A Review on Current Development of Membranes for Oil Removal from Wastewaters

Bolto, B.A.; Zhang, Jianhua; Wu, Xing; Xie, Zongli

doi:10.3390/membranes10040065

Cited by 63 publications

(47 citation statements)

References 97 publications

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“…Therefore, for a highly viscous oil–water contamination separation process, the membrane undergoes a cleaning process for the reusability of the membrane due to its hydrophilic properties by washing the membrane with water and soap to remove oil on the membrane surface. The hydrophilic membranes experienced a lower decrease in the overall flux as compared to the hydrophobic membranes clogging the separator with oil because of the high concentration of the oil, which indicates a higher resistance to oil–water filtration [ 45 , 46 ]. Oil adhering to the surface reduce the performance and reusability of the membrane.…”

Section: Resultsmentioning

confidence: 99%

Functional Hydrophilic Membrane for Oil–Water Separation Based on Modified Bio-Based Chitosan–Gelatin

et al. 2021

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In this study, we fabricated a modified biomaterial based on chitosan and gelatin, which is an intrinsic hydrophilic membrane for oil–water separation to clean water contamination by oil. Modification of the membrane with a non-toxic natural crosslinker, genipin, significantly enhanced the stability of the biopolymer membrane in a water-based medium towards an eco-friendly environment. The effects of various compositions of genipin-crosslinked chitosan–gelatin membrane on the rheological properties, thermal stability, and morphological structure of the membrane were investigated using a dynamic rotational rheometer, thermogravimetry analysis, and chemical composition by attenuated total reflectance spectroscopy (ATR). Modified chitosan–gelatin membrane showed completely miscible blends, as determined by field-emission scanning electron microscopy, differential scanning calorimetry, and ATR. Morphological results showed membrane with establish microstructure to further experiment as filtration product. The membranes were successfully tested for their oil–water separation efficiencies. The membrane proved to be selective and effective in separating water from an oil–water mixture. The optimum results achieved a stable microporous structure of the membrane (microfiltration) and a separation efficiency of above 98%. The membrane showed a high permeation flux, generated as high as 698 and 420 L m−2 h−1 for cooking and crude oils, respectively. Owing to its outstanding recyclability and anti-fouling performance, the membrane can be washed away easily, ensuring the reusability of the prepared membrane.

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Section: Resultsmentioning

confidence: 99%

Functional Hydrophilic Membrane for Oil–Water Separation Based on Modified Bio-Based Chitosan–Gelatin

et al. 2021

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“…Ultrafiltration membranes (pore size around 0.1 micron to 0.01 micron) requiring an applying pressure of 1–10 bar [ 178 , 179 ] are suitable for separation of macromolecular sized particulates such as dissolved large natural organic molecules, bacteria, protozoa, and some viruses from water. This kind of filtration have been successfully used for the separation of small amounts of emulsions that cannot be treated by conventional treatment procedures [ 183 ].…”

Section: Environmental Applicationmentioning

confidence: 99%

The Role of Electrospun Nanomaterials in the Future of Energy and Environment

2021

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Electrospinning is one of the most successful and efficient techniques for the fabrication of one-dimensional nanofibrous materials as they have widely been utilized in multiple application fields due to their intrinsic properties like high porosity, large surface area, good connectivity, wettability, and ease of fabrication from various materials. Together with current trends on energy conservation and environment remediation, a number of researchers have focused on the applications of nanofibers and their composites in this field as they have achieved some key results along the way with multiple materials and designs. In this review, recent advances on the application of nanofibers in the areas—including energy conversion, energy storage, and environmental aspects—are summarized with an outlook on their materials and structural designs. Also, this will provide a detailed overview on the future directions of demanding energy and environment fields.

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“…Floating and dispersed oil can be removed by air flotation and flocculation, but emulsified oil cannot be removed (Tanudjaja et al 2019). Membrane filtration can remove particles smaller than 10 μm, so that membrane technology has been widely used to treat emulsified oily wastewater in recent years (Pulido 2016;Tanudjaja et al 2019;Bolto et al 2020).…”

Section: Introductionmentioning

confidence: 99%

PSU-g-SBMA hollow fiber membrane for treatment of oily wastewater

Shen

Zhang

Meng

2021

Water Science and Technology

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Ultrafiltration membranes can intercept oil particles smaller than 10 μm, but the membranes are easy to be contaminated by oil due to their hydrophobicity. To treat various oily wastewater, we prepared a hydrophilic hollow fiber membrane (HFM) with anti-fouling property by grafting sulfobetaine methacrylate (SBMA) onto polysulfone (PSU). For six simulated wastewater containing emulsified oil at 1,000 mg/L, the PSU-g-SBMA HFM was able to remove 98.5–99.7% of oil, higher than that of PSU HFM at 91.1–98.9%. The oil concentration in filtrate was less than 15 mg/L, which could meet the discharge standard of wastewater. The water flux of PSU-g-SBMA HFM can be completely recovered after being washed by rhamnolipid and alkali solution, while the same cleaning process could not recover the PSU HFM. As found, the contact angles of oil droplets on the PSU-g-SBMA membrane were larger than those on PSU membrane, which indicated the improved hydrophilicity by PSU-g-SBMA. For 48 h of filtration to soybean and diesel oil/water emulsion, the effect of PSU-g-SBMA HFM was stable and the flux could be completely recovered by cleaning. Therefore, we provided a new method for oily wastewater treatment, which can efficiently and energy-saving remove various oil substances in wastewater.

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A Review on Current Development of Membranes for Oil Removal from Wastewaters

Cited by 63 publications

References 97 publications

Functional Hydrophilic Membrane for Oil–Water Separation Based on Modified Bio-Based Chitosan–Gelatin

Functional Hydrophilic Membrane for Oil–Water Separation Based on Modified Bio-Based Chitosan–Gelatin

The Role of Electrospun Nanomaterials in the Future of Energy and Environment

PSU-g-SBMA hollow fiber membrane for treatment of oily wastewater

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