Special Issue "Integrated Membrane Systems and Processes"

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

Deadline for manuscript submissions: closed (31 July 2020).

Special Issue Editors

Dr. Alfredo Cassano
E-Mail Website
Guest Editor
Institute on Membrane Technology, ITM-CNR, via P. Bucci, 17/C, I-87036 Rende, Italy
Interests: membranes and integrated membrane operations in agro-food production and industrial wastewater treatment; recovery of bioactive compounds from agro-food byproducts by membrane-based operations; separation/concentration/purification of target compounds of industrial interest by membrane; membrane distillation and osmotic distillation; remediation and pollution control of industrial wastewater by membrane operations
Special Issues and Collections in MDPI journals
Dr. Alberto Figoli
E-Mail Website
Guest Editor

Special Issue Information

Dear Colleagues,

The combination of membrane unit operations in the overall purification or production scheme of industrial processes is an emerging tool for improving product quality as well as process capacity and selectivity. The specific feature of hybrid processes is the synergy resulting from this integration, which enhances process effectiveness.

Pressure-driven membrane processes have been often associated with a cascade configuration in purification processes. New perspectives arise from the combination of these processes with innovative membrane techniques such as membrane distillation (MD), membrane emulsification (ME), membrane bioreactor (MBr), pervaporation (PV), and molecular imprinted membranes. Such an approach allows one to redesign the traditional schemes of industrial production in agreement with process intensification and zero-discharge strategies.

This Special Issue aims to provide some relevant examples of integrated membrane operations in different fields, including water desalination, food industry, wastewater treatment, biotechnology, and pharmaceutics. It welcomes both original contributions and reviews on the present state of the research and advancement of hybrid membrane systems in these fields, highlighting the advantages over conventional technologies in terms of product quality, plant compactness, rationalization and optimization of productive cycles, and reduction of environmental impact and energy consumption.

Dr. Alfredo Cassano
Dr. Alberto Figoli
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 papers will be 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 1800 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

  • Integrated membrane operations
  • Desalination
  • Agro-food productions
  • Wastewater treatments
  • Pressure-driven membrane operations
  • Membrane contactors
  • Process intensification
  • Zero discharge

Published Papers (4 papers)

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Research

Article
Integrated Membrane Process for the Treatment and Reuse of Residual Table Olive Fermentation Brine and Anaerobically Digested Sludge Centrate
Membranes 2020, 10(10), 253; https://doi.org/10.3390/membranes10100253 - 24 Sep 2020
Cited by 2 | Viewed by 612
Abstract
Management of wastewater is a major challenge nowadays, due to increasing water demand, growing population and more stringent regulations on water quality. Wastewaters from food conservation are especially difficult to treat, since they have high salinity and high organic matter concentration. The aim [...] Read more.
Management of wastewater is a major challenge nowadays, due to increasing water demand, growing population and more stringent regulations on water quality. Wastewaters from food conservation are especially difficult to treat, since they have high salinity and high organic matter concentration. The aim of this work is the treatment of the effluent from a table olive fermentation process (FTOP) with the aim of reusing it once the organic matter is separated. The process proposed in this work consists of the following membrane-based technologies: Ultrafiltration (UF) (UP005, Microdyn Nadir), Forward Osmosis (FO) (Osmen2521, Hydration Technology Innovation) and Nanofiltration (NF) (NF245, Dow). The FO process was implemented to reduce the salinity entering the NF process, using the FTOP as draw solution and, at the same time, to concentrate the centrate produced in the sludge treatment of a municipal wastewater treatment plant with the aim of obtaining a stream enriched in nutrients. The UF step achieved the elimination of 50% of the chemical oxygen demand of the FTOP. The UF permeate was pumped to the FO system reducing the volume of the anaerobically digested sludge centrate (ADSC) by a factor of 3 in 6.5 h. Finally, the ultrafiltrated FTOP diluted by FO was subjected to NF. The transmembrane pressure needed in the NF stage was 40% lower than that required if the ultrafiltration permeate was directly nanofiltered. By means of the integrated process, the concentration of organic matter and phenolic compounds in the FTOP decreased by 97%. Therefore, the proposed process was able to obtain a treated brine that could be reused in other processes and simultaneously to concentrate a stream, such as the ADSC. Full article
(This article belongs to the Special Issue Integrated Membrane Systems and Processes)
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Article
Evaluation of an Integrated Ultrafiltration/Solid Phase Extraction Process for Purification of Oligomeric Grape Seed Procyanidins
Membranes 2020, 10(7), 147; https://doi.org/10.3390/membranes10070147 - 09 Jul 2020
Cited by 3 | Viewed by 974
Abstract
The effectiveness of a preparative integrated ultrafiltration/solid-phase extraction (UF/SPE) process for purification of oligomeric procyanidins (OPCs) from a crude grape seed extract (GSE) was studied for the first time. The separation of OPCs from polymeric procyanidins (PPCs) by UF was very efficient. The [...] Read more.
The effectiveness of a preparative integrated ultrafiltration/solid-phase extraction (UF/SPE) process for purification of oligomeric procyanidins (OPCs) from a crude grape seed extract (GSE) was studied for the first time. The separation of OPCs from polymeric procyanidins (PPCs) by UF was very efficient. The membrane showed an acceptable filtration flux of 6 to 3.5 L/h·m2 at 0.5 bar of transmembrane pressure and 95% recovery of its water flux after chemical cleaning. The process was scalable to a pilot scale. The separation of very polar and ionic species from OPCs by SPE (XAD7HP and XAD16 resins) was also very good, but both adsorbents lost their retention capacities quickly, due probably to irreversible retention of OPCs/PPCs. Even though the global purification of OPCs by the integrated UF/SPE process allowed the recovery of 24.2 g of highly purified OPCs (83% purity) from 14.4 L of crude grape seed extract, the use of these adsorbents for further purification of the OPCs was very limited. Full article
(This article belongs to the Special Issue Integrated Membrane Systems and Processes)
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Article
Optimization of Air Backwash Frequency during the Ultrafiltration of Seawater
Membranes 2020, 10(4), 78; https://doi.org/10.3390/membranes10040078 - 22 Apr 2020
Cited by 2 | Viewed by 856
Abstract
The main objective of this paper is to study the effect of new air backwash on dead-end ultrafiltration of seawater with a pilot at semi-industrial scale (20 m3/day). To control membrane fouling, two different backwashes were used to clean the membrane: [...] Read more.
The main objective of this paper is to study the effect of new air backwash on dead-end ultrafiltration of seawater with a pilot at semi-industrial scale (20 m3/day). To control membrane fouling, two different backwashes were used to clean the membrane: classical backwash (CB) and new air backwash (AB) that consists of injecting air into the membrane module before a classical backwash. To evaluate the efficiency of AB and CB, a resistance in series model was used to calculate each resistance: membrane (Rm), reversible (Rrev) and irreversible (Rirr). The variation of the seawater quality was considered by integrating the turbidity variation versus time. The results indicate clearly that AB was more performant than CB and frequency of AB/CB cycles was important to control membrane fouling. In this study, frequencies of 1/5 and 1/3 appear more efficient than 1/7 and 1/9. In addition, the operation conditions (flux and time of filtration) had an important role in maintaining membrane performance—whatever the variation of the seawater quality. Full article
(This article belongs to the Special Issue Integrated Membrane Systems and Processes)
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Article
The Function of Adsorption, Photo-Oxidation, and Humic Acid Using Air Backwashing in Integrated Water Treatment of Multichannel Ceramic MF and PP Particles
Membranes 2020, 10(2), 28; https://doi.org/10.3390/membranes10020028 - 11 Feb 2020
Cited by 1 | Viewed by 894
Abstract
For advanced water treatment, function of microfiltration (MF), adsorption, photo-oxidation, humic acid (HA), and polypropylene (PP) particles on membrane fouling and decay effectiveness were investigated in an integrated water treatment, of multichannel ceramic MF and PP particles, using UV radiation and air backwashing. [...] Read more.
For advanced water treatment, function of microfiltration (MF), adsorption, photo-oxidation, humic acid (HA), and polypropylene (PP) particles on membrane fouling and decay effectiveness were investigated in an integrated water treatment, of multichannel ceramic MF and PP particles, using UV radiation and air backwashing. The synthetic feed was organized with HA and kaolin. The membrane fouling resistance (Rf) of the (MF + PP) system presented the lowermost, and amplified intensely from the (MF + UV) to MF system. The percentages of MF and adsorption by PP particles for turbidity treatment were 87.6% and 3.8%, individually; however, the percentages of MF and adsorption by PP particles for dissolved organic matters (DOM) treatment were 27.9% and 5.0%, respectively. The decay effectiveness of turbidity presented the greatest 95.4% at HA of 10 mg/L; however, that of DOM increased as HA concentration ascended. The ultimate Rf after 180 min procedure showed the maximum at 30 g/L of PP particles concentration, and improved dramatically, as PP particles decreased. Finally, the maximum VT was acquired at 30 and 50 g/L of PP particles, because flux preserved greater throughout the procedure. The decay effectiveness of turbidity and DOM showed the maximal 95.4% and 56.8% at 40 and 50 g/L of PP particles, respectively. Full article
(This article belongs to the Special Issue Integrated Membrane Systems and Processes)
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