Fouling in reverse osmosis membranes: monitoring, characterization, mitigation strategies and future directions

Ahmed, Mahmoud Ali; Amin, Sherif; Mohamed, Ashraf A.

doi:10.1016/j.heliyon.2023.e14908

Cited by 49 publications

(15 citation statements)

References 238 publications

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“…However, the subsequent increase in resistance at higher nanoparticle concentrations could indicate the onset of fouling, where the nanoparticles or other substances might accumulate on the membrane's surface or within its pores, obstructing fluid flow and impeding filtration efficiency. A similar trend was also observed for membrane resistance (Rm), adsorption (Ra), cake layer (Rc) and concentration polarization [54].…”

Section: Individual Resistancesupporting

confidence: 80%

Antifouling and and antibacterial study of PSf/bio-ZnO nanoparticle (bio-ZnO NP) mixed matrix membrane for humic acid separation

SHOHUR,

Harun,

JAMALLUDIN

et al. 2024

Preprint

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Zinc oxide nanoparticles (ZnO NP) are well-known for their efficacy as inorganic compounds with antifouling and antibacterial properties in membrane filtration. In this work, bio-zinc oxide nanoparticles (bio-ZnO NP) was synthesized using Aloe vera (Aloe barbadensis miller) powder as a green reducing agent and Zinc nitrate as a precursor through the sol-gel method. Subsequently, the bio-ZnO NP powder was incorporated into a polysulfone (PSf) membrane at varying weight percentages (0.1, 0.3, 0.5, and 1.0 Wt.%). The results indicate that the addition of bio-ZnO NP to PSf enhances the size and complexity of finger-like structures, leading to an increase in tensile strength from 31.9 MPa to 57.6 MPa. However, porosity also increases from 44.1% to 58.2% as the bio-ZnO/NP content rises from 0.1 wt.% to 0.5 wt.%. Notably, the PSf/bio-ZnO NP membrane with 0.5 wt.% concentration demonstrates the highest Pure Water Flux (PWF) at 517.9 LMH with humic acid rejection reaching 99.9%. Furthermore, the incorporation of bio-ZnO NP significantly enhances antibacterial activity, as reflected in the inhibition ring diameter increasing from 24.2 mm to 48.3 mm with higher bio-ZnO/NP concentrations. The PSf/bio-ZnO NP mixed matrix membrane (MMM) with 0.3 wt.% concentration exhibits optimal stability conditions, and superior antifouling properties, making it a promising candidate for membrane applications.

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Section: Individual Resistancesupporting

confidence: 80%

Antifouling and and antibacterial study of PSf/bio-ZnO nanoparticle (bio-ZnO NP) mixed matrix membrane for humic acid separation

SHOHUR,

Harun,

JAMALLUDIN

et al. 2024

Preprint

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“…This can help extend TFC membranes' life span, reducing overall downtime and operating costs. 45 Figure 5c shows the flux as a function of the impedance offered by the ECM filtration system during fouling. During the fouling period, the process can be divided into four stages, i.e., stages 1−4, as shown in Figure 5c.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Ex Situ and In Situ Organic Fouling Monitoring in Laser-Induced Graphene-Based Electroconductive Membranes for Desalination and Wastewater Treatment

Barbhuiya,

Singh

2024

ACS Appl. Nano Mater.

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During operation, the inevitable fouling of ultrafiltration (UF) membranes severely affects their performance in industrial separation processes, desalination, and wastewater treatment, necessitating effective fouling monitoring. Laser-induced graphene (LIG) is a facile method for fabricating UF electroconductive membranes (ECMs) and has shown enhanced emerging contaminant removal, antibiofilm and antimicrobial properties. However, no study has investigated the use of electrical signals for monitoring of organic fouling in LIG-based ECMs. This study investigates using LIG-based ECMs as an advanced tool for fouling detection and monitoring using a neutral foulant. The effect of fouling on electrical responses like surface resistance, cyclic voltammetry, chronoamperometry, and electrochemical impedance spectroscopy (EIS) was investigated in ex situ and in situ modes with three-electrode and two-electrode systems. Current responses showed a decreasing trend with fouling cycles, while the Nyquist plot showed both rightward and upward shifts with an increase in fouling. The normalized changes in EIS-derived resistance and impedance were found to be more sensitive than flux signals in the detection of fouling and continuous monitoring. The LIG-based ECM performs the dual role of the membrane as well as an advanced fouling monitoring tool, demonstrating early detection of fouling and a sudden increase in foulant concentration as compared to conventional methods. Such LIG-based ECMs provide better fouling monitoring strategies via both ex situ and in situ monitoring and can be used with more field-applicable two-electrode systems for industrial-scale applications. This can further help in optimizing fouling mitigation strategies for desalination and wastewater treatment.

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“…FRACTIONAL MODELLING OF THE REVERSE OSMOSIS PROCESS USED FOR DAM WATER DESALINATION 3 2007;Qrenawi and Abuhabib, 2020;Ahmed et al, 2023).…”

Section: Description Of Water Treatment By the Ro Processmentioning

confidence: 99%

Fractional modelling of the reverse osmosis process used for dam water desalination

2023

Global NEST: The International Journal

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<p>This paper deals with new fractional models to follow the performance of dam water reverse osmosis (DWRO) desalination system using the dimensionless cumulative volume of alimentation, permeate and rejection. The experimental data consist of 2561 points taken during 4 years of the lifetime of 66 organics reverse osmosis (RO) membranes. The accuracy of the established fractional models was verified using statistical criteria and a comparison with ordinary models. The fractional dimensionless models (FDM) with optimal kinetic constants gave an accurate result and perfect consistency with the experimental data. As such, the coefficient of determination (R2) values were 0.9975, 0.9750 and 0.9801, with lower average absolute relative deviation (AARD) around 8.03, 0.53 and 0.45, through lower root mean squared error (RMSE) about 1.452, 0.976 and 0.880 for alimentation, permeate and rejection, respectively.</p>

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Fouling in reverse osmosis membranes: monitoring, characterization, mitigation strategies and future directions

Cited by 49 publications

References 238 publications

Antifouling and and antibacterial study of PSf/bio-ZnO nanoparticle (bio-ZnO NP) mixed matrix membrane for humic acid separation

Antifouling and and antibacterial study of PSf/bio-ZnO nanoparticle (bio-ZnO NP) mixed matrix membrane for humic acid separation

Ex Situ and In Situ Organic Fouling Monitoring in Laser-Induced Graphene-Based Electroconductive Membranes for Desalination and Wastewater Treatment

Fractional modelling of the reverse osmosis process used for dam water desalination

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