Closed-Circuit Desalination

Transcription

1 Closed-Circuit Desalination Instructors David Paul Dr. Rick Stover David H. Paul, Inc. Desalitech, Inc.

2 Today s Webinar 40 minute presentation David gives Intro Rick gives details 20 minutes of Q & A Type your questions into the Questions box

3 Today s Webinar This presentation is recorded Will be available at: You ll be sent a Thank You with a PDF of this presentation

4 Today s Webinar David H. Paul, Inc. and Desalitech, Inc. do not have a financial relationship This webinar is presented to give the water treatment industry information on a relatively new technology for water and wastewater minimization

5 Instructor David Paul, President, David H. Paul, Inc. Working with RO water systems since 1977 Training and consulting at hundreds of plant since 1988 Master of Science Degree in Microbiology

6 Instructor Rick Stover, Executive VP, Desalitech, Inc. 25 years of commercial and technical experience Holds several patents on desalination methods and devices PhD in Chemical Engineering

7 Conventional RO Units Getting high recovery from a conventional RO unit presents challenges including: Typically requires 3 or 4 stages for > 85% recovery or concentrate recovery RO unit(s) High first element water flux Higher fouling rate Pressure drop across elements Higher pressure requirement for more elements per pressure vessel Low crossflow velocities Higher fouling potential Higher scaling potential

8 Conventional RO: High Fouling Design Average gfd = 13.7 (Average lmh = 23.3) 21.5 (36.6) 3.8 (6.5) Brackish Water

9 Options to Reduce Fouling of 1 st Elements Hybrid Elements First Stage Permeate Backpressure Interstage Booster Pump

10 Hybrid Elements Average gfd = 13.7 (Average lmh = 23.3) 16.5 (28.0) 8.8 (15.0) 16.5 (28.0) 8.8 (15.0) Brackish Water

11 Permeate Back Pressure Average gfd = 13.7 (Average lmh = 23.3) 16.5 (28.0) 8.8 (15.0) 16.5 (28.0) 8.8 (15.0) Brackish Water

12 Interstage Pump Average gfd = 13.7 (Average lmh = 23.3) 16.5 (28.0) 8.8 (15.0) 16.5 (28.0) 8.8 (15.0) Brackish Water

13 CCD TM Unique features One stage no matter how high the recovery Semi-batch mode Periods of 100% recovery followed by dumps of concentrate (also called brine or reject) Only 3-4 membrane elements per pressure vessel Variable, controlled crossflow rate Variable, controlled recovery rate

14 BWRO (High Recovery) CCD TM Closed Circuit (CC) 3-Way Valve High Pressure Feed Pump Circulation Pump Plug Flow (PF) = Brine Dump 3-Way Valve High Pressure Feed Pump Circulation Pump

15 SWRO (Low Recovery) CCD TM Recirculation High Pressure Feed Pump Circulation Pump Feed Water Brine Replacement Pump Side Conduit

16 SWRO (Low Recovery) CCD TM Brine Dump/Refill High Pressure Feed Pump Circulation Pump Brine Replacement Pump Side Conduit

17 SWRO (Low Recovery) CCD TM Brine Discharge High Pressure Feed Pump Circulation Pump Brine Replacement Pump Side Conduit

18 Instructor Rick Stover, Executive VP, Desalitech, Inc. 25 years of commercial and technical experience Holds several patents on desalination methods and devices PhD in Chemical Engineering

19 Nov 2015 High Efficiency Water Treatment

20 The world is running out of conventional water supplies

21 Industrial water consumption is 60% of fresh water withdrawals. Expected to increase 5x by 2050.

22 Mission High efficiency water treatment is the inevitable future Desalitech s mission is to be the global leader of: High efficiency water purification and reuse New sustainable sources of reliable and affordable water

23 Value Proposition 95% recovery, 75% Reduction of Water Waste 35% Less Energy Use Increased Reliability thru Reduced Fouling and Scaling New Level Of Flexibility

24 Water Technology Companies M&A by LG

25 Brackish and Industrial RO 75% Recovery $/1000gal 93% Recovery $/1000gal CAPEX $0.17 3% $0.17 Energy $0.13 3% $0.13 O&M $0.38 7% $0.38 Brine + xs Feed $ % $1.04 Total $ % $1.72 Greater than 67% Reduction in Total Cost of Ownership. $1.1M / Y in Savings. ROI in Several Months. Present value costs for typical 600 gpm (3,3000 m 3 /d) industrial RO Unit for 10 years. GWI s 2015 US average $1.56 /m3 water and $2.1/m3 brine = $13.86/1000gal. Energy price of $0.1/kWh and 0.35 kwh/m3 or $13.2 kwh/1000gal.

26 Case Studies Case Studies Ingredient water purification 450 gpm at 95% water recovery Saves 65M gallons a year $1M annual savings ROI under 6 months Industrial wastewater reuse 50 gpm at 90% recovery Saves $3M in disposal costs ROI within 2 month

27 2014 Select Systems Installed Built / Systems Installed Power Generation Car Manufacturer Food Manufacturer Cosmetics Pulp and Paper Chocolate Producers Mobile Units Oil & Gas

28 Technology Technology Cross flow Reverse Osmosis (RO) is the global standard water purification method. 60 years of slow evolution led to a technological plateau. 10

29 Technology Technology Simple Filtration Permeate flow equals feed flow Dirt flushed or filters changed periodically. Unlimited recovery No cross flow = not suitable for RO 11

30 Technology Technology Traditional Reverse Osmosis Pump or Permeate Throttle Between Stages Fouling of Lead Elements Scaling of Tail Elements Multiple stages are required for > 50% recovery, however Multiple stages mean cost, complexity, inflexibility Unbalanced operation causes fouling, scaling and lower recovery. 12

31 ReFlex Reverse Osmosis The first major improvement in the RO process in decades. Up to 98% recovery in a single stage, depending on water chemistry. Fouling/scaling limited by x-flow and cycling Recovery, cross flow and flux independent, set at control panel. 13

32 Fouling Resistance Sanitation Districts of Los Angeles County Side by side study of Desalitech CCD vs traditional RO, 93% recovery. Tertiary effluent fouls traditional RO quickly and permanently. CCD RO resists fouling with high cross flow and good flux distribution. 14

33 Scaling Resistance ppm -Silica in Concentrate 1, Figure-4: Maximum Pressure vs Silica in Concentrate 10.1 gfd (17.2 lmh) 11.5 gfd (19.6 lmh) Record high silica concentrations in membrane reject. Normal limit is 250 ppm. Frequent flushing prevents scaling psi - Maximum Pressure 15

34 Energy Savings CCD RO feed pressure curve hugs osmotic pressure curve. Energy consumption low as multi-staged RO, without the complexity. Energy consumption close to thermodynamic minimum. 16

35 Seawater RO and Brine Concentration $/1,000 gal State of the Art 1% Higher CAPEX 5% Lower Energy CAPEX $ % $0.67 Energy $ % $2.30 O&M $ % $1.52 Total $ % $ MGD (38,000 m3/d) Seawater RO Plant for 25 Years The Biggest Cost of Seawater Desalination is Energy. Investments in equipment that save energy are usually worth it. Present Value Costs for typical 10 MGD (38,000 m3/d) Seawater RO Plant for 25 Years

36 ReFlex Max Reverse Osmosis High pressure applications like seawater desalination and brine concentration. Brine displaced from RO system with pre-pressurized feed from side conduit. Recovery rates: 40-98%. Pressures up to 1200 psi / 83 bar.

37 ReFlex Max Reverse Osmosis

38 Energy Savings CCD RO feed pressure curve hugs osmotic pressure curve. Energy consumption low as multi-staged RO, without the complexity. Energy consumption close to thermodynamic minimum. 20

39 Next Generation Membranes Low Permeability High Permeability Use of high permeability membranes is limited by high lead element flux. Internal staging or hybrid elements distributes flux but costs energy. Short arrays get full benefit of high permeability membranes. 21

40 Record Low Energy Consumption Measured specific energy: 1.91 kwh/m 3 (7.2 kwh/kgal), 15 degc (59 degf) 47% recovery 9.2 lmh (6 gfd) flux 35,000 ppm feed 518 ppm permeate Normalize to 25 degree C (77 F): 1.45 kwh/m 3 (5.5 kwh/kgal) Large-scale state-of-the-art SWRO plants consume 2.2 to 3.0 kwh/m 3 (8-11 kwh/kgal) under similar conditions. 22

41 Summary Use of unconventional water resources and increased efficiency are inevitable. Desalitech s breakthrough RO saves 60% of total costs. 95% recovery = 75% reduced water waste and waste generation. 35% lower energy consumption. Increased reliability and flexibility. Standard products: 50 1,200 gpm units. Traction with Fortune 500 companies and top global water firms. Headquarters and manufacturing in the USA. Desalitech is emerging as the global leader in high efficiency water treatment.

42 High Efficiency Water Treatment Rick Stover, Ph.D.

43 Q & A