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Clean Technol.
Special Issues
Membrane Technology in Decentralized Applications
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Membrane Technology in Decentralized Applications

A special issue of Clean Technologies (ISSN 2571-8797). This special issue belongs to the section "Membrane Technology".

Deadline for manuscript submissions: closed (21 July 2023) | Viewed by 6836

Special Issue Editor

Prof. Dr. Patricia Luis Alconero

E-Mail Website
Guest Editor
Materials & Process Engineering, UCLouvain, Place Sainte Barbe 2, 1348 Louvain-la-Neuve, Belgium
Interests: sustainability; chemical engineering; process intensification; membrane technology; CO2 capture; applied thermodynamics; life cycle assessment
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Membrane technology is becoming a key solution in the persecution of more sustainable processes. In addition to its well-known advantages, such as high energy efficiency, easy scaling up and modular design, membrane devices are relatively easy to implement in areas where the geographic configuration makes the distribution of basic resources (e.g., water, electricity) very challenging. In this Special Issue, we try to show examples of applications in which membranes can improve people’s quality life in decentralised areas.

We look forward to receiving your research work to show the potential of membranes, which can help to fulfill the targets of the Sustainable Development Goals.

Prof. Dr. Patricia Luis
Guest Editor

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. Clean Technologies is an international peer-reviewed open access quarterly 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 1600 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

  • membrane technology
  • wastewater treatment
  • water potabilization
  • renewable energy
  • low-energy systems
  • decentralized systems

Published Papers (3 papers)

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Research

24 pages, 12595 KiB  
Article
Fluoride Removal and Recovery from Water Using Reverse Osmosis and Osmotic Membrane Crystallization
by Wuhib Zeine Ousman, Esayas Alemayehu and Patricia Luis
Clean Technol. 2023, 5(3), 973-996; https://doi.org/10.3390/cleantechnol5030049 - 07 Aug 2023
Cited by 1 | Viewed by 1814
Abstract
Fluoride is a concern for human health at high concentrations, but it is also a valuable compound with multiple applications. Thus, having a system that gives the opportunity to remove and recover this valuable element from water is highly interesting. Reverse osmosis (RO) [...] Read more.
Fluoride is a concern for human health at high concentrations, but it is also a valuable compound with multiple applications. Thus, having a system that gives the opportunity to remove and recover this valuable element from water is highly interesting. Reverse osmosis (RO) is a promising technology in the removal of fluoride from water. Nevertheless, the residual retentate highly concentrated in fluoride is still a concern. The aim of this study was to evaluate the performance of an integrated process consisting of RO and membrane crystallization to remove fluoride from water and to recover it as a pure fluoride salt. Pure water permeability and fluoride rejection of a commercial RO membrane was tested under different conditions. In addition, the performance of an osmotic membrane crystallization setup was evaluated, considering the effect caused by the flow rates and the concentration of both the feed and the osmotic solution on the mass transfer coefficient. The crystallization process allowed the production of pure NaF crystals with octahedral morphology with a face-centered cubic crystal system. Full article
(This article belongs to the Special Issue Membrane Technology in Decentralized Applications)
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13 pages, 3315 KiB  
Article
Membrane Filtration Applied to the Purification of Sugarcane Bagasse Mild Alkaline Extracts
by Vincent Oriez, Nga Thi-Thanh Pham, Jérôme Peydecastaing, Philippe Behra and Pierre-Yves Pontalier
Clean Technol. 2023, 5(2), 518-530; https://doi.org/10.3390/cleantechnol5020027 - 23 Apr 2023
Cited by 1 | Viewed by 1584
Abstract
Sugarcane bagasse (SCB), a by-product of the sugar industry, is composed mainly of cellulose, hemicelluloses, and lignin, and can be used to replace petrochemical polymers in various applications. In this work, SCB was treated under mild alkaline conditions with 1.5% NaOH (m:v) and [...] Read more.
Sugarcane bagasse (SCB), a by-product of the sugar industry, is composed mainly of cellulose, hemicelluloses, and lignin, and can be used to replace petrochemical polymers in various applications. In this work, SCB was treated under mild alkaline conditions with 1.5% NaOH (m:v) and a solid:liquid ratio of 1:20 (m:v) at 60 °C, during 6 h. A 10 kDa polysulfone hollow fiber membrane was used for the purification of the extract in different filtration modes, namely concentration and diafiltration, and a combination of both modes. Permeate fluxes and rejection rates were evaluated at different transmembrane pressure (TMP) at the shear rate of 10,187 s–1, at 40 °C. In concentration mode, increasing the volume reduction factor up to 6.1 led to a significant increase in the retention rates of acid-soluble lignin (ASL) and xylan, and a decrease in inorganic salt content in the retentate. In diafiltration mode, after 2.9 diavolumes, the acid-insoluble lignin (AIL) and xylan rejection rates drastically increased, as did the rejection rates of ash. Full article
(This article belongs to the Special Issue Membrane Technology in Decentralized Applications)
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17 pages, 4234 KiB  
Article
Evaluation of Commercial Reverse Osmosis and Nanofiltration Membranes for the Removal of Heavy Metals from Surface Water in the Democratic Republic of Congo
by Vercus Lumami Kapepula, Mar García Alvarez, Vida Sang Sefidi, Estella Buleng Njoyim Tamungang, Théophile Ndikumana, Dieu-Donné Musibono, Bart Van Der Bruggen and Patricia Luis
Clean Technol. 2022, 4(4), 1300-1316; https://doi.org/10.3390/cleantechnol4040080 - 14 Dec 2022
Cited by 11 | Viewed by 2946
Abstract
This study evaluates the performance of commercial reverse osmosis (RO) and nanofiltration (NF) membranes for the removal of metal ions from synthetic water and surface water carried from the north-west of Lake Tanganyika in the city of Uvira, in the east of the [...] Read more.
This study evaluates the performance of commercial reverse osmosis (RO) and nanofiltration (NF) membranes for the removal of metal ions from synthetic water and surface water carried from the north-west of Lake Tanganyika in the city of Uvira, in the east of the Democratic Republic of Congo. Metal ion analyses were performed by the standardized ICP-MS and ICP-OES methods. The RO membrane showed higher metal ion rejection in high-concentration solutions (synthetic samples) prepared in the laboratory as well as in low-concentration samples from real raw water collected near Lake Tanganyika. Rejection levels were higher than 98% for Cr3+, Pb2+, Cd2+, As3+, Ni2+, and Sb+3 ions in the synthetic solutions, and 99.2, 98.8, 98.6, 99.2, 98.4, and 98.8%, respectively, in the real samples. The concentrations of metals in the permeate varied depending on the feed concentration and were 0.15 to 1.02 mg/L, 0.33 to 22 mg/L, and 0.11 to 22 mg/L in RO, NF90, and NF270 membranes, respectively. Regarding the NF membranes, the rejection of Cr, Ni, and Cd ions was interesting: 98.2, 97.8, and 92.3%, respectively. However, it was lower for Pb, As, and Sb ions: 76.9, 52.5 and 64.1%, respectively. The flux of NF was 329 to 375 L/m2.h, much higher than for RO membranes, which had a flux of 98 to 132 L/m2.h. The studied membranes are thus a feasible solution to remove the studied metals from real water sources at low concentrations since they meet the standards of the World Health Organization on specific values assigned to chemicals from industrial sources and human habitation areas where these ions are present in drinking water. Full article
(This article belongs to the Special Issue Membrane Technology in Decentralized Applications)
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