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Lu YX, Yuan H, Shao Y, Chand H, Wu Y, Yang YL, Song HL. Shedding light on the transfer of tetracycline in forward osmosis through experimental investigation and machine learning modeling. CHEMOSPHERE 2023; 319:137959. [PMID: 36709845 DOI: 10.1016/j.chemosphere.2023.137959] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2022] [Revised: 01/20/2023] [Accepted: 01/23/2023] [Indexed: 06/18/2023]
Abstract
Tetracycline in wastewater can pose adverse impacts on the environment and human health. Forward osmosis (FO) is a promising method to reject antibiotics due to its low energy demand and high rejection rate. Tetracycline rejection during FO is a complicated process. Mechanistic models have been developed to describe antibiotic rejection by the FO membrane under ideal conditions but cannot be applied to real wastewater. Herein, the effects of draw concentration, pH, and solute type on the fate of tetracycline during FO were investigated by combining experimentation, factor analysis, and artificial neural network (ANN) modeling. High draw concentrations led to high convection that favored tetracycline diffusion. Low draw pH helped reject antibiotics potentially due to the decreased tortuosity and pore size of the FO membrane. When different draw solutes were tested, both convection and electrostatic interaction exerted effects on tetracycline retention on the FO membrane surface, and steric hindrance could further affect the amount of tetracycline in the draw solution. Exploratory factor analysis (EFA) showed that tetracycline rejection was a combined result of convection, steric hindrance, and electrostatic interactions. Path analysis revealed the significant roles of initial conductivity and draw pH in tetracycline rejection. Eight representative input variables were selected from 13 observed explanatory variables using redundancy analysis (RDA), based on which an ANN was trained and successfully predicted tetracycline diffusion and transfer through the FO membrane. These results have provided practical and predictive insights in the development of FO processes for efficient treatment of pharmaceutical wastewater.
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Affiliation(s)
- Yu-Xiang Lu
- School of Environment, Nanjing Normal University, Wenyuan Road 1, Nanjing, 210023, PR China
| | - Heyang Yuan
- Department of Civil and Environmental Engineering, Temple University, Philadelphia, PA, 19312, USA
| | - Yi Shao
- School of Environment, Nanjing Normal University, Wenyuan Road 1, Nanjing, 210023, PR China
| | - Hameer Chand
- School of Environment, Nanjing Normal University, Wenyuan Road 1, Nanjing, 210023, PR China
| | - You Wu
- School of Environment, Nanjing Normal University, Wenyuan Road 1, Nanjing, 210023, PR China
| | - Yu-Li Yang
- School of Environment, Nanjing Normal University, Wenyuan Road 1, Nanjing, 210023, PR China.
| | - Hai-Liang Song
- School of Environment, Nanjing Normal University, Wenyuan Road 1, Nanjing, 210023, PR China.
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2
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Development of high-performance CuBTC MOF-based forward osmosis (FO) membranes and their cleaning strategies. Chem Eng Res Des 2023. [DOI: 10.1016/j.cherd.2023.01.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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3
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Golgoli M, Khiadani M, Sen TK, Razmjou A, Johns ML, Zargar M. Synergistic effects of microplastics and organic foulants on the performance of forward osmosis membranes. CHEMOSPHERE 2023; 311:136906. [PMID: 36270521 DOI: 10.1016/j.chemosphere.2022.136906] [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: 08/13/2022] [Revised: 10/12/2022] [Accepted: 10/13/2022] [Indexed: 06/16/2023]
Abstract
Microplastics (MPs) are emerging contaminants that are abundantly present in the influent and effluent of wastewater treatment plants (WWTPs). Forward osmosis (FO) is an advanced treatment technology with potential applications in WWTPs. The presence of MPs in WWTP effluents can contribute to FO fouling and performance deterioration. This study focuses on FO membrane fouling by MPs of different sizes, and the interactional impacts of MPs and Humic acid (HA) (as the most common organic foulant in WWTPs) on FO membrane performance. The synergistic effect of combined MPs and HA fouling is shown to cause higher flux decline for FO membranes than that of HA or MPs alone. Reverse salt flux increased in the presence of MPs, and decreased when HA was present. Further, full flux recovery was obtained for all fouled membranes after hydraulic cleaning. This indicates the efficiency of FO systems for treating wastewater with high fouling potential. This study highlights the necessity of considering MPs in studying fouling behaviour, and for mitigation strategies of membranes used in WWT. The fundamentals created here can be further extended to other membrane-assisted separation processes.
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Affiliation(s)
- Mitra Golgoli
- School of Engineering, Edith Cowan University, 270 Joondalup Drive, Joondalup, Perth, WA, 6027, Australia
| | - Mehdi Khiadani
- School of Engineering, Edith Cowan University, 270 Joondalup Drive, Joondalup, Perth, WA, 6027, Australia
| | - Tushar Kanti Sen
- Chemical Engineering Department, King Faisal University, P.O. Box: 380, Al-Ahsa, 31982, Saudi Arabia
| | - Amir Razmjou
- School of Engineering, Edith Cowan University, 270 Joondalup Drive, Joondalup, Perth, WA, 6027, Australia; UNESCO Centre for Membrane Science and Technology, School of Chemical Engineering, University of New South Wales, Sydney, NSW, 2052, Australia; Mineral Recovery Research Center (MRRC), School of Engineering, Edith Cowan University, Joondalup, Perth, WA 6027, Australia
| | - Michael L Johns
- Fluid Science & Resources Division, Department of Chemical Engineering, The University of Western Australia, Crawley, WA, 6009, Australia
| | - Masoumeh Zargar
- School of Engineering, Edith Cowan University, 270 Joondalup Drive, Joondalup, Perth, WA, 6027, Australia; Mineral Recovery Research Center (MRRC), School of Engineering, Edith Cowan University, Joondalup, Perth, WA 6027, Australia.
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4
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Antibiofilm activity of glycolic acid and glyoxal and their diffusion–reaction interactions with biofilm components. Food Res Int 2022; 152:110921. [DOI: 10.1016/j.foodres.2021.110921] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Revised: 11/08/2021] [Accepted: 12/20/2021] [Indexed: 01/06/2023]
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5
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Selvan BK, Thiyagarajan K, Das S, Jaya N, Jabasingh SA, Saravanan P, Rajasimman M, Vasseghian Y. Synthesis and characterization of nano zerovalent iron-kaolin clay (nZVI-Kaol) composite polyethersulfone (PES) membrane for the efficacious As 2O 3 removal from potable water samples. CHEMOSPHERE 2022; 288:132405. [PMID: 34597639 DOI: 10.1016/j.chemosphere.2021.132405] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Revised: 09/20/2021] [Accepted: 09/27/2021] [Indexed: 06/13/2023]
Abstract
In this study, Kaolin clay, a mining material, was used as an abundant and available mineral as zero-valent iron-kaolinite composites for As2O3 removal from the water samples. The composites were made by the sodium borohydrate reduction method. The existence of Fe0 in the produced composites was confirmed by X-ray diffraction (XRD) and Fourier-Transform Infrared Spectroscopy (FTIR) analysis. The membranes are prepared with zerovalent nano Iron-Kaolin and PES. The synthesized composites were then mixed with polyethersulfone to prepare the membranes S1, S2, and S3 with varying compositions. Field Emission Scanning Electron Microscopy (FESEM) analysis of the produced membranes showed the porous structure and the contact angle of membranes increased the hydrophilicity. The membranes were explored for the removal of As2O3 (AsIII) in potable water samples. The filtration studies were carried out using the syringe filtration setup. Analysis of the arsenic (III) solution was carried out, before and after the filtration process using Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES), which showed a maximum of 50% reduction in its original concentration. The filtered membrane is analyzed for arsenic by Energy Dispersive X-ray (EDX) technique. Thus, the synthesized membrane effectively sieves the arsenic in water samples.
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Affiliation(s)
- B Karpanai Selvan
- Dravida Petroleum DMCC, ONGC BVG EPS, B-Athivaraganatham, Cuddalore, 608601, Tamil Nadu, India
| | - K Thiyagarajan
- Department of Nanoscience and Technology, University College of Engineering, BIT Campus, Anna University, Tiruchirappalli, 620 024, Tamil Nadu, India
| | - Soni Das
- Department of Biotechnology, University College of Engineering, BIT Campus, Anna University, Tiruchirappalli, 620 024, Tamil Nadu, India
| | - N Jaya
- Department of Petrochemical Technology, University College of Engineering, BIT Campus, Anna University, Tiruchirappalli, 620 024, Tamil Nadu, India.
| | - S Anuradha Jabasingh
- Process Engineering Division, School of Chemical and Bio Engineering, Addis Ababa Institute of Technology, Addis Ababa University, Ethiopia
| | - P Saravanan
- Department of Petrochemical Technology, University College of Engineering, BIT Campus, Anna University, Tiruchirappalli, 620 024, Tamil Nadu, India
| | - M Rajasimman
- Department of Chemical Engineering, Annamalai University, Annamalainagar, 60002, Tamil Nadu, India
| | - Yasser Vasseghian
- Department of Chemical Engineering, Quchan University of Technology, Quchan, Iran
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Nthunya LN, Bopape MF, Mahlangu OT, Mamba BB, Van der Bruggen B, Quist-Jensen CA, Richards H. Fouling, performance and cost analysis of membrane-based water desalination technologies: A critical review. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2022; 301:113922. [PMID: 34731960 DOI: 10.1016/j.jenvman.2021.113922] [Citation(s) in RCA: 30] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2021] [Revised: 09/06/2021] [Accepted: 10/06/2021] [Indexed: 05/05/2023]
Abstract
While water is a key resource required to sustain life, freshwater sources and aquifers are being depleted at an alarming rate. As a mitigation strategy, saline water desalination is commonly used to supplement the available water resources beyond direct water supply. This is achieved through effective advanced water purification processes enabled to handle complex matrix of saline wastewater. Membrane technology has been extensively evaluated for water desalination. This includes the use of reverse osmosis (RO) (the most mature membrane technology for desalination), pervaporation (PV), electrodialysis (ED), membrane distillation (MD), and membrane crystallization (MCr). Though nanofiltration (NF) is not mainly applied for desalination purposes, it is included in the reviewed processes because of its ability to reach 90% salt rejection efficiency for water softening. However, its comparison with other technologies is not provided since NF cannot be used for removal of NaCl during desalination. Remarkably, membrane processes remain critically affected by several challenges including membrane fouling. Moreover, capital expenditure (CAPEX) and operating expenditure (OPEX) are the key factors influencing the establishment of water desalination processes. Therefore, this paper provides a concise and yet comprehensive review of the membrane processes used to desalt saline water. Furthermore, the successes and failures of each process are critically reviewed. Finally, the CAPEX and OPEX of these water desalination processes are reviewed and compared. Based on the findings of this review, MD is relatively comparable to RO in terms of process performance achieving 99% salt rejections. Also, high salt rejections are reported on ED and PV. The operation and maintenance (O&M) costs remain lower in ED. Notably, the small-scale MD OPEX falls below that of RO. However, the large-scale O&M in MD is rarely reported due to its slow industrial growth, thus making RO the most preferred in the current water desalination markets.
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Affiliation(s)
- Lebea N Nthunya
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Private Bag X3, 2050, Johannesburg, South Africa.
| | - Mokgadi F Bopape
- Department of Chemical, Metallurgical and Material Engineering, Tshwane University of Technology, Private Bag x680, Pretoria, 0001, South Africa; Department of Chemical Engineering, KU Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium
| | - Oranso T Mahlangu
- Institute for Nanotechnology and Water Sustainability, College of Science, Engineering and Technology, University of South Africa, Florida 1709, Johannesburg, South Africa
| | - Bhekie B Mamba
- Institute for Nanotechnology and Water Sustainability, College of Science, Engineering and Technology, University of South Africa, Florida 1709, Johannesburg, South Africa
| | - Bart Van der Bruggen
- Department of Chemical Engineering, KU Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium
| | - Cejna Anna Quist-Jensen
- Center for Membrane Technology, Department of Chemistry and Bioscience, Aalborg University, Fredrik Bajers Vej 7H, 9220, Aalborg, Denmark
| | - Heidi Richards
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Private Bag X3, 2050, Johannesburg, South Africa
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7
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Review of New Approaches for Fouling Mitigation in Membrane Separation Processes in Water Treatment Applications. SEPARATIONS 2021. [DOI: 10.3390/separations9010001] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
This review investigates antifouling agents used in the process of membrane separation (MS), in reverse osmosis (RO), ultrafiltration (UF), nanofiltration (NF), microfiltration (MF), membrane distillation (MD), and membrane bioreactors (MBR), and clarifies the fouling mechanism. Membrane fouling is an incomplete substance formed on the membrane surface, which will quickly reduce the permeation flux and damage the membrane. Foulant is colloidal matter: organic matter (humic acid, protein, carbohydrate, nano/microplastics), inorganic matter (clay such as potassium montmorillonite, silica salt, metal oxide, etc.), and biological matter (viruses, bacteria and microorganisms adhering to the surface of the membrane in the case of nutrients) The stability and performance of the tested nanometric membranes, as well as the mitigation of pollution assisted by electricity and the cleaning and repair of membranes, are reported. Physical, chemical, physico-chemical, and biological methods for cleaning membranes. Biologically induced biofilm dispersion effectively controls fouling. Dynamic changes in membrane foulants during long-term operation are critical to the development and implementation of fouling control methods. Membrane fouling control strategies show that improving membrane performance is not only the end goal, but new ideas and new technologies for membrane cleaning and repair need to be explored and developed in order to develop future applications.
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8
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Cai M, Zhong H, Chu H, Zhu H, Sun P, Liao X. Forward osmosis concentration of high viscous polysaccharides of
Dendrobium officinale
: Process optimisation and membrane fouling analysis. Int J Food Sci Technol 2021. [DOI: 10.1111/ijfs.15225] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Ming Cai
- Department of Food Science and Technology Zhejiang University of Technology Hangzhou Zhejiang 310014 China
- Key Laboratory of Food Macromolecular Resources Processing Technology Research (Zhejiang University of Technology) China National Light Industry Hangzhou Zhejiang 310014 China
| | - Huazhao Zhong
- Department of Food Science and Technology Zhejiang University of Technology Hangzhou Zhejiang 310014 China
- Key Laboratory of Food Macromolecular Resources Processing Technology Research (Zhejiang University of Technology) China National Light Industry Hangzhou Zhejiang 310014 China
| | - Haoqi Chu
- Department of Food Science and Technology Zhejiang University of Technology Hangzhou Zhejiang 310014 China
- Key Laboratory of Food Macromolecular Resources Processing Technology Research (Zhejiang University of Technology) China National Light Industry Hangzhou Zhejiang 310014 China
| | - Hua Zhu
- Department of Food Science and Technology Zhejiang University of Technology Hangzhou Zhejiang 310014 China
- Key Laboratory of Food Macromolecular Resources Processing Technology Research (Zhejiang University of Technology) China National Light Industry Hangzhou Zhejiang 310014 China
| | - Peilong Sun
- Department of Food Science and Technology Zhejiang University of Technology Hangzhou Zhejiang 310014 China
- Key Laboratory of Food Macromolecular Resources Processing Technology Research (Zhejiang University of Technology) China National Light Industry Hangzhou Zhejiang 310014 China
| | - Xiaojun Liao
- Beijing Advanced Innovation Center for Food Nutrition and Human Health College of Food Science and Nutritional Engineering China Agricultural University Beijing 100083 China
- Beijing Key Laboratory for Food Nonthermal Processing National Engineering Research Center for Fruit & Vegetable Processing Beijing 100083 China
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9
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Li MN, Chen XJ, Wan ZH, Wang SG, Sun XF. Forward osmosis membranes for high-efficiency desalination with Nano-MoS 2 composite substrates. CHEMOSPHERE 2021; 278:130341. [PMID: 33823353 DOI: 10.1016/j.chemosphere.2021.130341] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Revised: 03/08/2021] [Accepted: 03/19/2021] [Indexed: 06/12/2023]
Abstract
Attractive membranes are critical for improving efficiencies of forward osmosis (FO) desalination process. In this study, a novel FO-PES-MoS2 thin film composite (TFC) membrane was assembled using the phase transfer method through merging MoS2 nanosheets into substrate casting solution. A sequence of characterization techniques was applied to test microstructures and physicochemical properties of the membranes and modification mechanisms based on MoS2 concentrations. Desalination efficiencies of the fabricated membranes were assessed by three NaCl draw solutions. Compared to the blank membrane, the MoS2-contained membranes had a thinner active layer, more upright and open pore structure, higher porosity, and lower surface roughness. 1 wt% MoS2 content was the optimal modification condition, and water flux increased by 35.01% under this condition. Simultaneously, reverse salt flux of the FO-PES-1-MoS2 membrane declined by 29.15% under 1 M NaCl draw solution, indicating increased salt ion rejection performance of the modified membranes. Moreover, Js/Jv ratio indicated that MoS2 nanosheets helped stabilize the desalination performance of the membranes. This study demonstrated that the novel FO-PES-MoS2 TFC membranes possessed improved performances and showed promising properties for saline water desalination.
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Affiliation(s)
- Meng-Na Li
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Technology, Shandong University, Jinan, 250100, China; Faculty of Engineering and Applied Science, University of Regina, Regina, Saskatchewan, S4S 0A2, Canada
| | - Xiu-Juan Chen
- Faculty of Engineering and Applied Science, University of Regina, Regina, Saskatchewan, S4S 0A2, Canada
| | - Zhang-Hong Wan
- School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Shu-Guang Wang
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Technology, Shandong University, Jinan, 250100, China
| | - Xue-Fei Sun
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Technology, Shandong University, Jinan, 250100, China; School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, China.
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10
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Dual-objective optimization for energy-saving and fouling mitigation in MBR plants using AI-based influent prediction and an integrated biological-physical model. J Memb Sci 2021. [DOI: 10.1016/j.memsci.2021.119208] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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11
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Nguyen TT, Adha RS, Field RW, Kim IS. Extended performance study of forward osmosis during wastewater reclamation: Quantification of fouling-based concentration polarization effects on the flux decline. J Memb Sci 2021. [DOI: 10.1016/j.memsci.2020.118755] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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12
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Mahto A, Aruchamy K, Meena R, Kamali M, Nataraj SK, Aminabhavi TM. Forward osmosis for industrial effluents treatment – sustainability considerations. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2020.117568] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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13
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Fujioka T, Tra Ngo MT, Mochochoko T, Boivin S, Ohkuma N, Yasui H, Terashima M. Biofouling control of a forward osmosis membrane during single-pass pre-concentration of wastewater. CHEMOSPHERE 2020; 257:127263. [PMID: 32512337 DOI: 10.1016/j.chemosphere.2020.127263] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Revised: 05/27/2020] [Accepted: 05/29/2020] [Indexed: 06/11/2023]
Abstract
Pre-concentration of wastewater using a forward osmosis (FO) membrane prior to processing by an anaerobic digester can enhance biogas production. However, biofouling caused by microbes in wastewater remains a challenge. The study aimed to evaluate the efficacy of chloramination in mitigating the biofouling of an FO membrane during a single-pass concentration of primary wastewater effluent. Pre-disinfection at a chloramine dose of 22-121 mg/L successfully alleviated membrane fouling. Bacterial cell counts in the feed and concentrate showed that most of the bacterial cells in the wastewater were trapped on the membrane surface or spacer. The FO membrane surfaces in non-chloraminated/chloraminated systems were fully-covered by intact/damaged bacterial cells, respectively, indicating that chloramination effectively mitigated biofouling. However, due to high permeate-recovery and low cross-flow velocity in a single-pass concentration process, organic fouling on the membrane surface (and possibly on the interior wall of the membrane-pores) appeared to cause a gradual reduction in permeate-flux. This study demonstrated successful biofouling control using chloramination during a single-pass and high-recovery pre-concentration of primary wastewater effluent.
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Affiliation(s)
- Takahiro Fujioka
- Graduate School of Engineering, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki, 852-8521, Japan.
| | - My Thi Tra Ngo
- Graduate School of Engineering, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki, 852-8521, Japan
| | - Tanki Mochochoko
- Graduate School of Engineering, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki, 852-8521, Japan
| | - Sandrine Boivin
- Graduate School of Engineering, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki, 852-8521, Japan
| | - Naoki Ohkuma
- Water Reuse Promotion Center, 4-5 Nihonbashiyokoyamacho, Tokyo, 103-0003, Japan
| | - Hidenari Yasui
- Faculty of Environmental Engineering, The University of Kitakyushu, 1-1 Hibikino, Wakamatsu, Kitakyushu, Fukuoka, 808-0135, Japan
| | - Mitsuharu Terashima
- Faculty of Environmental Engineering, The University of Kitakyushu, 1-1 Hibikino, Wakamatsu, Kitakyushu, Fukuoka, 808-0135, Japan
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14
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Khraisheh M, Gulied M, AlMomani F. Effect of Membrane Fouling on Fertilizer-Drawn Forward Osmosis Desalination Performance. MEMBRANES 2020; 10:membranes10090243. [PMID: 32962071 PMCID: PMC7558361 DOI: 10.3390/membranes10090243] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Revised: 09/02/2020] [Accepted: 09/10/2020] [Indexed: 11/16/2022]
Abstract
Fertilizer-drawn forward osmosis (FDFO) has garnered immense attention for its application in the agricultural field and its potential to reuse wastewater sustainably. Membrane fouling, however, remains to be a challenge for the process. This study aims to investigate the influence of membrane fouling on the performance of the FDFO process. Synthetic wastewater (SWW) and multi-component fertilizer (MCF) were used as feed solution (FS) and draw solution (DS) with cellulose triacetate (CTA) forward osmosis (FO) membrane orientation. The performance was evaluated through water flux (WF), percentage recovery and percentage of salt reject. The WF declined from 10.32 LMH (L/m2·h) to 3.30 LMH when ultra-pure water as FS was switched with concentration FS indicating the dependence of the performance on the type of FS used. Accelerated fouling experiments conducted to verify the fouling behavior showed a decline in the water flux from 8.6 LMH to 3.09 LMH with SWW and 13.1 LMH to 3.42 LMH when deionized water was used as FS. The effects of osmotic backwashing and in situ flushing as physical cleaning methods of the foul membrane were studied through water flux and salt recovery percentage. Both cleaning methods yielded a WF close to the baseline. Osmotic backwashing yielded better results by eliminating foulant–foulant and foulant–membrane adhesion. The cleaning methods were able to recover 75% of phosphate and 60% of nitrate salts. Scanning electron microscopy (SEM), atomic force microscopy (AFM) and Fourier transform infrared (FTIR) results validated the effectiveness of the methods for the physical cleaning of foul membranes. This study underlines the importance of the FS used in FDFO and the effectiveness of osmotic backwashing as a cleaning method of FO membranes.
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