Recent Mitigation Strategies on Membrane Fouling for Oily Wastewater Treatment

Zulkefli, Nur Fatihah; Alias, Nur Hashimah; Jamaluddin, Nur Shafiqah; Abdullah, Norfadhilatuladha; Manaf, Shareena Fairuz Abdul; Othman, Nur Hidayati; Marpani, Fauziah; Shayuti, Muhammad Shafiq Mat; Kusworo, Tutuk Djoko

doi:10.3390/membranes12010026

Cited by 39 publications

(16 citation statements)

References 123 publications

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“…Furthermore, the AFM analysis detected that by adding oil to the feedwater in run 6, many pores were blocked and the roughness of the fouled membrane surface was reduced as a result of the fully covered porosity of the membrane due to various fouling materials, which were covered with a layer of oil. Apparently, this happened because the membrane pores were filled with oil droplets, which then accumulated on the membrane surface, leading to an increase in the rejection percentage of salts and heavy metals and a decrease in the permeate water flux [45] …”

Section: Resultsmentioning

confidence: 99%

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The Effect of Organic Matter on Heavy Metals Removal from Simulated Wastewater using a Reverse Osmosis Membrane Process

2022

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The reverse osmosis (RO) technique is an effective method for producing potable water. It is commonly employed in water treatment facilities because of its lower cost and simplicity compared to other methods. The main challenge to the RO process is fouling, which leads to higher operating pressure, flux decline, and shortened membrane life. In this study, different simulated wastewater samples were used as feedwater to a lab-scale RO membrane system to investigate the effect of organic matter on the removal of heavy metals. In addition, the effect of individual salts, heavy metals, and oil on scaling formation was studied. Experimental data showed that when various pollutants were added to the feedwater, the permeate flux dropped from 142.86 LMH to 45.91 LMH, and the percentages of rejection for Na + , Ca + 2 , Mg + 2 , Cu + 2 , Cr + 3 , and oil were 96.56 %, 87.5 %, 95.5 %, 100 %, 100 %, and 99.96 %, respectively. The Scanning Electron Microscope (SEM) images showed a thin fouling layer that partially covered the membrane surface where the feedwater contained only NaCl salt. In contrast, it showed a thick layer of organic fouling that entirely covered the membrane surface when the feedwater contained all the other contaminants. Moreover, the Atomic Force Microscopy (AFM) showed that when oil was added to the feedwater, numerous pores were plugged and the surface roughness of the fouled membrane was reduced to 0.91 nm. Overall, the findings showed that oil in the feedwater enhanced the removal percentages of salts and heavy metals because the removal efficiency exceeded 96 %. Furthermore, Cr + 3 and oil were observed to reduce the permeate flux by 43 % and 49 %, respectively.

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Section: Resultsmentioning

confidence: 99%

“…Apparently, this happened because the membrane pores were filled with oil droplets, which then accumulated on the membrane surface, leading to an increase in the rejection percentage of salts and heavy metals and a decrease in the permeate water flux. [45]…”

Section: Atomic Force Microscopy (Afm) Imagementioning

confidence: 99%

The Effect of Organic Matter on Heavy Metals Removal from Simulated Wastewater using a Reverse Osmosis Membrane Process

2022

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“…Various technology, including oil-water separation membranes, 6,7 aerogels, 8 and coatings, [9][10][11] have been proposed for treating oily wastewater. [12][13][14] Wang et al 15 prepared d-CA nanofibrous membranes that are super amphiphilic in air, oleophobic in water, and super hydrophilic in oil by using electrostatic spinning combined with a deacetylation process. The separation flux of this membrane can be as high as 38,000 LÁm À2 Áh À1 , and the separation efficiency for different oil-water mixtures can be up to 99.97%.…”

Section: Introductionmentioning

confidence: 99%

“…Various technology, including oil–water separation membranes, 6,7 aerogels, 8 and coatings, 9–11 have been proposed for treating oily wastewater 12–14 . Wang et al 15 prepared d‐CA nanofibrous membranes that are super amphiphilic in air, oleophobic in water, and super hydrophilic in oil by using electrostatic spinning combined with a deacetylation process.…”

Section: Introductionmentioning

confidence: 99%

Cellulose acetate superhydrophobic coatings for efficient oil–water separation using a combination of electrostatic spraying and chemical vapor deposition

Fang,

Li,

Feng

et al. 2023

Polymer Engineering & Sci

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The efficient and simple separation of oil–water mixtures has been a global challenge due to the growing problem of oily wastewater. To address this issue, various materials with special wetting properties and functionality have been developed in the past decades for oil–water separation. In this study, a superhydrophobic cellulose acetate (CA) functional coating was prepared by electrostatic spraying of CA and chemical vapor deposition of methyltrichlorosilane (MTCS) on a stainless steel mesh (SSM). Water contact angle in air (WCA) of the resulting coating is154° or more, and oil under water contact angle (UWOCA) is 0°. Simultaneously, the separation flux of the resulting coating for oil–water mixtures is as high as 23977.77 L·m−2·h−1, with separation efficiencies exceeding 99%. Due to its excellent water repellency, the CA functional coating can effectively separate oil and water, and can be easily dried for continuous use. Furthermore, the CA functional coating exhibits good stability in salt solutions and acidic environments, making it an ideal material for addressing oily wastewater challenges.Highlights The coating obtained by electrostatic spraying and CVD was superhydrophobic. The separation flux and separation efficiencies of coatings is 23977.77 L·m−2·h−1 and 99%. Coatings remain stable under polar environment conditions (pH = 2–12 and NaCl = 1–3 mol/L).

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“…Oleophobic membranes are nonwetting toward oil droplets and may effectively retain the oil droplet at the surface of the membrane. , Oil droplets create interfaces at pore openings that prevent them from permeation, when the TMP is less than a threshold entry pressure. Water flux through the membrane carries with it oil droplets toward the membrane surface, the accumulation of which intensifies the problem of fouling. − Several chemical or physical methods have been applied to combat fouling. Most chemical methods incorporate agents that dissolve oil accumulated at the surface during membrane cleaning. , Physical methods, on the other hand, skim accumulated oil via, for example, a crossflow field. , Feed stream flowing along the membrane surface provides shear force that stresses pinned droplets to detach.…”

Section: Introductionmentioning

confidence: 99%

Capillary-Driven Ejection of a Droplet from a Micropore into a Channel: A Theoretical Model and a Computational Fluid Dynamics Verification

et al. 2022

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In this work, the problem of re-ejection of a permeating droplet through a membrane pore back to the feed channel when the transmembrane pressure (TMP) becomes zero is investigated. This problem is important in the context of oily water filtration using membranes. In particular, in the novel periodic feed pressure technique (PFPT), which has been proposed to combat membrane fouling, the TMP alternates between the operating value and zero in a periodic manner. During the period in which TMP is high, filtration occurs, and when it is zero, cleaning commences. We are particularly interested in what happens to a droplet, initially undergoing permeation, when the TMP becomes zero. It is evident that when the TMP is zero the meniscus inside the pore reverses its motion toward the feed channel rather than toward the permeate side by the action of interfacial tension force. A theoretical model is built to determine the rate at which the meniscus inside the pore advances when the TMP is zero. The conservation of momentum equation is used to establish a one-dimensional model that updates the location of the meniscus with time. The derived model considers both quasi-static and dynamic scenarios. In addition, the model accounts for both the viscosity contrast between the two fluids, as well as the gravity. A computational fluid dynamics (CFD) simulation has been built to provide a framework for model verification and validation. The model, based on quasi-static conditions, provides an overall similar trend to that obtained via CFD analysis. Nevertheless, the quasi-static model predicts a more rapid meniscus advancement inside the pore than the CFD simulation. When the dynamic contact angle is incorporated, very good matching is observed.

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Recent Mitigation Strategies on Membrane Fouling for Oily Wastewater Treatment

Cited by 39 publications

References 123 publications

The Effect of Organic Matter on Heavy Metals Removal from Simulated Wastewater using a Reverse Osmosis Membrane Process

The Effect of Organic Matter on Heavy Metals Removal from Simulated Wastewater using a Reverse Osmosis Membrane Process

Cellulose acetate superhydrophobic coatings for efficient oil–water separation using a combination of electrostatic spraying and chemical vapor deposition

Capillary-Driven Ejection of a Droplet from a Micropore into a Channel: A Theoretical Model and a Computational Fluid Dynamics Verification

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