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Li Y, Dong Y, Chen S, Wu Y, Wang J, Nie Y. Fouling behavior of nanofiltration membrane during the refining treatment of morphlines-dominant reverse osmosis concentrate. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 364:121443. [PMID: 38878575 DOI: 10.1016/j.jenvman.2024.121443] [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: 03/22/2024] [Revised: 05/15/2024] [Accepted: 06/07/2024] [Indexed: 06/24/2024]
Abstract
Nanofiltration (NF) has been proven to be with great potential for the separation of morpholines with molecular weight less than 200 Da in refining reverse osmosis concentrate (ROC), but its application is significantly restricted by the membrane fouling, which can reduce the rejection and service time. To enable the long-term operation stability of nanofiltration, this work focuses on the fouling behavior of each substance in the hydrosaline organic solution on nanofiltration membrane, aiming to give insight into the fouling mechanism. To this end, in this work, the effects of salts (i.e NaCl and Na2SO4), organic substances (including N-(2-hydroxypropyl)morpholine(NMH) and 4-morpholineacetate(MHA)) and representative divalent ions (Ca2+ and Mg2+) on the performance and physicochemical properties of DK membrane were systematically investigated. The results show that both salts and organics can induce DK membrane swelling, leading to an increase of the mean effective pore size. After the filtration of Na2SO4-NaCl-H2O, the mean pore size increased by 0.002 nm, resulting in the decrease of the removal ratio of NMH and MHA for 3.82% and 13.10%, respectively. With static adsorption of NMH and MHA, the mean pore size of DK membrane increased by 0.005 and 0.003 nm. The swelling slowed the entrance of more organic molecules into membrane pores. Among them, MHA led to the terrible irreversible pore blocking. As the concentration of Ca2+ increased, gypsum scaling was formed on the membrane surface. During this process, NMH and MHA played different roles, i.e. NMH accelerated the CaSO4 crystallization while MHA inhibited. As a conclusion, the fouling behavior of substances in the high saline organic wastewater on DK membrane were systematically revealed with the fouling mechanisms proposed, which could provide an insightful guidance for membrane fouling control and cleaning in the treatment of high salinity and organic wastewater.
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Affiliation(s)
- Yahui Li
- Beijing Key Laboratory of Ionic Liquids Clean Process/State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China; Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing, 100190, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Petrochemical Research Institute, PetroChina, Beijing, 102206, China
| | - Yanan Dong
- Beijing Key Laboratory of Ionic Liquids Clean Process/State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China; Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing, 100190, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Shangqing Chen
- School of Chemical Engineering and Pharmacy, Hubei Key Lab of Novel Reactor & Green Chemical Technology, Key Laboratory of Green Chemical Engineering Process of Ministry of Education, Wuhan Institute of Technology, Wuhan, 430205, China.
| | - Yingqiu Wu
- Beijing Key Laboratory of Ionic Liquids Clean Process/State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China; Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing, 100190, China
| | - Junfeng Wang
- Beijing Key Laboratory of Ionic Liquids Clean Process/State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China; Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing, 100190, China.
| | - Yi Nie
- Beijing Key Laboratory of Ionic Liquids Clean Process/State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China; Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing, 100190, China
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Wang W, Root CW, Peel HF, Garza M, Gidley N, Romero-Mariscal G, Morales-Paredes L, Arenazas-Rodríguez A, Ticona-Quea J, Vanneste J, Vanzin GF, Sharp JO. Photosynthetic pretreatment increases membrane-based rejection of boron and arsenic. WATER RESEARCH 2024; 252:121200. [PMID: 38309061 DOI: 10.1016/j.watres.2024.121200] [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: 09/29/2023] [Revised: 01/10/2024] [Accepted: 01/23/2024] [Indexed: 02/05/2024]
Abstract
The metalloids boron and arsenic are ubiquitous and difficult to remove during water treatment. As chemical pretreatment using strong base and oxidants can increase their rejection during membrane-based nanofiltration (NF), we examined a nature-based pretreatment approach using benthic photosynthetic processes inherent in a unique type of constructed wetland to assess whether analogous gains can be achieved without the need for exogenous chemical dosing. During peak photosynthesis, the pH of the overlying clear water column above a photosynthetic microbial mat (biomat) that naturally colonizes shallow, open water constructed wetlands climbs from circumneutral to approximately 10. This biological increase in pH was reproduced in a laboratory bioreactor and resulted in analogous increases in NF rejection of boron and arsenic that is comparable to chemical dosing. Rejection across the studied pH range was captured using a monoprotic speciation model. In addition to this mechanism, the biomat accelerated the oxidation of introduced arsenite through a combination of abiotic and biotic reactions. This resulted in increases in introduced arsenite rejection that eclipsed those achieved solely by pH. Capital, operation, and maintenance costs were used to benchmark the integration of this constructed wetland against chemical dosing for water pretreatment, manifesting long-term (sub-decadal) economic benefits for the wetland-based strategy in addition to social and environmental benefits. These results suggest that the integration of nature-based pretreatment approaches can increase the sustainability of membrane-based and potentially other engineered treatment approaches for challenging water contaminants.
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Affiliation(s)
- Weishi Wang
- Department of Civil and Environmental Engineering, Colorado School of Mines, 1500 Illinois St., Golden, CO 80401, USA; Center for Mining Sustainability (Centro para Minería Sostenible), Colorado School of Mines and Universidad Nacional de San Agustín de Arequipa, Santa Catalina 117, Arequipa 04001, Peru
| | - Colin Wilson Root
- Department of Civil and Environmental Engineering, Colorado School of Mines, 1500 Illinois St., Golden, CO 80401, USA; Center for Mining Sustainability (Centro para Minería Sostenible), Colorado School of Mines and Universidad Nacional de San Agustín de Arequipa, Santa Catalina 117, Arequipa 04001, Peru
| | - Henry F Peel
- Department of Civil and Environmental Engineering, Colorado School of Mines, 1500 Illinois St., Golden, CO 80401, USA
| | - Maximilian Garza
- Department of Civil and Environmental Engineering, Colorado School of Mines, 1500 Illinois St., Golden, CO 80401, USA
| | - Nicholas Gidley
- Department of Civil and Environmental Engineering, Colorado School of Mines, 1500 Illinois St., Golden, CO 80401, USA
| | - Giuliana Romero-Mariscal
- Center for Mining Sustainability (Centro para Minería Sostenible), Colorado School of Mines and Universidad Nacional de San Agustín de Arequipa, Santa Catalina 117, Arequipa 04001, Peru; Facultad de Ingeniería de Procesos, Universidad Nacional de San Agustín de Arequipa. Santa Catalina 117, Arequipa 04001, Peru
| | - Lino Morales-Paredes
- Center for Mining Sustainability (Centro para Minería Sostenible), Colorado School of Mines and Universidad Nacional de San Agustín de Arequipa, Santa Catalina 117, Arequipa 04001, Peru; Facultad de Ciencias Naturales y Formales, Universidad Nacional de San Agustín de Arequipa. Santa Catalina 117, Arequipa 04001, Peru
| | - Armando Arenazas-Rodríguez
- Center for Mining Sustainability (Centro para Minería Sostenible), Colorado School of Mines and Universidad Nacional de San Agustín de Arequipa, Santa Catalina 117, Arequipa 04001, Peru; Facultad de Ciencias Biológicas, Universidad Nacional de San Agustín de Arequipa. Santa Catalina 117, Arequipa 04001, Peru
| | - Juana Ticona-Quea
- Center for Mining Sustainability (Centro para Minería Sostenible), Colorado School of Mines and Universidad Nacional de San Agustín de Arequipa, Santa Catalina 117, Arequipa 04001, Peru; Facultad de Ciencias Naturales y Formales, Universidad Nacional de San Agustín de Arequipa. Santa Catalina 117, Arequipa 04001, Peru
| | - Johan Vanneste
- Department of Civil and Environmental Engineering, Colorado School of Mines, 1500 Illinois St., Golden, CO 80401, USA; Center for Mining Sustainability (Centro para Minería Sostenible), Colorado School of Mines and Universidad Nacional de San Agustín de Arequipa, Santa Catalina 117, Arequipa 04001, Peru
| | - Gary F Vanzin
- Department of Civil and Environmental Engineering, Colorado School of Mines, 1500 Illinois St., Golden, CO 80401, USA; Center for Mining Sustainability (Centro para Minería Sostenible), Colorado School of Mines and Universidad Nacional de San Agustín de Arequipa, Santa Catalina 117, Arequipa 04001, Peru
| | - Jonathan O Sharp
- Department of Civil and Environmental Engineering, Colorado School of Mines, 1500 Illinois St., Golden, CO 80401, USA; Center for Mining Sustainability (Centro para Minería Sostenible), Colorado School of Mines and Universidad Nacional de San Agustín de Arequipa, Santa Catalina 117, Arequipa 04001, Peru; Hydrologic Science and Engineering Program, Colorado School of Mines, Golden, CO 80401, USA.
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Du Y, Pramanik BK, Zhang Y, Jegatheesan V. Resource recovery from RO concentrate using nanofiltration: Impact of active layer thickness on performance. ENVIRONMENTAL RESEARCH 2023; 231:116265. [PMID: 37263466 DOI: 10.1016/j.envres.2023.116265] [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: 03/30/2023] [Revised: 05/20/2023] [Accepted: 05/27/2023] [Indexed: 06/03/2023]
Abstract
Modelling the removal of monovalent and divalent ions from seawater via nanofiltration is crucial for pre-treatment in seawater reverse osmosis systems. Effective separation of divalent ions through nanofiltration and allowing the permeate containing only monovalent ions to pass through the reverse osmosis system produces pure NaCl salt from the concentrate. However, the Donnan steric pore model and dielectric exclusion assume a uniformly distributed cylinder pore morphology, which is not representative of the actual membrane structure. This study analyzed the impact of membrane thickness on neutral solute removal and investigated the effect of two different methods for calculating the Peclet number on rejection rates of monovalent and divalent salts. Results show that membrane thickness has a significant effect on rejection rates, particularly for uncharged solutes in the range of 0.5-0.7 solute radius to membrane pore size ratio. Operating pressures above 10 bar favour the use of effective active layer thickness over the membrane pore size to calculate the Peclet number. At low pressures, using the effective active layer can lead to overestimation of monovalent salt rejection and underestimation of divalent salt rejection. This study highlights the importance of appropriate Peclet number calculation methods based on applied pressure when modelling membrane separation performance.
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Affiliation(s)
- Yuchen Du
- School of Engineering and Water: Effective Technologies and Tools (WETT) Research Centre, RMIT University, Melbourne, VIC, 3000, Australia
| | - Biplob Kumar Pramanik
- School of Engineering and Water: Effective Technologies and Tools (WETT) Research Centre, RMIT University, Melbourne, VIC, 3000, Australia
| | - Yang Zhang
- College of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China; Engineering Research Centre for Chemical Pollution Control and Resource Recovery, Shandong Provincial Education Department, Qingdao, 266042, China.
| | - Veeriah Jegatheesan
- School of Engineering and Water: Effective Technologies and Tools (WETT) Research Centre, RMIT University, Melbourne, VIC, 3000, Australia.
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