin Prjected Cst Chemicals $ 795,000 Sludge Dispsal $ 320,000 Electricity $2,028,000 SAWPA Dispsal $ 97,000 Other O&M (Membrane Replacement, etc.) $ 324,000 Ttal Annual O&M $3,563,00 Annual Capital Csts * $ 752,000 Ttal Annual Capital and Operating Csts $4,315,000 Overall Recvery 95 percent Recvered Water 2,135 AF/year Cst per AF fr Recvered Water $ 2,021 Avided Annual Dispsal Csts $ 959,000 Net Cst per AF f Recvered Water $ 1,572 +/- * Assumes $13 millin capital amrtized at 4%; all prject perating csts preliminary prjectins and subject t verificatin. 16

17 Brackish Desalinatin Supply Csts $2,500 $2,014 - $2,257 $ per acre ft f water $2,000 $1,500 $1,000 $500 $0 $923 - $1,055 Imprted water frm MWD GE AquaSel Brine Treatment (Est.) $250 Grundwater Wells $1,015 - $1,235 Desalinated Grundwater $401 $1,275 - $1,500 Recycled Water Ocean Desalinatin Indirect Ptable Reuse Current EMWD Supplies Alternative Supplies 17

18 Summary Desalinatin Prgram 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 Brine Recvery Summary f Brine Minimizatin and Recvery Pilt GE AquaSel Success achieving verall brackish water recvery f 95 percent. Initial fuling f EDR caused by high silica levels. Silica issue was substantially mitigated using multi-media cartridge filter, and Ferric Chlride (FeCl 3 ). Next Steps: Review data cllected n system perfrmance (remval efficiency, cleaning cycles, silica and calcium carbnate fuling, etc.). Cmplete draft prject reprt Octber 2015 USBR and MWD peer review f data Validate perating cst data (electrical, chemical, etc.), determine scalability and finalize prject reprt January

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