Saving Energy and Water. Working with High Recovery Water Treatment Plants

Transcription

1 Saving Energy and Water Working with High Recovery Water Treatment Plants >

2 Saving Energy and Water Working with High Recovery Treatment Plants

3 Reverse Osmosis - Benefits o Reliable and Consistent Technology o Easy Operation & Maintenance o Treated Water Meets Potable Quality Standards o Membrane is a Physical Barrier o High Salt Rejection (> 98%) o Effective at Removing Emerging Compounds 3

4 Reverse Osmosis - Limitations o Brine Management o 75% Typical o Salinity o Sustainability o Rising Energy Costs o Need Energy-Efficient Systems o RO-Centered Systems Often Utilize Less Energy Than Other Technologies o Scaling & Fouling Limit Efficiency and Recovery o >50% of cost = pretreatment SDI 15 < 3 o Capital and Operation Costs Considered Expensive Need for Economical High-Recovery Water Systems 4

5 Brine Management o Evaporation Ponds o Large Land Area o Capital Intensive Construction, Liners o Arid Climates Only o Deep Well Injection o o o o o Often Difficult To Permit High Pumping and Monitoring Costs May Contaminate Water Supplies and Deteriorate Soil Quality Limitations on Area Recourses Raise Disposal Well Bids Hauling o Expensive o Sewer Disposal o o Salt Accumulation Issue Reaches Downstream Treatment Facilities Zero Liquid Discharge (Evaporator/Crystallizer) o Capital and Operation Cost Intensive

6 High Recovery RO Plant To optimize overall plant recovery that include all stages of plant treatment; pre treatment, reverse osmosis and reject water recovery. TITRE PRÉSENTATION / SOUS TITRE / DATE 6

7 Pre Treatment Optimization Use of compact & efficient clarification units Minimize backwash of filters and recover backwash water Reduce the potential of RO scaling and fouling and hence increase the recovery by having reliable pre treatment. TITRE PRÉSENTATION / SOUS TITRE / DATE 7

8 RO Optimization Reverse osmosis optimization; Using naval design technique employing state of the art membranes. Reject water recovery; Use another step of reverse osmosis Reduce the potential of another step of RO scaling and fouling by treating the feed water Evaporation (ZLD) TITRE PRÉSENTATION / SOUS TITRE / DATE 8

9 High Recovery RO Near ZLD ZLD Brine Flow Rate 1000s GPD Current Practice Advanced Recovery Brine TDS 1000s mg/l % 75% 80% 85% 90% 95% 100% Membrane System Recovery Brine Flow Rate Brine Concentration

10 High Recovery RO Primary RO Advanced Recovery Brine Recovery (2 nd RO) Permeate Brine Ca, Mg SO 4 Si Filtration Add. Conc. Near ZLD Brine Concentrator Crystallizer Ba, Sr ZLD TOC Brine Line Land Application

11 OPUS TITRE PRÉSENTATION / SOUS TITRE / DATE 11

12 OPUS TITRE PRÉSENTATION / SOUS TITRE / DATE 12

13 OPUS II TITRE PRÉSENTATION / SOUS TITRE / DATE 13

14 OPUS II TITRE PRÉSENTATION / SOUS TITRE / DATE 14

15 Case Study; Soften the brine Parameter Unit Calcium, Ca mg/l 300 Magnesium, Mg mg/l 110 Sodium, Na mg/l 745 Potassium, K mg/l 32 Ammonium, NH 4 mg/l - Barium, Ba mg/l - Strontium, Sr mg/l - Boron, B mg/l - Carbonate, CO 3 mg/l 0.1 Bicarbonate, HCO 3 mg/l 200 Sulphate, SO 4 mg/l 590 Chloride, Cl mg/l Fluoride,F mg/l - Nitrate, NO 3 mg/l 16.5 Phosphate,PO 4 (Total) mg/l - Silica, SiO 2 mg/l 24 Iron, Fe (Total) mg/l - Manganese, Mn mg/l - Total Dissolved Solids (TDS) mg/l ph 7 Temperature o F TOC mg/l - COD mg/l - BOD mg/l - SDI - Challenges: - Brine Disposal - Silica Precipitation - Conventional Approach: 75% RO recovery (75 m3/d reject) - HRO Approach: 92% Overall recovery (25 m3/d reject) - Lime Ca(OH)3: 3.4 ton/day - Soda Ash: Na2Co3: 8 ton/day - Sludge: 11.5 ton/day TITRE PRÉSENTATION / SOUS TITRE / DATE 15

16 Case Study; Soften the brine TITRE PRÉSENTATION / SOUS TITRE / DATE 16

17 Case Study; Soften the brine Flow r at e m 3/ h Flow r at e m 3/ h Flow r at e m 3/ h Flow r at e m 3/ h Flow r at e m 3/ h Flow r at e m 3/ h TDS m g/ L Har dness f Sulf at es m g/ L Silic a m g/ L ph Flow r at e m 3/ h Flow r at e m 3/ h TDS m g/ L Har dness f Sulf at es m g/ L Silica m g/ L ph Flow r at e m 3/ h TDS m g/ L Har dness f Sulf at es m g/ L Silic a m g/ L ph Flow r at e m 3/ h TDS m g/ L Har dness f Sulf at es m g/ L Silic a m g/ L ph Flow r at e m 3/ h TDS m g/ L ph Flow r at e m 3/ h Flow r at e m 3/ h Flow r at e m 3/ h Flow r at e m 3/ h Flow r at e m 3/ h Flow r at e m 3/ h Flow r at e m 3/ h TDS m g/ L Har dness f 5 Flow r at e m 3/ h ph Sulf at es m g/ L Har dness f Silic a m g/ L TDS m g/ L TSS m g/ L 11 Flow r at e m 3/ h Sulf at es m g/ L Silic a m g/ L ph Flow r at e m 3/ h Flow r at e m 3/ h 12 TITRE PRÉSENTATION / SOUS TITRE / DATE 17

18 Case Study; Soften / Seed the brine Parameter Unit Concentration Calcium ppm 1101 Magnesium ppm 111 Sodium ppm 618 Potassium ppm 71 Bicarbonate ppm 170 Sulfate ppm 3187 Chloride ppm 835 ph 7.6 Challenge: - Water conservation - High recovery - No treatment: 50% recovery - With Softening : 83% Overall recovery - Lime Ca(OH)3: 3.1 ton/day - Soda Ash: Na2Co3: 50 ton / day - Sludge: 51 ton /day - With Precipitation: 78% Overall recovery - No Chemicals TDS ppm 6133 COD ppm 148 BOD ppm <2 TSS ppm 150 TITRE PRÉSENTATION / SOUS TITRE / DATE 18

19 Case Study; Soften / Seed the brine 85% Recover y RO Sof t ener 90% Rec. UF Flow r at e m 3/ ph Conduct ivit y us/ cm TSS m g/ Calcium m g/ Bicar bonat es m g/ Car bonat es m g/ Sulf at es m g/ TDS m g/ Flow r at e m 3/ ph Conduct ivit y us/ cm TSS m g/ Calcium m g/ Bicar bonat es m g/ Car bonat es m g/ Sulf at es m g/ TDS m g/ Flow r at e m 3/ ph Conduct ivit y us/ cm TSS m g/ Calcium m g/ Bic ar bonat es m g/ Car bonat es m g/ Sulf at es m g/ TDS m g/ Flow r at e m 3/ ph Conduct ivit y us/ cm TSS m g/ Calcium m g/ Bic ar bonat es m g/ Car bonat es m g/ Sulf at es m g/ TDS m g/ Flow r at e m 3/ ph Conduct ivit y us/ cm TSS m g/ Calcium m g/ Bic ar bonat es m g/ Car bonat es m g/ Sulf at es m g/ TDS m g/ Flow r at e m 3/ ph Conduct ivit y us/ cm TSS m g/ Calcium m g/ Bic ar bonat es m g/ Car bonat es m g/ Sulf at es m g/ TDS m g/ Flow r at e m 3/ ph Conduct ivit y us/ cm TSS m g/ Calcium m g/ Bic ar bonat es m g/ Car bonat es m g/ Sulf at es m g/ TDS m g/ Flow r at e m 3/ ph Conduct ivit y us/ cm TSS m g/ Calcium m g/ Bic ar bonat es m g/ Car bonat es m g/ Sulf at es m g/ TDS m g/ Flow r at e m 3/ ph Conduct ivit y us/ cm TSS m g/ Calcium m g/ Bicar bonat es m g/ Car bonat es m g/ Sulf at es m g/ TDS m g/ Flow r at e m 3/ ph Conduct ivit y us/ cm TSS m g/ Calcium m g/ Bicar bonat es m g/ Car bonat es m g/ Sulf at es m g/ TDS m g/ Direction or Department name 19

20 Case Study; Soften / Seed the brine 65% Recover y RO CaSO 4 desat ur at or 90% Rec. UF Flow r at e m 3/ ph Conduct ivit y us/ cm TSS m g/ Calcium m g/ Bicar bonat es m g/ Car bonat es m g/ Sulf at es m g/ TDS m g/ Flow r at e m 3/ ph Conduct ivit y us/ cm TSS m g/ Calcium m g/ Bicar bonat es m g/ Car bonat es m g/ Sulf at es m g/ TDS m g/ Flow r at e m 3/ ph Conduct ivit y us/ cm TSS m g/ Calcium m g/ Bicar bonat es m g/ Car bonat es m g/ Sulf at es m g/ TDS m g/ Flow r at e m 3/ ph Conduct ivit y us/ cm TSS m g/ Calcium m g/ Bicar bonat es m g/ Car bonat es m g/ Sulf at es m g/ TDS m g/ Flow r at e m 3/ ph Conduct ivit y us/ cm TSS m g/ Calcium m g/ Bic ar bonat es m g/ Car bonat es m g/ Sulf at es m g/ TDS m g/ Flow r at e m 3/ ph Conduct ivit y us/ cm TSS m g/ Calcium m g/ Bicar bonat es m g/ Car bonat es m g/ Sulf at es m g/ TDS m g/ Flow r at e m 3/ ph Conduct ivit y us/ cm TSS m g/ Calcium m g/ Bicar bonat es m g/ Car bonat es m g/ Sulf at es m g/ TDS m g/ Flow r at e m 3/ ph Conduct ivit y us/ cm TSS m g/ Calcium m g/ Bicar bonat es m g/ Car bonat es m g/ Sulf at es m g/ TDS m g/ Flow r at e m 3/ ph Conduct ivit y us/ cm TSS m g/ Calcium m g/ Bicar bonat es m g/ Car bonat es m g/ Sulf at es m g/ TDS m g/ Flow r at e m 3/ ph Conduct ivit y us/ cm TSS m g/ Calcium m g/ Bicar bonat es m g/ Car bonat es m g/ Sulf at es m g/ TDS m g/ Flow r at e m 3/ ph Conduct ivit y us/ cm TSS m g/ Calcium m g/ Bicar bonat es m g/ Car bonat es m g/ Sulf at es m g/ TDS m g/ Flow r at e m 3/ ph Conduct ivit y us/ cm TSS m g/ Calcium m g/ Bicar bonat es m g/ Car bonat es m g/ Sulf at es m g/ TDS m g/ TITRE PRÉSENTATION / SOUS TITRE / DATE 20

21 ZDD Technology o What is ZDD? o Zero Discharge Desalination o Proprietary Brackish Water Desalination Technology US Patent 7,459,088 Electrodialysis Metathesis (EDM) Kidney that removes salts from an RO concentrate stream

22 TITRE PRÉSENTATION / SOUS TITRE / DATE 22

23 Conventional Electrodialysis

24 Electrodialysis Metathesis (EDM)

25 ZDD Configurations o Diminishing Supply o Conservation of depleting water source 25

26 ZDD Configurations o Increase Water Production o Maximize yield for increased demand 26

27 27 ZDD Modes of Operation Basic Mode of Operation No existing RO; Low TDS / Silica required in Product

28 28 ZDD Modes of Operation Concentrate Recovery Mode Existing RO; Low TDS / Silica required in Product

29 ZDD Case Study Alamogordo, New Mexico Direction or Department name 29

30 ZDD Case Study Alamogordo, New Mexico Direction or Department name 30

31 ZDD Evolution System Recovery 100% 2% 95% 90% 85% 80% 75% 70% Conventional BWRO BWRO+EDM w/purge BWRO+EDM w/antiscalant BWRO+EDM w/silica removal BWRO+EDM w/silica removal, projected dewatering NF+EDM w/antiscalant

32 ZDD Demonstration Unit (EDM)

33 33 ZDD Case Study Alamogordo, New Mexico Evaporation Pond Sizing Evaporation rate of 22.8 cm/month (average) per NOAA Softening & High Recovery 90% 231 gpm concentrate 42 acres 94% 150 gpm concentrate 24 acres Conventional 72% would require 147 acres

34 Questions? TITRE PRÉSENTATION / SOUS TITRE / DATE 34