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Ramezani M, Ellis SN, Riabtseva A, Cunningham MF, Jessop PG. CO 2-Responsive Low Molecular Weight Polymer with High Osmotic Pressure as a Draw Solute for Forward Osmosis. ACS OMEGA 2023; 8:49259-49269. [PMID: 38162778 PMCID: PMC10753694 DOI: 10.1021/acsomega.3c07644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/02/2023] [Revised: 11/17/2023] [Accepted: 11/23/2023] [Indexed: 01/03/2024]
Abstract
A key challenge in the development of forward osmosis (FO) technology is to identify a suitable draw solute that can generate a large osmotic pressure with favorable water flux while being easy to recover after the FO process with a minimum of energy expenditure. While the CO2- and thermo-responsive linear poly(N,N-dimethylallylamine) polymer (l-PDMAAm) has been reported as a promising draw agent for forward osmosis desalination, the draw solutions sufficiently concentrated to have high osmotic pressure were too viscous to be usable in industrial operations. We now compare the viscosities and osmotic pressures of solutions of these polymers at low and high molecular weights and with/without branching. The best combination of high osmotic pressures with low viscosity can be obtained by using low molecular weights rather than branching. Aqueous solutions of the synthesized polymer showed a high osmotic pressure of 170 bar under CO2 (πCO2) at 50 wt% loading, generating a high water flux against NaCl feed solutions in the FO process. Under air, however, the same polymer showed a low osmotic pressure and a cloud point between 26 and 33 °C (depending on concentration), which facilitates the recovery of the polymer after it has been used as a draw agent in the FO process upon removal of CO2 from the system.
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Affiliation(s)
- Maedeh Ramezani
- Department
of Chemistry, Queen’s University, Kingston, ON K7L 3N6,Canada
- Department
of Chemical Engineering, Queen’s
University, Kingston, ON K7L 3N6,Canada
| | - Sarah N. Ellis
- Department
of Chemistry, Queen’s University, Kingston, ON K7L 3N6,Canada
| | - Anna Riabtseva
- Department
of Chemistry, Queen’s University, Kingston, ON K7L 3N6,Canada
- Department
of Chemical Engineering, Queen’s
University, Kingston, ON K7L 3N6,Canada
| | | | - Philip G. Jessop
- Department
of Chemistry, Queen’s University, Kingston, ON K7L 3N6,Canada
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Reddy AS, Wanjari VP, Singh SP. Design, synthesis, and application of thermally responsive draw solutes for sustainable forward osmosis desalination: A review. CHEMOSPHERE 2023; 317:137790. [PMID: 36626951 DOI: 10.1016/j.chemosphere.2023.137790] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Revised: 01/03/2023] [Accepted: 01/06/2023] [Indexed: 06/17/2023]
Abstract
Forward osmosis (FO) is an emerging sustainable desalination technology; however, it is not a stand-alone process and requires an additional step to recover the water or regenerate the draw solute (DS), making it energy extensive. Therefore, incorporating inexpensive energy sources for DS regeneration is a viable solution to compete with reverse osmosis desalination technology. Hence, selecting suitable DS and its regeneration became a crucial research focus in FO desalination. Among various DSs reported, thermally responsive DSs (TRDS) provide an opportunity to integrate low-grade energy sources for DS regeneration. Utilizing such inexpensive energy will reduce fossil fuel energy demand, lower the cost of desalination, and minimize the carbon footprint. Hence, this review explores the TRDS for FO-based desalination with its design, synthesis, and applications. The manuscript has discussed the classification and selection criteria for the DSs, and how traditional and new-generation TRDSs are designed and synthesized from cationic and anionic moieties of ionic liquids, hydrogels, and other chemicals. The manuscript has also given importance to design criteria such as osmotic strength, viscosity, toxicity, and thermal stability for TRDSs. Furthermore, a detailed discussion on the FO performance, energy, and economic aspects of TRDSs has been reviewed, along with a discussion on the possible low-grade energy sources for the recovery of TRDS. Finally, the challenges and future directions for TRDSs have been discussed to drive FO toward sustainable desalination technology.
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Affiliation(s)
- A Sudharshan Reddy
- Environmental Science and Engineering Department (ESED), Indian Institute of Technology Bombay, Mumbai 400076, India
| | - Vikram P Wanjari
- Centre for Research in Nanotechnology & Science (CRNTS), Indian Institute of Technology Bombay, Mumbai 400076, India
| | - Swatantra P Singh
- Environmental Science and Engineering Department (ESED), Indian Institute of Technology Bombay, Mumbai 400076, India; Centre for Research in Nanotechnology & Science (CRNTS), Indian Institute of Technology Bombay, Mumbai 400076, India; Interdisciplinary Program in Climate Studies, Indian Institute of Technology Bombay, Mumbai 400076, India.
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Tian M, Ma T, Goh K, Pei Z, Chong JY, Wang YN. Forward Osmosis Membranes: The Significant Roles of Selective Layer. MEMBRANES 2022; 12:membranes12100955. [PMID: 36295714 PMCID: PMC9607867 DOI: 10.3390/membranes12100955] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Revised: 09/17/2022] [Accepted: 09/22/2022] [Indexed: 06/02/2023]
Abstract
Forward osmosis (FO) is a promising separation technology to overcome the challenges of pressure-driven membrane processes. The FO process has demonstrated profound advantages in treating feeds with high salinity and viscosity in applications such as brine treatment and food processing. This review discusses the advancement of FO membranes and the key membrane properties that are important in real applications. The membrane substrates have been the focus of the majority of FO membrane studies to reduce internal concentration polarization. However, the separation layer is critical in selecting the suitable FO membranes as the feed solute rejection and draw solute back diffusion are important considerations in designing large-scale FO processes. In this review, emphasis is placed on developing FO membrane selective layers with a high selectivity. The effects of porous FO substrates in synthesizing high-performance polyamide selective layer and strategies to overcome the substrate constraints are discussed. The role of interlayer in selective layer synthesis and the benefits of nanomaterial incorporation will also be reviewed.
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Affiliation(s)
- Miao Tian
- School of Ecology and Environment, Northwestern Polytechnical University, Xi’an 710072, China
| | - Tao Ma
- School of Ecology and Environment, Northwestern Polytechnical University, Xi’an 710072, China
| | - Kunli Goh
- Singapore Membrane Technology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore
| | - Zhiqiang Pei
- Beijing Origin Water Membrane Technology Co., Ltd., Beijing 101417, China
| | - Jeng Yi Chong
- Singapore Membrane Technology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore
| | - Yi-Ning Wang
- Singapore Membrane Technology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore
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Wu S, An Y, Lu J, Yu Q, He Z. EDTA-Na 2 as a recoverable draw solute for water extraction in forward osmosis. ENVIRONMENTAL RESEARCH 2022; 205:112521. [PMID: 34902380 DOI: 10.1016/j.envres.2021.112521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2021] [Revised: 12/02/2021] [Accepted: 12/03/2021] [Indexed: 06/14/2023]
Abstract
Regeneration and reuse of draw solute (DS) is a key challenge in the application of forward osmosis (FO) technologies. Herein, EDTA-Na2 was studied as a recoverable DS for water extraction by taking advantages of its pH-responsive property. The FO system using EDTA DS achieved a higher water flux of 2.22 ± 0.06 L m-2 h-1 and a significantly lower reverse salt flux (RSF) of 0.06 ± 0.01 g m-2 h-1, compared to that with NaCl DS having either the same DS concentration or the same Na+ concentration. The suitable pH range for the application of EDTA DS was between 4.0 and 10.5. A simple recovery method via combined pH adjustment and microfiltration was employed to recover EDTA DS and could achieve the recovery efficiency (at pH 2) of 96.26 ± 0.48%, 97.13 ± 1.03% and 98.56 ± 1.40% by using H2SO4, H3PO4 and HCl, respectively. The lowest acid cost for DS recovery was estimated from 0.0012 ± 0.0001 to 0.0162 ± 0.0003 $ g-1 by using H2SO4. The recovered EDTA DS could be reused in the subsequent FO operation and the overall recovery efficiency was 94.4% for four reuse cycles. These results have demonstrated the feasible of EDTA-Na2 DS and a potentially cost-effective recovery approach, and encouraged further exploration of using EDTA-based compounds as a draw solute for FO applications.
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Affiliation(s)
- Simiao Wu
- College of Food Science and Engineering, Nanjing University of Finance and Economics, Nanjing, Jiangsu, 210023, PR China.
| | - Ying An
- College of Food Science and Engineering, Nanjing University of Finance and Economics, Nanjing, Jiangsu, 210023, PR China
| | - Jilai Lu
- College of Food Science and Engineering, Nanjing University of Finance and Economics, Nanjing, Jiangsu, 210023, PR China
| | - Qingmiao Yu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu, 210023, PR China
| | - Zhen He
- Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, MO, 63130, USA.
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Kamio E, Kurisu H, Takahashi T, Matsuoka A, Yoshioka T, Nakagawa K, Sun Y, Matsuyama H. Effect of temperature on the osmotic behavior of LCST type ionic liquid solutions as draw solutions in the forward osmosis process. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2021.119164] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Einarsson SJ, Wu B. Thermal associated pressure-retarded osmosis processes for energy production: A review. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 757:143731. [PMID: 33279189 DOI: 10.1016/j.scitotenv.2020.143731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2020] [Revised: 10/25/2020] [Accepted: 10/31/2020] [Indexed: 06/12/2023]
Abstract
Climate change is an existential threat to global environments and human life. To achieve global mean temperature rise of below 1.5 °C, increasing utilization of renewable energy and minimizing CO₂ emission from fossil fuel industries have been emphasized by the United Nations. Pressure-retarded osmosis (PRO) has displayed its technical feasibility in capturing renewable energy from the salinity gradient of two streams through a semipermeable membrane. Towards achieving economic feasible PRO, process optimization, waste stream/heat utilization, and hybrid PRO processes have been attempted by theoretically modelling and experimental examination. Among these efforts, the thermal associated PRO processes have received great attention due to their improved power generation. In this paper, we aim to provide a comprehensive review on thermal associated PRO processes, focusing on the role of thermal behaviour in both stand-alone PRO and hybrid PRO processes (e.g. PRO-membrane distillation, PRO-thermosiphon, PRO-solar pond). Meanwhile, thermal associated draw solution development has been highlighted. Finally, a combination of PRO with high temperature/high pressure geothermal waste gas as draw solution is proposed and its technical and economic feasibility is discussed, especially under Icelandic scenario.
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Affiliation(s)
- Sigurður John Einarsson
- Faculty of Civil and Environmental Engineering, University of Iceland, Hjardarhagi 2-6, IS-107 Reykjavik, Iceland
| | - Bing Wu
- Faculty of Civil and Environmental Engineering, University of Iceland, Hjardarhagi 2-6, IS-107 Reykjavik, Iceland.
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