City of Scottsdale Water Campus Adopted Nanocomposite RO Membranes for Indirect Potable Reuse

Transcription

1 City of Scottsdale Water Campus Adopted Nanocomposite RO Membranes for Indirect Potable Reuse Dian Tanuwidjaja AMTA/AWWA 1

2 Outline of Presentation Introduction. Thin Film Nanocomposite (TFN) Membrane Technology. Scottsdale Water Campus. Advanced Water Treatment (AWT) Facility. TFN Membrane Performance. TFN vs. Non-TFN Comparison Data. Conclusion. AMTA/AWWA 2

3 Introduction Global Water Scarcity Issue Globally half a billion population experience severe water scarcity all year round. By 2050, at least 25% of world s population is likely to live in a country affected by fresh water shortage. * The number of months per year in which water scarcity occurs 1) 1) Mesfin M. Mekonnen, and Arjen Y. Hoekstra Sci Adv 2016; 2:e AMTA/AWWA 3

4 Introduction Water Reuse in United States Texas No WQ standards for IPR, DPR permitted on case by case basis during emergency. New Mexico Both IPR and DPR are permitted on case by case basis. Florida Regulation based on applications (subsurface vs. surface). California DPH is using Regulation Related to Recycled Water based on CCR title 17 and 22. Subsurface application - direct injection. Surface application - recharge to a spreading area. Application includes Soil-Aquifer Treatment (SAT). Assume Recycled Municipal Wastewater Contribution (RWC) = 1.0 for worst case scenario. TOC limit = 0.5 mg/l/rwc= 0.5 mg/l. AMTA/AWWA 4

5 Introduction Water Reuse in Arizona Started in Grand Canyon Village MGD reuse for toilet flushing and boiler feed. In 2010 Blue Ribbon Panel (BRP) on Water Sustainability. In 2012 the Steering Committee for Arizona Potable Reuse (SCAPR). Specifically the use of reclaimed water for IPR can be implemented. In 2016 Arizona Department of Environmental Quality (ADEQ) begun revising Arizona s rules governing reuse. AMTA/AWWA 5

6 TFN Membrane Technology Core Competencies All the NanoH 2 O TM membranes are developed based on innovative Thin Film Nanocomposite (TFN) technology to improve membrane performance by incorporating benign nanoparticles. AMTA/AWWA 6

7 Scottsdale Water Campus Site Location Scottsdale Water Campus is located in Scottsdale, AZ, north east of Phoenix, AZ. AMTA/AWWA 7

8 Scottsdale Water Campus Plant History Commissioned in 1999 with initial capacity of 6 MGD. One of the first plants to use MF and RO to treat waste water effluent. Currently produce 20 MGD of treated water for ground water aquifer injection. AMTA/AWWA 8

9 Scottsdale Water Campus Treatment System Scottsdale Water Campus consists of two facilities: Water Reclamation Plant (WRP). Advanced Water Treatment (AWT) Facility. AWT treats excess effluent from WRP for groundwater aquifer recharge. Target level to meet or surpass WQ established by ADEQ. AWT Facility Flow Diagram AMTA/AWWA 9

10 Scottsdale Water Campus BWRO System Configuration Fourteen (14) 8-inch RO trains. 1 MGD per train. 20:10:5 or 24:10:5 array configuration. 6 elements per PV. 85% Recovery. Three (3) 16-inch RO trains. 2.8 MGD per train. 13:7 array configuration. 7 elements per PV. 85% Recovery. AMTA/AWWA 10

11 Scottsdale Water Campus TFN BWRO Membrane Installation AMTA/AWWA 11

12 Scottsdale Water Campus Existing Non-TFN BWRO Operation Membranes installed in Operating condition: Feed ph: Average Flux: 9.0 gfd (15.3 lmh). Feed Pressure: psi ( bars). Feed Temperature: C. AMTA/AWWA 12

13 Scottsdale Water Campus Operating Condition: Feed ph: TFN BWRO Operation Average Flux: 10.0 gfd (17.0 lmh). Feed Pressure: psi ( bars). Feed Temperature: C. During seven (7) months of operation, one CIP was performed on Train 19 only. AMTA/AWWA 13

14 TFN Membrane Performance Water Quality AMTA/AWWA 14

15 1500 TFN Membrane Performance Train 17 ppm psi C ppm 1000 Feed TDS Feed Temperature Feed Pressure Projected 45 Permeate TDS 25 Projected 5 Mar-16 Apr-16 May-16 Jun-16 Jul-16 Aug-16 Sep-16 Oct-16 Operating Date AMTA/AWWA 15

16 1500 TFN Membrane Performance Train 18 ppm psi C ppm Feed TDS Feed Temperature Feed Pressure Permeate TDS Projected Projected 5 Mar-16 Apr-16 May-16 Jun-16 Jul-16 Aug-16 Sep-16 Oct-16 Operating Date AMTA/AWWA 16

17 1500 TFN Membrane Performance Train 19 ppm C psi ppm Feed TDS Feed Temperature Feed Pressure CIP Projected Permeate TDS 25 CIP Projected 5 Mar-16 Apr-16 May-16 Jun-16 Jul-16 Aug-16 Sep-16 Oct-16 Operating Date CIP CIP AMTA/AWWA 17

18 TFN Membrane Performance Normalized Performance for Train 18 and Specific Flux Train 18 Train 19 gfd/psi % 1.5% OCWD minimum = gfd/psi CIP on Train 19 Normalized Salt Passage Train 18 Train 19 % 1.0% 0.5% CIP on Train % Apr-16 Jun-16 Jul-16 Aug-16 Operating Date Oct-16 Nov-16 AMTA/AWWA 18

19 mg/l mg/l TFN Membrane Performance TOC Data for Trains 18 and 19 Feed TOC Concentration Permeate TOC Concentration Train 18 Train mg/l of TOC per CA SAT regulations CIP on Train 19 CIP on Train Apr-16 Jun-16 Jul-16 Aug-16 Oct-16 Nov-16 Operating Date AMTA/AWWA 19

20 mg/l C TFN vs. Non-TFN RO Membranes 1,500 1,250 Feed TDS TFN Non-TFN 1, Feed Temperature TFN Non-TFN 30 psi mg/l Feed Pressure TFN Non-TFN Permeate TDS TFN Non-TFN AMTA/AWWA 20 Operating Time (days)

21 TFN vs. Non-TFN RO Membranes 1.5 Relative Specific Flux TFN Non-TFN 1 % % 0.8% Normalized Salt Passage TFN Non-TFN % 0.6% 0.4% 0.2% Operating Time (days) AMTA/AWWA 21

22 Conclusion During the stable operation of the TFN membrane in Scottsdale Water Campus for 7 months, TFN membrane shows high rejection on most ions. Permeate WQ is well within the three-year target set by Water Campus. Stable Permeate TOC concentration and well within California s 0.5 mg/l target for SAT application. The TFN membrane generally performs better than the non- TFN membrane. AMTA/AWWA 22

23 Thank You Scottsdale Water Campus Art Nunez (coauthor) Binga Talabi (coauthor) Allen Davidson Mike Helton LG Chem Hoon Hyung (coauthor) Roy Daly (coauthor) Warren Casey Eugene Rozenbaoum AMTA/AWWA 23