Fouling mitigation strategies for different foulants in membrane distillation

Alkhatib, Amira; Ayari, Mohamed Arselene; Hawari, Alaa H.

doi:10.1016/j.cep.2021.108517

Cited by 99 publications

(52 citation statements)

References 220 publications

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“…Adapted from [129][130][131]. As high as possible Alkhatib et al [132] discussed and highlighted new findings on different foulants i the MD process. Furthermore, several fouling processes such as inorganic fouling, organi fouling, biological fouling, and colloidal fouling (Figure 24) were explored to improve th understanding and prevention of membrane fouling.…”

Section: Affects Typical Values (Commercial Membranes) Recommendationmentioning

confidence: 99%

Review of New Approaches for Fouling Mitigation in Membrane Separation Processes in Water Treatment Applications

2021

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This review investigates antifouling agents used in the process of membrane separation (MS), in reverse osmosis (RO), ultrafiltration (UF), nanofiltration (NF), microfiltration (MF), membrane distillation (MD), and membrane bioreactors (MBR), and clarifies the fouling mechanism. Membrane fouling is an incomplete substance formed on the membrane surface, which will quickly reduce the permeation flux and damage the membrane. Foulant is colloidal matter: organic matter (humic acid, protein, carbohydrate, nano/microplastics), inorganic matter (clay such as potassium montmorillonite, silica salt, metal oxide, etc.), and biological matter (viruses, bacteria and microorganisms adhering to the surface of the membrane in the case of nutrients) The stability and performance of the tested nanometric membranes, as well as the mitigation of pollution assisted by electricity and the cleaning and repair of membranes, are reported. Physical, chemical, physico-chemical, and biological methods for cleaning membranes. Biologically induced biofilm dispersion effectively controls fouling. Dynamic changes in membrane foulants during long-term operation are critical to the development and implementation of fouling control methods. Membrane fouling control strategies show that improving membrane performance is not only the end goal, but new ideas and new technologies for membrane cleaning and repair need to be explored and developed in order to develop future applications.

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Section: Affects Typical Values (Commercial Membranes) Recommendationmentioning

confidence: 99%

Review of New Approaches for Fouling Mitigation in Membrane Separation Processes in Water Treatment Applications

2021

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“…Another limitation of our modeling approach is that it does not consider membrane wetting; crystal growth in the membrane pores; or organic, biological, or colloidal fouling [7,13,54]. In our experiments, we did not observe a detriment in the quality of the distilled solution, and thus, our results suggest that membrane wetting did not occur and that salt crystals were likely formed at the membrane surface and were removed by the cleaning process.…”

Section: Discussionmentioning

confidence: 77%

“…Therefore, it is important to recall the limitations of this work, as our model assumes inorganic fouling at the membrane surface, and our observations suggest that this was the case in the experiments that were performed. Nonetheless, this may not be the case when working with real conditions, in which organic, biological, and colloidal fouling can also occur [54]. These foulants can not only reduce the permeability through the membrane but also decrease its hydrophobicity.…”

Section: Discussionmentioning

confidence: 99%

“…These foulants can not only reduce the permeability through the membrane but also decrease its hydrophobicity. Moreover, fouling also reduces the lifecycle efficiency of the membrane, which in turn results in an increase in the energy usage, an increase in the frequency of membrane cleaning and/or membrane substitution, and consequently an increase of the maintenance costs of the overall process [54]. Note also that the cleaning agents must be selected carefully, as they also may influence membrane properties [47,54,55].…”

Section: Discussionmentioning

confidence: 99%

“…Moreover, fouling also reduces the lifecycle efficiency of the membrane, which in turn results in an increase in the energy usage, an increase in the frequency of membrane cleaning and/or membrane substitution, and consequently an increase of the maintenance costs of the overall process [54]. Note also that the cleaning agents must be selected carefully, as they also may influence membrane properties [47,54,55]. The impact of other types of fouling, as well as of the cleaning agent, on membrane properties must be explored in future investigations.…”

Section: Discussionmentioning

confidence: 99%

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Water Flux Prediction in Direct Contact Membrane Distillation Subject to Inorganic Fouling

Suárez

Río

Aravena³

2022

Membranes

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Freshwater is a limited resource, which has driven the development of new purification and water-reuse technologies. One promising technology for water treatment is membrane distillation (MD). One of the main problems of MD, and of many desalination technologies, is membrane fouling, which reduces the performance of the membrane. This work presents a mathematical model that aims to predict distillate fluxes in direct-contact MD when fouling occurs as salts are deposited onto the membrane surface, forming an inorganic fouling layer. The mathematical model uses a heat- and mass-transfer formulation for prediction of the distillate flux under steady state conditions, and it is combined with the cake-filtration theory to represent the distillate fluxes after the onset of membrane fouling. Model results agree well with experimental observation of distillate fluxes, both before (~12–14 kg m−2 h−1) and after the onset of membrane fouling, with root-mean-square errors smaller than 1.4 kg m−2 h−1 in all the experiments. These results suggest that the cake-filtration theory can be used to represent water flux decline in MD membranes prone to inorganic fouling. From our experiments and from the modelling exercise, we found that the onset of membrane failure was relatively constant; the precipitation reaction constant is conditioned by the physicochemical interaction between the feed solution and the membrane; and the rate of flux decline after membrane fouling depends on flow conditions as well as on the precipitation compound. However, the proposed model has limitations that must be addressed in future investigations to validate it under a wider range of operating conditions, for membranes composed by other materials and with different feed solutions to address organic, biological, and/or colloidal fouling, which typically occur under real conditions.

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The sustainable recycling of polyvinylidene fluoride membrane for tribological application

Liang

et al. 2023

J of Applied Polymer Sci

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In the study, the waste polyvinylidene fluoride (PVDF) membranes were recovered and the obtained resin powders by a solvent recovery method were employed for the fabrication of a novel PVDF-based tribological composite.Herein, a new strategy was developed for applying the waste PVDF membranes to fabricate a self-lubricant composite, where the recycled PVDF powders acted as the polymer matrix and microcapsules with the configuration of polysulfone (PSF) capsuling lubricant oil (PAO) served as the filler. The morphologies, crystal phases, chemical components and groups as well as thermal stabilities of fabricated PAO@PSF/PVDF composites were characterized, and the self-lubricating and wear properties of fabricated composites were tested under the dry sliding condition using a ball-on-disc configuration. Experimental results suggest that the PAO@PSF/PVDF composite with an addition of 20 wt% PAO@PSF microcapsules exhibits the best tribological properties, in view of the lowest friction coefficient (0.077) and the smallest wear rate (2.34 Â 10 À15 m 3 /Nm). The incorporation of PAO@PSF microcapsules greatly reduces the friction coefficient of PVDF polymer. The tribological properties of fabricated PAO@PSF/PVDF composite will be expectable to that of the PVDF polymer with the dripping presence of lubricating oil.

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Fouling mitigation strategies for different foulants in membrane distillation

Cited by 99 publications

References 220 publications

Review of New Approaches for Fouling Mitigation in Membrane Separation Processes in Water Treatment Applications

Review of New Approaches for Fouling Mitigation in Membrane Separation Processes in Water Treatment Applications

Water Flux Prediction in Direct Contact Membrane Distillation Subject to Inorganic Fouling

The sustainable recycling of polyvinylidene fluoride membrane for tribological application

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