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Membranes
Special Issues
Effectivity Improvement for Forward Osmosis Water Treatment Technologies
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Effectivity Improvement for Forward Osmosis Water Treatment Technologies

A special issue of Membranes (ISSN 2077-0375). This special issue belongs to the section "Membrane Processing and Engineering".

Deadline for manuscript submissions: closed (30 September 2021) | Viewed by 6814

Special Issue Editors

Prof. Dr. Hanmin Zhang

E-Mail Website
Guest Editor
College of the Environment, Dalian University of Technology, Dalian 116023, China
Interests: membrane separation theory and technology; sewage and sludge resource utilization technology
Dr. Wei Yao

E-Mail Website
Co-Guest Editor
College of the Environment, Dalian University of Technology, Dalian, China
Interests: membrane fouling and control (mechanism and model) in membrane bioreactor (MBR)

Special Issue Information

Dear Colleagues,

Forward osmosis is an osmosis-driven membrane separation process, in which water spontaneously penetrates through the semi-permeable membrane from the feed solution (with high water chemical potential) to the draw solution (with low water chemical potential). There is no need for external pressure; it has the benefits of low energy consumption potential, high water recovery rate and low membrane fouling in the reuse of wastewater. Up to now, the application of forward osmosis (FO) membranes in seawater desalination, space, emergency rescue and other situations to extract drinking water from sewage has been developed to an industrial scale.

Recently, research on the development of a novel draw solution to reduce reverse solute diffusion, emerging membrane material fabrication to eliminate concentration polarization, and membrane fouling control technology, has become the focus of researchers and engineering technicians. Forward osmosis (FO) has attracted more and more attention in the applied research as regards its utilization in resource recovery, sludge dewatering and industrial wastewater concentration since 1996. Although the FO process has broad potential applicability, researchers should closely focus on solving the obstacles of the forward osmosis membrane process, fully exploiting its advantages and broadening this technology’s application range to make FO technology more efficient and sustainable in wastewater treatment.

This Special Issue is dedicated to "Effectivity Improvement for Forward Osmosis Water Treatment Technologies". Researchers can submit manuscripts in the form of research articles (based on laboratory-scale or pilot-scale experiments or simulation results), technical reports, case studies and reviews. Related topics include: forward osmosis draw solution development; forward osmosis membrane fabrication; forward osmosis membrane fouling control; forward osmosis application technology in industrial wastewater recovery; forward osmosis desalination technology, and so on.

Prof. Dr. Hanmin Zhang
Dr. Wei Yao
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Membranes is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • forward osmosis membrane
  • membrane separation
  • membrane fouling
  • draw solution
  • concentration
  • recovery

Published Papers (2 papers)

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Research

17 pages, 36623 KiB  
Article
Impact of a Graphene Oxide Reducing Agent on a Semi-Permeable Graphene/Reduced Graphene Oxide Forward Osmosis Membrane Filtration Efficiency
by Grzegorz Romaniak, Konrad Dybowski, Anna Jędrzejczak, Anna Sobczyk-Guzenda, Bartłomiej Januszewicz, Witold Szymański, Paulina Kowalczyk, Tomasz Kaźmierczak, Jan Siniarski and Piotr Kula
Membranes 2021, 11(9), 679; https://doi.org/10.3390/membranes11090679 - 31 Aug 2021
Cited by 3 | Viewed by 2693
Abstract
Graphene has been considered as a material that may overcome the limitations of polymer semi-permeable membranes in water treatment technology. However, monolayer graphene still suffers from defects that cause leakage. Here, we report a method of sealing defects in graphene transferred onto porous [...] Read more.
Graphene has been considered as a material that may overcome the limitations of polymer semi-permeable membranes in water treatment technology. However, monolayer graphene still suffers from defects that cause leakage. Here, we report a method of sealing defects in graphene transferred onto porous polymer substrate via reduced graphene oxide (rGO). The influence of various reducing agents (e.g., vitamin C, hydrazine) on the properties of rGO was investigated by SEM, Raman, FTIR, and XRD. Subsequently, membranes based on graphene/reduced graphene oxide were tested in a forward osmosis system using sodium chloride (NaCl). The effect of the effectiveness of the reduction of graphene oxide, the type and number of attached groups, the change in the distance between the rGO flakes, and the structure of this material were examined in terms of filtration efficiency. As a result, semi-permeable centimetre-scale membranes with ion blocking efficiency of up to 90% and water flux of 20 mL h−1 m−2 bar−1 were proposed. Full article
(This article belongs to the Special Issue Effectivity Improvement for Forward Osmosis Water Treatment Technologies)
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18 pages, 2253 KiB  
Article
Membrane Fouling Behavior of Forward Osmosis for Fruit Juice Concentration
by Zihe Li, Chongde Wu, Jun Huang, Rongqing Zhou and Yao Jin
Membranes 2021, 11(8), 611; https://doi.org/10.3390/membranes11080611 - 11 Aug 2021
Cited by 9 | Viewed by 3615
Abstract
Forward osmosis (FO) technology has a broad application prospect in the field of liquid food concentration because of the complete retention of flavor components and bioactive substances. Membrane fouling is the main obstacle affecting the FO performance and concentration efficiency. This work systematically [...] Read more.
Forward osmosis (FO) technology has a broad application prospect in the field of liquid food concentration because of the complete retention of flavor components and bioactive substances. Membrane fouling is the main obstacle affecting the FO performance and concentration efficiency. This work systematically investigated the membrane fouling behavior of the FO process for fruit juice concentration elucidated by the models of resistance-in-series, xDLVO theory and FTIR analysis. The results show that the AL-FS mode was more suitable for concentrating orange juice. Increasing the cross-flow rate and pretreatment of feed solutions can effectively improve the water flux and reduce the fouling resistance. The ATR-FTIR analysis revealed that the fouling layer of orange juice was mainly composed of proteins and polysaccharides, and the pretreatment of microfiltration can greatly reduce the content of the major foulant. There was an attractive interaction between the FO membrane and orange juice foulants; by eliminating those foulants, the microfiltration pretreatment then weakened such an attractive interaction and effectively prevented the fouling layer from growing, leading to a lower process resistance and, finally, resulting in a great improvement of concentration efficiency. Full article
(This article belongs to the Special Issue Effectivity Improvement for Forward Osmosis Water Treatment Technologies)
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