Seawater desalination with Lewabrane LPT, 2016

Transcription

1 Seawater desalination with Lewabrane LPT, 2016

2 Seawater desalination with Lewabrane Topic 1. Why seawater desalination with RO Topic 2. RO membranes for different seawater qualities Topic 3. Different configurations in seawater applications Topic 4. Reference plant in Egypt 2

3 Seawater desalination with Lewabrane Topic 1. Why seawater desalination with RO Topic 2. RO membranes for different seawater qualities Topic 3. Different configurations in seawater applications Topic 4. Reference plant in Egypt 3

4 Water elixir of life 97% of the world s available water is salt water......only 3% is fresh water. Less than 1% of the world s water is available for human use 4

5 Why RO for seawater desalination because it is efficient SW desalination with RO is extremely energy efficient Around 2-3 kwh/m 3 is used while thermodynamic calculation are predicting around 1.5 kwh/m 3 This is less then 25% of the energy which was necessary 25 years ago The improvement has been achieved by Improvement of the RO membrane Improvement of surface area of spiral wound elements Using ultrafiltration as pretreatment Implementation of energy recovery devices New configuration to save investment and operational costs 5

6 Seawater desalination with Lewabrane Topic 1. Why seawater desalination with RO Topic 2. RO membranes for different seawater qualities Topic 3. Different configurations in seawater applications Topic 4. Reference plant in Egypt 6

7 Lewabrane offers two different SW elements HF and HR S HF Type S HR Type Salt rejection 99.8% 99.8% Ave. flux 400/440 ft /37.5 m 3 /d 24.6/27.3 m 3 /d Boron rejection 99.2% 99.3% Max. pressure 83 bar 83 bar Max. temperature 45 C 45 C Test conditions: 55.2bar (800 psi), mg/l NaCl (or when tested with Boron additional 5 mg/l Boron), Temp. 25 C (77 F) and 8% recovery rate 7

8 Due to different SW qualities and temperature regions prefer HF or HR type Mainly four different regions for SW 1. Atlantic/Pacific TDS: ~ ppm Temperature: 5 30 C (China 5 C, Florida 30 C) 2. Mediterranean TDS: ppm Temperature: C 3. Arabian Gulf TDS: ppm Temperature: C 4. Red Sea TDS: ppm Temperature: C Regional overview of different S-Types HF/HR HF-Type HR-Type HF/HR HF-Type 8

9 Seawater desalination with Lewabrane Topic 1. Why seawater desalination with RO Topic 2. RO membranes for different seawater qualities Topic 3. Different configuration in seawater applications Topic 4. Reference plant in Egypt 9

10 Single pass systems achieve the WHO drinking water standard at low investment costs Most single pass plants consist of one stage The number of elements per vessel is in the order of 6 8 The recovery rate is in the order of 45-55% High rejection membranes are used to achieve the needed permeate quality A Boron level below 2.4 mg/l can be achieved by a single pass system This systems are common in the Middle East Although the single pass configuration is the oldest one in SW it is still sufficient if standard water quality is needed. 10

11 Double pass systems are bigger but they achieve a very low Boron level Double pass system consist of a single stage in pass 1 and two stages in pass 2 The number of elements per vessel is in the order of 6 8 The recovery rate is in the order of 45-55% pass 1 and up to 95% in pass 2 While in pass 1 S-HF types are used in pass 2 standard brackish water or LE can be installed. Using only S-HF in pass 1 the non balanced workload of the first elements may lead to strong fouling. Therefore hybrid configurations are used. After pass 1 the ph may increased to enhance the Boron rejection The double pass system may have several kind of configurations like: Concentrate recirculation from pass 2 to pass 1 or pass 2 Permeate blending of pass 2 Split partial configuration Hybrid configuration 11

12 Split partial reduces the feed to pass 2 and therefore the size of the system Conventional double pass Split partial system Most of the permeate of pass 1 are treated in pass 2 Depending on the water quality some permeate pass1 is used for blending The low salinity permeate of the first elements in pass 1 is used for blending. Since this water quality is better compared to the conventional part more permeate for blending can be used. Therefore the size of pass 2 can be reduced. 12

13 A standard installation has a constant tendency for flux and permeate TDS Calculated operational pressure: 64 bar 13

14 Hybrid system is combination of HR/HF with higher permeate TDS but a lower energy consumption HR HR HR HF HF HF HF Calculated operational pressure: 62 bar 14

15 Both discussed configurations lead to lower energy consumption with minor disadvantages Hybrid system The system has an equal workload of the elements. The rejection is lower therefore a second pass is needed. The pressure is lower compared to an standard installation with HR. Split partial Less investment since less vessels and elements are needed in pass 2. Less energy demand (5-10%) since less water has to be treated in pass 2. The lead element in pass 1 may perish faster. The handling during installation is more difficult. More elements have to be in stock. 15

16 LewaPlus TM offers the possibility to calculate split partial and hybrid system 1. Different element types in one vessel This is done to reduce the energy consumption and the fouling tendency. 2. Elements with different ages Compensating performances loss by new elements. 3. Customized unit system The user can select the units he wants to work with including bar. Hybrid configuration for elements 16

17 Seawater desalination with Lewabrane Topic 1. Why seawater desalination with RO Topic 2. RO membranes for different seawater qualities Topic 3. Different configuration in seawater applications Topic 4. Reference plant in Egypt 17

18 Lewabrane first seawater tests in Egypt one year ago Sharm El-Sheik, Sinai, Egypt Local water utility since m³/d freshwater production for municipal usage > µs/cm feed water water source beach well Start spring, 2014 Location 18

19 Field test successfully started Integrity and stability tests Promising first days of operation Experts at the plant of the DME (Deutsche Meerwasser Entsalzung GmbH) confirmed high rejection and very high productivity 19

20 Lewabrane around 100,000 elements are installed worldwide in Europe, America 20

21 Asia/Pacific. They are running in different applications and water types. 21

22 Lewabrane has a comparable innovative product portfolio Cross-reference list based on data sheet values 22

23 Summary Lewabrane RO elements Lewabrane goes to the beach Lewabrane offers two different types of SW elements for different water qualities for different configurations LewaPlus calculation and design software can be used to optimize the investment and operational costs of a system. Membrane and elements made in Germany 23

24 Safe harbor statement Health and Safety Information: Appropriate literature has been assembled which provides information concerning the health and safety precautions that must be observed when handling the LANXESS products mentioned in this publication. For materials mentioned which are not LANXESS products, appropriate industrial hygiene and other safety precautions recommended by their manufacturers should be followed. Before working with any of these products, you must read and become familiar with the available information on their hazards, proper use and handling. This cannot be overemphasized. Information is available in several forms, e.g., material safety data sheets, product information and product labels. Consult your LANXESS representative in Germany or contact the Regulatory Affairs and Product Safety Department of LANXESS Deutschland GmbH or - for business in the USA - the LANXESS Corporation Product Safety and Regulatory Affairs Department in Pittsburgh, PA, USA. Regulatory Compliance Information: Some of the end uses of the products described in this publication must comply with applicable regulations, such as the FDA, BfR, NSF, USDA, and CPSC. If you have any questions on the regulatory status of these products, contact for business in the USA-, the LANXESS Corporation Regulatory Affairs and Product Safety Department in Pittsburgh, PA, USA or for business outside US the Regulatory Affairs and Product Safety Department of LANXESS Deutschland GmbH in Germany. The manner in which you use and the purpose to which you put and utilize our products, technical assistance and information (whether verbal, written or by way of production evaluations), including any suggested formulations and recommendations are beyond our control. Therefore, it is imperative that you test our products, technical assistance and information to determine to your own satisfaction whether they are suitable for your intended uses and applications. This application-specific analysis must at least include testing to determine suitability from a technical as well as health, safety, and environmental standpoint. Such testing has not necessarily been done by us. Unless we otherwise agree in writing, all products are sold strictly pursuant to the terms of our standard conditions of sale. All information and technical assistance is given without warranty or guarantee and is subject to change without notice. It is expressly understood and agreed that you assume and hereby expressly release us from all liability, in tort, contract or otherwise, incurred in connection with the use of our products, technical assistance, and information. Any statement or recommendation not contained herein is unauthorized and shall not bind us. Nothing herein shall be construed as a recommendation to use any product in conflict with patents covering any material or its use. No license is implied or in fact granted under the claims of any patent. 24

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26 Water info room 26

27 LANXESS is working on novel feed spacer designs to lower the energy consumption Computational fluid dynamics simulation for a feed spacer Correlation 27

28 Energy recovery devices like the turbocharger use the concentrate pressure to boost the feed Example: turbocharger adds here 22 bar to the feed pressure Q f = 124 m 3 /hr P m = 48 bar Q f = 124 m 3 /hr P m = 70 bar Q f = 62 m 3 /hr P m = 67 bar Q f = 62 m 3 /hr P m = 0,3 bar Q f = 62 m 3 /hr P m = 0,5 bar Pressure and flow rate influence the pressure boost P = T ef R cf (P c P e ) P pressure boost T ef turbocharger efficiency R cf ratio of concentrate to feed flow (or interstage flow) P c concentrate pressure at the RO unit exit P e concentrate pressure at the turbocharger exit 28