Fouling mechanism identification and analysis in microfiltration of laundry wastewater

Choobar, Behnam Ghalami; Shahmirzadi, Mohammad Amin Alaei; Kargari, Ali; Manouchehri, Massoumeh

doi:10.1016/j.jece.2019.103030

Cited by 38 publications

(18 citation statements)

References 36 publications

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“…MF and UF membranes, for example, are particularly suitable for bio-application since their pore sizes are comparable to the average cell or protein dimensions; NF and RO membranes, instead, can be fouled even by small molecules such as salts and ions, since pore diameter corresponds to the dimensions of voids randomly created by the thermal motion of polymer chains [44]. Owing to the wide variety of foulants affecting filtration processes and to the complex interactions involved, membrane fouling has gained a lot of scientific interest, with a large number of studies devoted to the identification of the mechanisms underlying the transient accumulation process [45][46][47][48].…”

Section: The Fouling Phenomenamentioning

confidence: 99%

“…RO membranes, instead, can be fouled even by small molecules such as salts and ions, since pore diameter corresponds to the dimensions of voids randomly created by the thermal motion of polymer chains [44]. Owing to the wide variety of foulants affecting filtration processes and to the complex interactions involved, membrane fouling has gained a lot of scientific interest, with a large number of studies devoted to the identification of the mechanisms underlying the transient accumulation process [45][46][47][48]. Nominal pore size classification of membrane processes and characteristic dimensions of various common foulants.…”

Section: The Fouling Phenomenamentioning

confidence: 99%

“…To understand the fouling mechanisms that interest a filtration process, permeate flux data as a function of time are usually inferred using only one of the discussed blocking filtration laws or cake filtration model for the entire range of data [45,60]. Although such a procedure can lead to good interpretation, it typically represents the main disadvantage of the presented models.…”

Section: Combined Modelsmentioning

confidence: 99%

“…Such a procedure was adopted by Brião et al to evaluate the fouling behavior of ultrafiltration membranes, where the resistance-in-series model was also used to understand where the fouling happened preferentially [126]. A similar methodology was implemented by Choobar et al, who used a multistage Hermia model capable of giving information about the dominant mechanism at different times by only fitting a certain interval with the most appropriate mechanism [45]. The general equation of such a model is Equation ( 7):…”

Section: Combined Modelsmentioning

confidence: 99%

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Membrane Fouling Phenomena in Microfluidic Systems: From Technical Challenges to Scientific Opportunities

2021

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The almost ubiquitous, though undesired, deposition and accumulation of suspended/dissolved matter on solid surfaces, known as fouling, represents a crucial issue strongly affecting the efficiency and sustainability of micro-scale reactors. Fouling becomes even more detrimental for all the applications that require the use of membrane separation units. As a matter of fact, membrane technology is a key route towards process intensification, having the potential to replace conventional separation procedures, with significant energy savings and reduced environmental impact, in a broad range of applications, from water purification to food and pharmaceutical industries. Despite all the research efforts so far, fouling still represents an unsolved problem. The complex interplay of physical and chemical mechanisms governing its evolution is indeed yet to be fully unraveled and the role played by foulants’ properties or operating conditions is an area of active research where microfluidics can play a fundamental role. The aim of this review is to explore fouling through microfluidic systems, assessing the fundamental interactions involved and how microfluidics enables the comprehension of the mechanisms characterizing the process. The main mathematical models describing the fouling stages will also be reviewed and their limitations discussed. Finally, the principal dynamic investigation techniques in which microfluidics represents a key tool will be discussed, analyzing their employment to study fouling.

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Section: The Fouling Phenomenamentioning

confidence: 99%

Section: The Fouling Phenomenamentioning

confidence: 99%

Section: Combined Modelsmentioning

confidence: 99%

Section: Combined Modelsmentioning

confidence: 99%

See 2 more Smart Citations

Membrane Fouling Phenomena in Microfluidic Systems: From Technical Challenges to Scientific Opportunities

2021

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“…Xu et al, 2021). Manouchehri and Kargari et al (Ghalami Choobar, Alaei Shahmirzadi, Kargari, & Manouchehri, 2019) applied an MHM to identify the fouling mechanism during the MF of laundry wastewater.…”

Section: Introductionmentioning

confidence: 99%

Identification of the coupled fouling mechanism involved in microfiltration of tobacco extracts liquid by multistage Hermia model

Gao

Dong

et al. 2022

J Food Process Engineering

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Microfiltration (MF) is a promising technique widely applied in the separation of solidliquid mixtures. However, the potential application of MF was not explored much in the purification of tobacco extracts liquid. To be efficient, it necessitates having an assessment of the fouling mechanisms involved in MF processing. In this work, a thorough design of experiments was carried out to investigate various operating conditions, while specifying their effects on permeate flux were studied. Both single-stage and multistage Hermia models were used to elucidate the fouling mechanisms. The results of the single-stage Hermia model showed that cake layer formation was the dominant model, yet with fitting accuracy lower than 0.9; the type of fouling mechanism does relate to the operating conditions. Subsequently, the multistage Hermia model was used for determining the fouling mechanism during different time stages. It was found that the determinant coefficients R 2 were significantly increased and multiple fouling mechanisms could be coupled or occurred simultaneously. A ternary plot was established to visualize the contribution of each model and to bridge the relationship between the fouling mechanism and the operating conditions. Therefore, the proposed method is a valid, convenient tool when selecting optimal operating conditions with the lowest irreversible fouling. The flux recovery of fouled membranes exceeded 95% after successive cleaning with deionized water, a 1 wt% NaOH + 0.5 wt% SDS mixed solution, and a 0.5% (vol/vol) HNO 3 solution. Practical ApplicationsCeramic microfiltration membrane could separate tiny particles and macromolecules from tobacco extracts liquid (TEL) while it can keep most of active ingredients. The present study aims to have a better understanding of the complex membrane fouling mechanism in the MF processing of TEL. The fouling mechanism involved in the MF of TEL was firstly reported and a new method to bridge operating conditions and the fouling mechanism was proposed. It demonstrated that it is feasible to reduce irreversible membrane fouling by changing operating conditions during the initial stage of the MF processing. Identification of fouling mechanisms in the present study could be used to postpone fouling of the membranes by optimizing the operating parameters, and reduce irreversible membrane fouling.

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A comprehensive analysis of membrane fouling in microfiltration of complex linear macromolecules based on theoretical modeling and FESEM images

Heidari

Etemadi

Yegani

2020

J of Chemical Tech & Biotech

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BACKGROUNDMembrane technology is an attractive alternative to conventional water/wastewater treatment technologies as it is sustainable and can be used as an independent process as well as being a part of integrated systems with other treatment technologies. Notwithstanding the abundant benefits that membrane‐based systems offer, their commercial application is overshadowed by the ubiquitous fouling. However, accurate prediction and identification of membrane fouling mechanisms can help to open new doors in recognition of appropriate arrangements for developing more effective membrane synthesis methods and fundamental strategies to achieve better performance, especially in large‐scale production.RESULTSIn this study, three fouling models, namely resistance‐in‐series (RIS), Hermia's and combined cake filtration–pore blockage models, were applied to precisely analyze fouling behavior in dead‐end microfiltration (MF) of collagen solution, as model foulant, using pure high‐density polyethylene and modified high‐density polyethylene membranes. The RIS model was shown to be not representative of the real fouling mechanism in MF membrane units. Similarly, none of the classical models were able to accurately predict fouling in the entire MF process. However, the combined cake–intermediate blockage model provided excellent fits for the membranes.CONCLUSIONSObtained results also demonstrated that physical cleaning was not enough for organic fouling elimination in MF processes. Finally, computational results were validated with experimental observations of collagen rejection and field emission scanning electron microscopy analyses as well. © 2020 Society of Chemical Industry

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Fouling mechanism identification and analysis in microfiltration of laundry wastewater

Cited by 38 publications

References 36 publications

Membrane Fouling Phenomena in Microfluidic Systems: From Technical Challenges to Scientific Opportunities

Membrane Fouling Phenomena in Microfluidic Systems: From Technical Challenges to Scientific Opportunities

Identification of the coupled fouling mechanism involved in microfiltration of tobacco extracts liquid by multistage Hermia model

A comprehensive analysis of membrane fouling in microfiltration of complex linear macromolecules based on theoretical modeling and FESEM images

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