Membrane Filtration Research Articles

Efficient Separation of Oil/Water by a Biodegradable and Superhydrophobic Composite Based on Loofah and Rice Straw

Membrane filtration is one of the preferred choices for petroleum wastewater disposal due to its simplicity and low energy consumption. In this paper, a biodegradable superhydrophobic membrane based on loofah and rice straw (LF-RS) was prepared and modified with dodecyltriethoxysilane to improve its stability, morphology, and performance. The membrane showed an efficiency of 99.06% for oil/water separation with an average water flux of 2057.37 Lm−2h−1 and a tensile strength of 11.19 MPa. The tensile strength of the LF-RS membrane was 322.47% higher than that of the PVDF membrane and 126.58% higher than that of the commercially available nitrocellulose membrane. Through molecular simulations, we showed a 96.3% reduction in interaction energy between water and membrane post-modification, which is beneficial for increasing the contact angle and separation performance. This study provides an option for the large-scale, cost-effective fabrication of eco-friendly membranes for pollutant removal.

An overview of deploying different treatment processes with membrane bioreactor for enhanced treatment of wastewaters: synergistic performances and reduced fouling of membrane.

The membrane bioreactor (MBR) process synergistically combines biological treatment with membrane filtration, offering a compact design and enhanced operational flexibility. However, membrane fouling remains a critical bottleneck, limiting its widespread application, particularly in treating high-strength wastewater. Recent advances have demonstrated that integrating MBR systems with auxiliary processes such as adsorption, electrochemical treatments, algal-assisted systems, and others can significantly mitigate fouling and enhance treatment efficacy. This paper critically reviews various MBR hybrid configurations, examining their mechanisms, advantages, and limitations in terms of treatment performance and fouling control, while highlighting their potential to extend conventional MBR's applicability to challenging wastewaters and addressing operational challenges like economic viability and sustainability. Elaborated tables incorporating a wide variety of research studies within the realm of synchronization have been meticulously compiled to generate a comprehensive literature review.

Effect of sampling face velocity on the ultrafine particle surface collection efficiency of a cellulose membrane filter and a cellulose-glass fiber filter for environmental airborne radioactivity monitoring.

Surface collection efficiency (SCE) of a cellulose membrane filter (CMF) and a cellulose-glass fiber filter used in environmental monitoring for alpha-emitting radionuclides from nuclear facilities and natural radioactivity sources was evaluated for particles in the size range of 0.03-0.1μm at different levels of face velocity. The SCE of the CMF was higher than that of the cellulose-glass fiber filter, and only the membrane filter showed the dependence of SCE on the particle size at higher face velocity. The use of the CMF at higher face velocity in environmental radioactivity monitoring leads to measurements of the background alpha spectrum with more degradation under the changing particle size condition in the atmosphere. Consequently, that fact needs to be taken into account, along with the expected particle size distribution and concentration of the airborne radioactivity being sampled, when selecting a face velocity to achieve the best possible detection limit.

Assessment of Antibiotic Resistance in Groundwater Bacterial Strains: A Community-based Study

Background: The microbial quality of private and community water supply from groundwater is mostly not monitored nor assessed by any established government agencies in Nigeria. Contamination by pathogenic and antimicrobial resistant microbial agent, and the potential of resistant genes transfer from environmental bacteria to human pathogens is a major risk for public health in these water systems. Aim: This study was aimed at evaluating the microbiological quality and safety in terms of antibiotic resistance bacterial profile of groundwater sources in a typical peri-urban settlement in Nigeria. Methodology: Bacterial contaminants were isolated by membrane filtration technique, characterized and analyzed using standard microbiological approach. Results: A total of 22 and 8 Gram negative and positive bacteria respectively were isolated. The isolates comprised 7 bacterial genera with Klebsiella and Enterobacter species having the highest incidence of 20% respectively, followed by Bacillus (17%) and least being Shigella with 7% incidence. All the isolates were 100% resistant to cefotaxime, followed by 76.7% and 73.3% resistant to vancomycin and meropenem respectively. The least resistance of 3.3% was against ciprofloxacin. Resistance in borehole storage tank water was highest (80%) against vancomycin followed by 70% for meropenem, while 75% resistance was against vancomycin and meropenem respectively in the well water, Seventy-three percent (73%) of the isolates showed multidrug resistance (MDR) pattern, and a multiple antibiotic resistant index (MARI) ≥ 0.3. Conclusion: The results of this study suggest that groundwater source in the studied community is contaminated with antibiotic resistant bacteria and underscores the public health implication and concern for monitoring of groundwater supply in Nigerian communities.

GESTÃO SUSTENTÁVEL DE RESÍDUOS NA INDÚSTRIA DE LATICÍNIOS: ESTRATÉGIAS PARA O REAPROVEITAMENTO DO SORO DO LEITE

Whey, one of the main by-products generated during the production of cheese and other dairy products, has a rich composition that can be transformed into relevant resources. In this context, various technologies, such as membrane filtration, microfiltration, ultrafiltration, nanofiltration and reverse osmosis, are suitable for separating and concentrating important components, such as proteins and lactose, from whey. In addition, spray-drying transforms whey into high value-added products, while anaerobic digestion allows waste to be converted into biogas, promoting the generation of renewable energy. Reviewing the approach to integrating these technologies not only reduces the environmental impact of the dairy industry, but also contributes to economic efficiency, promoting a circular economy. The article concludes that adopting these practices is essential to ensure a sustainable future for the sector, benefiting both the industry and the environment.

Screening of municipal effluents with the peroxidase toxicity assay

AbstractThe peroxidase (Per) reaction is a quick and inexpensive biosensor for the screening of environmental contaminants and wastewaters. The purpose of this study was to screen various municipal wastewaters before and after 7 different types of treatment processes using this sensor to identify potential sites under stress by urban pollution. The following wastewater samples before (influent) and after the commonly applied treatments (effluent) were tested using the Per activity test: advanced biofiltration, biofiltration, aerated lagoons, secondary aeration sludge, trickling filter, secondary membrane filtration, and primary. The influents and effluents were collected for 3 days and concentrated to 500 X on a reverse-phase (C18) extraction cartridge. The ethanol extracts were examined for dissolved organic carbon, plastic-like materials, polyaromatic hydrocarbons and polystyrene nanoplastics. The samples were then tested using the Per reaction alone and in the presence of DNA to detect DNA binding agents. The results show that population size tended to increase Per activity and 60% of the effluents decreased Per activity leading to H2O2 persistence and toxicity. More advanced treatments (biofiltration, membrane biofiltration, secondary aeration) produced stronger changes from the corresponding untreated influents corroborating their performance in reducing toxicity. The addition of DNA during the Per reaction revealed that population size had no influence and that 60% of treated effluents restored Per activity suggesting release of genotoxic compounds in the aquatic environment from treated wastewaters. The toxic implications of the continuous release of wastewaters in aquatic ecosystems are discussed in the light of emerging contaminants such as nanoplastics.

Oxygen vacancies-enriched spent lithium-ion battery cathode materials loaded catalytic membrane for effective peracetic acid activation and organic pollutants degradation

Advanced oxidation processes combined with membrane filtration technique offer a promising approach for pollution mitigation and catalyst recovery. Herein, a waste ternary lithium-ion battery cathode material of LiNixCoyMnzO2 (LNCM) loaded polytetrafluoroethylene (PTFE) membrane was synthesized for peracetic acid (PAA) activation (LNCM-PTFE/PAA) and 2,4,6-trichlorophenol (TCP) degradation. Such a novel membrane, with a catalyst loading of 10 mg (0.796 mg/cm2) of LNCM achieved 96.4 % removal of TCP (2 mg/L) within 20 min in neutral pH. The redox cycles of surface metals (such as Co3+/Co2+, Ni3+/Ni2+, and Mn4+/Mn3+/Mn2+) in spent LNCM efficiently enhance charge transfer and mediated PAA activation. And intrinsic oxygen vacancies in LNCM facilitated PAA adsorption and its cleavage. The resulting carbon-centered radicals (R-C•, CH3C(O)OO•) and 1O2 are identified as the primary reactive species that collaboratively participate in TCP degradation. Quantitative structure-activity relationship analysis demonstrated a substantial reduction in product toxicity. The successful practical application of the LNCM-PTFE/PAA membrane was exemplified by treating chlorophenol industrial wastewater. This study presents a new LNCM-PTFE/PAA catalytic membrane for high-efficiency water treatment and a novel perspective for green utilization of waste LNCM.

Emerging breakthroughs in membrane filtration techniques and their application in agricultural wastewater treatment: Reusability aspects

Freshwater resources are becoming limited and are rapidly getting polluted due to industrialization and urbanization. Water pollution is a pervasive global challenge both in terms of scarcity and quality. Among other sources, wastewater discharged through agricultural practices are major contributor to environmental pollution. The leading cause of contaminants is the runoff of fertilizers, herbicides, insecticides and animal waste into waterbodies. Conventional treatment methods efficiently remove large particles, organic matter, and nutrients but require extensive infrastructure and produce significant sludge. In contrast, membrane filtration offers superior purification and reuse potential by using semi-permeable membranes to selectively remove contaminants, including suspended solids and dissolved ions. This study examines membrane filtration principles and technologies, emphasizing their role in delivering high-quality effluent for discharge or reuse. The study identifies fertilizers, herbicides, and insecticides as major agricultural contaminants and highlights conventional techniques' ineffectiveness in achieving high purification levels. Membrane filtration effectively remediates a wide range of pollutants, but fouling remains a challenge, addressed by antifouling agents and advanced membrane materials in hybrid processes. The study concludes by highlighting the reusability aspect of membrane filtration in agricultural systems and the potential applications of reclaimed water. This study emphasizes the need for advanced membrane materials and integrated systems for effective utilisation of membrane filtration.

Comparison of liquid and filter sampling techniques for recovery of Bacillus spores and Escherichia coli from environmental water

Historically, detecting water contamination has involved collecting and directly analyzing liquid samples, but recent advances in filter sampling methods offer numerous potential advantages. Emerging technologies, including environmental DNA (eDNA) samplers, could be used for remote microbial contamination sampling, but work is needed to determine if target microorganisms can be recovered from filters at comparable levels to traditional sampling methods. In this study, Escherichia coli and a surrogate for Bacillus anthracis spores were sampled from synthetic stormwater and quantified using both direct liquid and filter methods, and dwell time tests compared microorganism persistence in water and on filters. At nearly all tested timepoints, the recoveries of spores from membrane filters were within 0.5 log10 colony forming units per sample (CFU/sample) compared to the liquid-only samples, suggesting that the use of filter sampling is a feasible alternative to liquid-based sampling, and samples were held for up to 4 weeks without significant sample degradation. Recoveries for E. coli remained relatively consistent for ∼3 days in phosphate buffered saline (PBS), in synthetic stormwater, and on membrane filters, but decreases in recoveries were observed for samples held for >3 days. These results indicate that emerging water sampling technologies, which reduce logistical burdens and offer potential cost savings, can be leveraged to characterize biological contamination in water matrices with multiple types of microbiological agents.

A new co-production (biogas& biodiesel) plant under a microalgae-to-biofuel process designed under a hydrothermal disintegration/ deep eutectic solvent process

Microalgae-to-biofuel process can be introduced as one of the promising alternatives to non-renewable resources due to its outstanding advantages. However, the industrial feasibility of employing deep eutectic solvents (DESs) for pretreatment of microalgae remains a relatively uncharted territory, which had been acknowledged as a noteworthy research gap in the literature. The purpose of the article is to develop life cycle and energetic analyzes of a co-production (biogas& biodiesel) plant under a microalgae-to-biofuel process. The proposed biofuel production process is based on a hydrothermal disintegration (HD)/DES cycle. An in-depth analysis and comparison between HD/DES of microalgae for the concurrent production and the conventional HD process is developed. Additionally, the effectiveness of recrystallization and membrane filtration for DES recovery was developed. Finally, the sensitivity analyses, focusing on variables like lipid recovery, DES usage quantity, the efficiency of DES recovery, and biogas yield, are provided. When compared to traditional HD, the incorporation of DES during HD led to a substantial 36.8% improvement in energy output. However, this came at the cost of higher energy input, resulting in a rise in ratio of net energy by 28%, primarily due to the energy-intensive nature of DES synthesis. Additionally, the introduction of DES contributed to a slight increase in overall released GHG, from -25.86 to 25.72g CO2 (eq.) per MJ. Notably, a combination approach involving both membrane filtration and recrystallization yielded promising results, achieving a low ratio of net energy of 0.46 and even negative overall released GHG. The sensitivity analyses findings emphasized the need for reducing energy utilization in DES synthesis and addressing more energy-efficient recovery processes to further enhance the HD/DES process's environmental performance and energy efficiency. This study provides valuable insights into optimizing the co-production plant under a microalgae-to-biofuel process through HD/DES, highlighting avenues for sustainability improvements in this promising approach.

FEM Analysis on Isotropic Consolidation of Unsaturated Soils Using Ceramic Disks and Microporous Membrane Filters for Suction Control

Abstract Microporous membrane (MM) filters with a significantly thin thickness have recently been used as an alternative to ceramic disks for matric suction control in the axis-translation technique for element tests on unsaturated soils. Although researchers have highlighted some discrepancies in test results when ceramic disks and MM filters are used, the mechanism leading to these discrepancies has not yet been clarified. In this study, suction-controlled triaxial tests were first conducted on unsaturated completely decomposed granite using two filters. Then, it is natural to believe that the different thicknesses of ceramic disk and MM filters may significantly influence the suction equilibrium process of specimens. To clarify this issue, soil-water-air coupled finite element modeling was performed to simulate the consolidation process in triaxial tests as an initial/boundary value problem. In the numerical calculation, the influence of the void ratio on the water retention curve (WRC) of soil was properly considered by adopting a deformation-dependent WRC model. In particular, the ceramic disk and MM filter, along with the specimens, were modeled, and their differences in thickness were considered. The calculated results show that a nonuniform distribution of suction occurred in the ceramic disk, leading to greater drainage discharge of the specimens. In other words, the influence of the thickness difference between the MM filter and ceramic disk cannot be neglected. However, regardless of whether ceramic discs or MM filters are used, the uneven distribution of the state variables in the specimens may occur in the triaxial tests for unsaturated soils, which emphasizes the importance of assessing the soil tests using the present axis-translation technique as initial/boundary value problems.

Adjusting Oxidation Pathways via Fine-tuning Atomic Ratios in Window-opening MO0F Membranes for Efficient Self-cleaning

Peroxymonosulfate (PMS) can be used as a green oxidant to mitigate catalytic membranes fouling and restore filtration performance through advanced oxidation processes (AOP). However, the adjustment of oxidation pathways and the understanding of underlying mechanisms for efficient cleaning without sacrificing the filtration performance need to be studied systematically. We optimized the membranes microenvironment via thermal modification from 25 °C to 400 °C below the catalyst ZIF-8 framework's decomposition temperature. The modified membranes have a doubled pure water flux (158.3 LMH bar−1) and remain rejection rates due to intact ZIF-8 framework structure with “window-opening” effect. The methyl dissociation and self-catalyzed graphitization were regulated by changing temperature, resulting in adjustable nonradical pathway proportion (correlated with the C/Zn atomic ratio at 0.96). The enhanced nonradical pathway targeted attacks on electron-rich regions of organic compounds, resulting in efficient cleaning and almost complete flux recovery (99.3%). The theoretical simulations revealed that methyl groups dissociation and graphitization significantly influence the electron density and adsorption energy at active sites for tunable oxidation pathways and enhanced catalytic performance. Our work offers a rational strategy to improve both filtration and catalytic performance in catalytic membranes. The enhanced understanding of oxidation mechanisms guides the design of designing efficient AOP membrane cleaning systems.

Polydopamine-incorporated MOF membrane with hydrophilicity for effective oil/water separation and fouling-resistant model analysis and prediction

A large number of oil spills and oily wastewater are discharged, in the modern industrial production process, resulting in serious water pollution. Oily wastewater can be extremely harmful to ecosystems and human health. Oil-water separation has become a major challenge at present, and membrane separation has aroused more and more concern in recent years due to its high economic efficiency. This paper fabricated PES filtration membranes using the novel nanoparticlesbased on both metal–organic frameworks-5 (MOF-5) and polydopamine (PDA) layers as dopants, and then adequately explored the porosity, morphology, separation, hydrophilicity, and fouling-resistant performance of the resultant membranes. In addition, the prepared membranes were used for oil–water separation, including soybean-in-water, petroleum ether-in-water, and gasoline-in-water emulsions. MOF@PDA membranes exhibit high separation efficiency of up to 99.8%. Subsequently, membrane fouling mechanisms were investigated using the Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory, and the molecular mode of interaction with the three oil–water emulsions with the membrane was compared. Newly prepared MOF@PDA membranes have better stability, fouling-resistant, and self-cleaning properties. Finally, an optimal machine learning model for oil–water separation efficiency was developed with a high prediction accuracy of 98%. The obtained results indicate that mixed matrix membranes exhibit excellent oil–water separation performance, demonstrating great application prospects in the remediation of oily wastewater.

Fine-tuning CO2 separation of mixed matrix membranes by constructing efficient transport pathways through the addition of hybrid porous 2D nanosheets

Fine-tuning CO2 separation of mixed matrix membranes by constructing efficient transport pathways through the addition of hybrid porous 2D nanosheets

Effects of biological activity and feed water characteristics on the flux stabilization of gravity-driven membrane: Perspectives from biocake structure and mass balance

Gravity-driven membrane (GDM) filtration could be operated without any cleanings, has captured increasing attentions in decentralized drinking water treatment. However, the mechanism of flux stabilization during GDM long-term filtration was not comprehensively understood. This study aimed at elucidating the mechanism of flux stabilization in GDM process from the perspective of biocake layer structure and organic mass balance. The results revealed that bacteria played the fundamental role in flux stabilization and level of GDM by both engineering a rough and heterogeneous structure of biocake layer, and also hydrolyzing the organic matters on the membrane surface to maintain the dynamic balance of total organics in biocake layer. Furthermore, protozoa & metazoa would not influence the flux stabilization of GDM, but benefited to improving the stable flux level (from 4.51 L m−2h−1 to 8.68 L m−2h−1) by engineering a more porous and permeable biocake layer through the bio-predation. Regarding non-biodegradable organics (e.g., humic substance), it could be hydrolyzed into low-molecular organics to penetrate the membrane to reduce organics accumulation in the biocake layer, and achieved the mass balance, resulting in flux stabilization (7.54 L m−2h−1). However, easily biodegradable organic (e.g., sodium acetate) would promote excessive microbial growth and EPS secretion, leading to a relatively lower stable flux of GDM system (5.75 L m−2h−1). Therefore, the flux stabilization of GDM process was determined by the biological action-based dynamic balance of both the structural properties and organic mass in the biocake layer. Overall, these findings will be beneficial to promote GDM extensive application in the complex decentralized water supply.

Preparation of salt-free Pleurotus eryngii protein with enhanced colloidal stability and emulsifying properties by ceramic membrane filtration

Fungi proteins represent a potential alternative to animal proteins, which are regarded as a prospective source of edible proteins due to more sustainable and efficient cultivation of fungi. Nevertheless, the extraction of fungi proteins typically involves alkali extraction combined with acid precipitation (AEAP), yielding considerable amounts of salt that causes aggregation and inferior functional properties of proteins. In this study, we put forward a novel extraction method by direct filtration of Na+ and OH− from the alkaline extraction solutions using ceramic membranes. This method enabled the continuous, efficient and cost-effective production of Pleurotus eryngii protein (PEP). The PEP prepared by this technology featured a uniform distribution of nanoparticles (∼129.5 nm) with higher water dispersity, colloidal stability and surface active properties as compared to that prepared by the AEAP method. Moreover, the microstructures of PEP can be tailored with various nanoparticle sizes and size distribution profiles, allowing for the adjustment of long-term stabilities and surface activities. Our study renovated the production technology of fungi proteins to enhance their functionalities as well as the application prospects in the future food industry.

Dual-layer coated photocatalytic membranes for surface water treatment: Insight of membrane fouling restriction

The combination of carbon-based material adsorption and photocatalytic oxidation is a crucial approach to eliminate natural organic substances and mitigate membrane fouling induced by them. In this investigation, Bi2O3-TiO2 (BT) was incorporated with three varieties of carbon-based substances (such as powdered activated carbon (PAC), ordered mesoporous carbon CMK-3 (OMCs), and carbon nanotubes (CNTs)) and employed as a dual-layer coating on the surface of the ultrafiltration membrane to reduce membrane fouling induced by natural organics during the treatment of actual water bodies. Under light conditions, the BT/CMK-3 coating outperforms BT/PAC and BT/CNTs coatings in reducing membrane fouling, with a flux recovery rate of up to 80.4 % and an irreversible fouling rate as low as 19.5 %, while also improving the removal rates of UV254 and DOC to 55.2 % and 77.9 %, respectively. Based on the analyses of three-dimensional fluorescence PARAFAC and liquid chromatography, the BT/CMK-3 coating efficiently removes humic substances and protein-like compounds via adsorption and photocatalytic oxidation, achieving a 24.1 % removal rate of humic acid and a 93.7 % removal rate of low molecular weight neutral substances. Under the synergy of CMK-3 adsorption and BT photocatalytic oxidation, reactive oxygen species effectively degraded and transformed the membrane foulants enriched by CMK-3, reducing and increasing the Zeta potential and free energy on the membrane surface to −4.2 mV and 15.1mJ/m2, respectively. The interaction force between the foulant and the membrane changed into a repulsive force, and the fouling mechanism changed from complete blockage to intermediate blockage, thereby shortening the transition time. This advancement provides significant promise for the development and broader application of photocatalytic membrane filtration technology.

Developing zirconium xerogel coagulants for deep removal of phosphorous

Deep removal of phosphorous (P) from water is a necessary measure to solve the eutrophication problem. Coagulation is both a basic treatment method for P removal and an important pretreatment process for membrane filtration. However, few coagulants can meet the both requirements. Based on the analysis on the hydrolysis behaviors of some earth-abundant metals and the solubility products of their phosphates, a series of zirconium xerogel coagulants (ZXC) was fabricated with a novel approach (the sol-gel method) and was evaluated for the removal of both organic and inorganic P in coagulation and coagulation-ultrafiltration. In terms of P removal and anti-fouling of membrane, the resultant ZXC outperformed polyzirconium chloride (PZC), polyaluminum chloride (PAC), polyferric sulfate (PFS), as well as titanium xerogel coagulant (TXC) in a wide range of pH and dose. The rapid hydrolysis of Zr4+ and the formation of Zr3(PO4)4 with a rather low solubility product are attributable to the great performance of ZXC in coagulation. This study highlights the potential of ZXC as an effective solution for enhancing the treatment of water and wastewater, particularly in achieving deep P removal and improving membrane fouling resistance, thereby contributing to more sustainable and efficient strategies for addressing eutrophication and pollutant removal.

Ferroelectric ultrafiltration membrane with improved antifouling performance

Although membrane technologies for water purification have been widely applied over decades, membrane fouling remains an inherent challenge in the membrane filtration process. Improving the hydrophilicity or surface charge of the membrane is an effective approach to mitigate membrane fouling. Here, a ferroelectric composite ultrafiltration membrane was fabricated by incorporating dopamine modified BaTiO3 nanoparticles into poly(vinylidene fluoride) (PVDF) membranes and then charged by corona poling (p-BTO/PVDF). The water permeability of p-BTO/PVDF membrane (195.0 ± 10.5 L m-2 h−1 bar−1) was increased by 2.2 times compared to the pristine PVDF membrane. The enhanced hydrophilicity and surface potential based on ferroelectric charges promoted the formation of the hydration layer on the membrane surface and increased the electrostatic repulsion against the pollutants, thus decreasing the filtration resistance and enhancing the antifouling performance of the membrane. The water recovery efficiency of the ferroelectric membrane reached 98.2 %. Furthermore, the ferroelectric membrane showed excellent antifouling stability. This work proposes an effective and environmentally friendly strategy for using ferroelectric polarization to regulate membrane anti-fouling.

МЕМБРАННАЯ ОЧИСТКА ОБВОДНЕННОГО ТОПЛИВА

A promising way to solve the problem of waterlogging of motor fuel may be the use of modern filter materials. Membrane filters are widely used in various technological processes. They are capable of working for a long time, are quite durable and chemically resistant. The possibility of using membrane materials in the purification of artificially watered diesel fuel has been investigated. For the analysis of membranes, an installation has been designed that allows fuel to be pumped through the test material at different pressures. The pressure is created without using a pump, but due to compressed air from the compressor unit. As a filter material, Vladipor flat synthetic membranes of the MFFK-3, MFFK3G brands and watered diesel fuel with a water content of 0.5%, 1%, 3% and 5% were used (the volume of the initial fuel sample was 1 liter). The water content in the initial diesel fuel was calculated according to the Dean-Stark method. It was found that with increasing pressure, the degree of purification of the watered fuel by the hydrophobic membrane MFFK-3 increases (improves by 45-70%), in the case of the hydrophilic membrane MFFK-3G decreases (10-14%). The hydrophobic membrane with minimal water content (0.5%) allowed to reduce the water content in the initial fuel sample from 5 ml to 0.25 ml (by 95%), hydrophilic from 5 ml to 4.25 ml (by 15%). The water residue in the permeate after the hydrophilic membrane is significantly higher. The studied membranes of the MFFK-3 and MFFK-3G brands are capable of purifying diesel fuel from water when used as a fine filter.