Article
Engineering, Chemical
Hengyang Mao, Wan Fan, Hongquan Cao, Xianfu Chen, Minghui Qiu, Hendrik Verweij, Yiqun Fan
Summary: The development of a self-cleaning piezoelectric ceramic membrane coupled with in-situ ultrasound functionality has shown promising results in reducing membrane fouling and improving efficiency in the treatment of suspension wastewater.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Green & Sustainable Science & Technology
Yuchuan Meng, Qiao Zhong, Yujie Liu, Zhongsen Yan, Ying Liang, Haiqing Chang, Heng Liang, Radisav D. Vidic
Summary: This study aimed to find an effective cleaning method for organic fouling in membrane distillation (MD). The fouling characteristics of humic acid (HA), sodium alginate (SA), and bovine serum albumin (BSA) were investigated, along with the cleaning efficiency of different flushing methods. The results showed that the presence of calcium ions had a varying effect on fouling for different organics. NaOH flushing resulted in irreversible fouling, while DI water flushing showed good recovery for SA-induced fouling.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Biochemistry & Molecular Biology
Yan Kee Poon, Siti Kartini Enche Ab Rahim, Qi Hwa Ng, Peng Yong Hoo, Nur Yasmin Abdullah, Amira Nasib, Norazharuddin Shah Abdullah
Summary: The anti-fouling and self-cleaning effects of TiO2/PES mixed matrix membrane were studied by using different concentrations of TiO2 photocatalyst and different durations of UV irradiation to remove humic acid. A TiO2/PES mixed matrix membrane of 3 wt.% showed the best anti-fouling and self-cleaning effect. The addition of TiO2 photocatalyst enhanced the anti-fouling and self-cleaning properties of the PES membrane.
Article
Engineering, Environmental
Boda Li, Jun Ma, Wei Qiu, Wenqian Li, Bin Zhang, An Ding, Xu He
Summary: Preoxidation-ultrafiltration process is an effective method for removing Fe2+ and Mn(2+), but the presence of Fe2+, Mn2+, and organics in the feed can cause severe membrane fouling. This study proposes a novel FeOx+MnOx+H2O2 membrane cleaning method which achieves high membrane flux recovery and removal of membrane foulants within a short time. The outstanding performance of the system is mainly attributed to the catalytic decomposition of H2O2 to generate highly reactive radicals and abundant oxygen.
Review
Chemistry, Multidisciplinary
Masoume Ehsani, Huu Doan, Ali Lohi
Summary: One of the key issues faced in membrane-based separation processes is the decline in permeate flux over time due to fouling. Ultrasonic irradiation is an environmentally friendly cleaning technique applied to prevent fouling formation or dislodge foulants on membrane surfaces. This article reviews different types of fouling, fouling evolution mechanisms, mathematical modeling, and strategies for fouling control, with a focus on ultrasound-assisted fouling control process as an innovative cleaning method. The effect of operational parameters on the performance of ultrasound-assisted filtration processes, challenges, highlights, and future outlook of ultrasound cleaning are discussed.
KOREAN JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Green & Sustainable Science & Technology
Sanghun Park, Moon Son, Jaegyu Shim, Kwanho Jeong, Kyung Hwa Cho
Summary: This study compared chemical cleaning with OBW-assisted chemical cleaning for removing organic fouling from reverse osmosis membranes. The use of OBW increased the water permeability coefficient of the fouled membrane, improving water flux by up to 10.8%. In-situ monitoring revealed that pore generation below the fouling layer helped to dissociate the fouling layer and facilitated rapid encounter between the cleaning agent and foulants. Characterization of the fouled membrane showed that applying OBW before chemical cleaning enhanced membrane cleaning efficiency.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Engineering, Chemical
Boda Li, Zhenyi Wang, Shuangqing Xia, Bin Zhang, Wenqian Li, Wei Qiu, Jun Ma, An Ding, Xu He
Summary: Natural organic matter humic acid (HA) coupled with inorganic metal oxides FeOx + MnOx can cause severe and irreversible membrane fouling. Chemical cleaning methods have limitations, but the solid alternative calcium peroxide (CaO2) provides a promising option for membrane cleaning. CaO2 can restore membrane flux dramatically and achieve outstanding cleaning performance through the oxidation of HA and the involvement of FeOx + MnOx.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Agricultural Engineering
Di Xu, Yifeng Qin, Yunqing Fang, Mingsheng Chen, Xudong Li, Junmeng Cai
Summary: The study investigated stainless steel membranes with different pore sizes for harvesting cyanobacteria. Results showed that the 2 μm membrane was preferable for practical applications due to its ability to process more filtrate volume before clogging. The pyrolysis cleaning method was found to be effective in removing foulants quickly while converting them into desirable products, but both cleaning methods could lead to pore enlargement.
BIORESOURCE TECHNOLOGY
(2021)
Article
Engineering, Environmental
Boda Li, Ziwen Han, Jun Ma, Wei Qiu, Wenqian Li, Bin Zhang, Xuedong Zhai, An Ding, Xu He
Summary: The fabrication of sodium percarbonateMnO2 effervescent tablets for membrane cleaning has been proven to be highly effective, with the ability to clean fouled membranes within 5 minutes, recovering terminal membrane flux and reducing irreversible fouling resistance significantly. The synergistic effect of MnO2 and sodium percarbonate in the tablets leads to efficient cleaning performance, showing great potential for wide practical application.
Review
Engineering, Chemical
Ting Xiao, Zehua Zhu, Lucheng Li, Jingxin Shi, Zhenxuan Li, Xiaojun Zuo
Summary: This review analyzes and compares the membrane fouling and cleaning strategies in MF/UF and DM systems, discussing the influence of factors such as membrane pore size, material, reactor configuration, and hydrophobicity on membrane fouling. Different cleaning strategies are summarized and implications for sustainable development in water and wastewater treatment are presented. This review attempts to bridge the connections between MF/UF and DM, providing new insights for fouling control and improved efficiency.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Environmental Sciences
S. A. Gokulakrishnan, G. Arthanareeswaran, Zsuzsanna Laszlo, Gabor Vereb, Szabolcs Kertesz, Jihyang Kweon
Summary: This review discusses the modification and fabrication of membranes using nanomaterials to enhance the anti-fouling properties of ultrafiltration membranes. The study also investigates fouled membrane chemical cleaning process and the adverse effects of NaOCl on polymer structure. Additionally, it reviews state-of-the-art in photocatalytic self-cleaning process and discusses future perspectives on fouling mitigation based on AOP integrated membrane technology.
Review
Polymer Science
Aysegul Gul, Jakub Hruza, Fatma Yalcinkaya
Summary: Membrane fouling is a common issue in membrane separation processes, and cleaning the membrane is crucial for improving performance. Various techniques, including physical and chemical methods, are used for membrane cleaning. Factors such as cleaning time, chemical concentration, and temperature play a significant role in determining the effectiveness of chemical cleaning.
Article
Environmental Sciences
Amine Charfi, Sewoon Kim, Yeomin Yoon, Jinwoo Cho
Summary: This paper investigates membrane fouling in DCMD treating anaerobic digestion sludge, defining an optimal cleaning strategy involving DI water flushing, sodium hypochlorite and citric acid cleaning. The study determines the optimal cross-flow velocity to avoid severe fouling and establishes that a cleaning duration of 60 minutes for each chemical cleaning every two days is the best strategy for membrane regeneration and process productivity. Additionally, the research shows that both external and internal fouling contribute to permeate flux decline in MD treating real wastewater.
Article
Engineering, Chemical
Huiru Zhang, Jinxuan Zhang, Jianquan Luo, Yinhua Wan
Summary: This study successfully prepared a visible-light-activated photocatalytic membrane for efficient production of H2O2 and Fenton-like reactions, achieving effective membrane cleaning.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Engineering, Chemical
Yuanyue Sun, Yuanfa Liu, Xitong Zhang, Wenwen Zhang, Xuan Wang, Yuemeng Yue, Jing Guo, Yue Yu
Summary: A novel CO2-responsive copolymer was successfully synthesized and used in the fabrication of a blend membrane with switchable water flux. The protonation reaction of PDEAEMA segments within the membrane pores after CO2 aeration led to pore shrinkage and reduced water flux. By taking advantage of the CO2-stimulus responsiveness, a green cleaning method using alternate aeration was adopted to clean protein on the membrane surface, achieving a satisfactory flux recovery rate comparable to traditional cleaning methods.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Chemical
Yunfei Yu, Xue Yang, Chenchen Zhang, Jie Chen, Wei Lin, Jianqiang Meng
Summary: This study reports an environmentally friendly and simple approach for preparing double-network (DN) ion gel membranes with high strength and excellent gas separation performance. By optimizing crosslinking density, mass ratio, and the type and content of free ionic liquid, the mechanical and gas separation properties of the DN membrane are improved.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Si-qi Jiang, Qiang Gao, Xi-guang Li, Chao-zhu Deng, Jun Qiu, Xiang-nan Zhu
Summary: A dual-strengthening pretreatment method is proposed to remove PVDF more efficiently and enhance the leaching of LiCoO2. Experimental results show that dual-strengthening pretreatment can effectively remove PVDF and significantly improve the leaching efficiency compared to single pretreatment methods.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Zengchi Hu, Xiaoyu Wang, Xiaohui Zhang, Xue Li, Jiangbin Xia
Summary: The rapid fabrication of high-performance composite membranes based on CMPs using simple and low-cost methods is challenging. In this study, three CMPs-based composite membranes were rapidly fabricated with adjustable size using unidirectional diffusion synthesis. The microstructural design enhanced the rejection rates of the membranes and they showed strong hydrolytic resistance, thermal stability, and acid-base resistance. Electrostatic adsorption and the adjustable microstructures significantly varied the repellence of the membranes to different charged molecules.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Farzaneh Rouhani, Matineh Ayedi, Nasser Safari
Summary: Introducing defects into porous metal-organic frameworks is important for improving their adsorption performance. Quasi-MOFs, an underutilized variant of large-scale, fundamentally deficient MOFs, have been found to have substantial amounts of unsaturated metal sites to offset the drawbacks of MOFs. In this study, a quasi-MOF was produced using a water-stable MOF and demonstrated significantly improved phosphate adsorption capability due to the presence of defect sites.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Valentin Reungoat, Morad Chadni, Louis M. M. Mouterde, Fanny Brunissen, Florent Allais, Helene Ducatel, Irina Ioannou
Summary: This study focuses on the recovery of sinapic acid using liquid-liquid extraction assisted by a hollow fiber membrane contactor from an aqueous feed obtained through the hydrolysis of mustard bran. The screening of solvents of different chemical nature showed that all tested solvents had an extraction efficiency of more than 80% for pH < 5. Four solvents were selected for use in the hollow fiber membrane contactor, and the volatile solvents showed higher mass transfer coefficients compared to non-volatile solvents. The extraction efficiency was intensified by increasing the initial concentration of sinapic acid and the feed-to-solvent ratio. CPME was found to have optimal recovery efficiency at a phase ratio of 8:1, yielding 0.9 g of sinapic acid per liter of CPME used.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Takahiro Sakamoto, Takafumi Hanada, Hayate Sato, Mayu Kamisono, Masahiro Goto
Summary: The emergence of the battery society has led to a high demand for battery metals, resulting in a strain on their supply. This study introduces a novel technique using a hydrophobic deep eutectic solvent (DES) for leaching and recovering battery metals from low-grade nickel laterite ores. The DES enables selective leaching and recovery of the metals, offering a promising pathway for the extraction of critical battery metals.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Rongrong He, Jiarui Chen, Chunyao Zhang, Dan Lu, Lin Zhang, Tao He
Summary: Researcher has developed a method to quantify the charge density in nanofiltration (NF) membrane separation layer and applied it in NF membranes that can separate Mg2+ and Li+. The results showed that overcompensated amine groups played a major role, and there was a linear relationship between charge density and coating bi-layers or PAH layers.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Zhijian Zhang, Min Chen, Zhe Lin, Zhichao Yang, Yafeng Du, Zhihui Chen, Zhenhao Yang, Kongyin Zhao, Ligang Lin
Summary: Membrane technology plays an important role in molecular/ion separation processes, but faces challenges such as membrane fouling. This study introduces a new ion-crosslinking method to fabricate copper alginate hydrogel membranes with improved mechanical strength and antimicrobial capabilities. The membranes exhibit excellent separation performance and enhanced long-term molecule/ion separation through improved anti-swelling properties. Molecular dynamics simulations and life cycle analysis highlight the pore structure and environmental friendliness of the hydrogel membranes. These findings provide valuable insights for developing sustainable hydrogel membranes with stable performance and high separation efficiency.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Dongmei Liu, Aiying Guo, Yanling Qi, Zhixin Ji, Hongjuan Li, Zhiwei Zhang, Xinyue Zhang, Kunze Wu, Aijun Cai
Summary: In this study, a stable magnetic Mg/Mn-layered double oxide-doped biochar composite (MgMnLDO-MBC) was prepared and successfully used for the removal of antibiotics and bacteria from wastewater. The composite exhibited enhanced surface areas, adsorption sites, and free radicals, leading to improved catalytic activity. The effects of different factors on the removal efficiency were evaluated, and the composite showed good reusability.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Feng Wang, Zhaoyong Bian, Yaru Zhang, Wenchao Yu, Qiang Zhang, Hui Wang
Summary: In this study, a nanofibrous layered structure of Ff-Ti3C2Tx-Co3O4 was prepared by self-assembling nanofibrous Co3O4 with lamellar fluorine-free MXene (Ff-Ti3C2Tx). The Ff-Ti3C2Tx-Co3O4 exhibited excellent catalytic activity for degradation, resistant to ionic interference, and maintained high removal efficiency of sulfamethoxazole (SMX) in municipal wastewater. The rapid SMX degradation involved fast electron transfer in redox cycles with PMS and the generation of 1O2 via PMS ->center dot O2 -> 1O2. This work provides new insights into antibiotic degradation mechanisms and electron transfer based on PMS activation.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Weipeng He, Jiacheng Luo, Yujie Wu, Tianhao Luo, Chen Tang
Summary: This study comparatively evaluated the role of cationic, anionic, and nonionic polyacrylamides (PAMs) in ballasted flocculation of clay suspensions under different aluminum sulfate (AS) coagulant dosages. The selection of PAMs and AS dosage had a significant influence on the size and shear resistance of ballasted floc aggregates.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Lixian Wang, Lizhi Zhao, Didi Si, Zhixin Li, Huiqin An, Hui Ye, Qingping Xin, Hong Li, Yuzhong Zhang
Summary: Metalloporphyrin-based nanozymes integrated with poly (vinylidene fluoride) membrane show high catalytic activity and reusability for the decolorization of Congo Red dye in continuous flow process.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Yongfei Ma, Chenyu Zeng, Yongzhen Ding, Jiayi Tang, Ondrej Masek, Zhikang Deng, Rui Mu, Zulin Zhang
Summary: In this study, sludge-derived biochar (SBC) was functionalized with various iron salts to enhance its adsorption ability for sulfamethoxazole (SMX) and magnetic collection performance. Ball milling was further employed to treat the optimal iron salt functionalized SBC (MSBC), resulting in ball milled SBC (BMSBC) with improved adsorption performance for SMX. The dominant driving mechanism for SMX adsorption onto BMSBC was confirmed to be multiple physicochemical forces, including 7C-7C conjugation, pore filling, H-bonding, Fe-O complexation, and electrostatic interactions. BMSBC exhibited favorable adsorption ability for SMX in actual waters and could be easily collected within 1 min due to its magnetic sensitivity.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Jinglin Tan, Xiaohui Mao, Wenjihao Hu, Hongbo Zeng
Summary: This study investigates the influence of PDMS chain architectures on surface properties and reveals that PDMS coatings with looped structures exhibit superior hydrophobicity, self-cleaning, and water sliding compared to coatings with linear structures. Additionally, both looped and linear PDMS coated stainless steel mesh/polyester fibers show efficient separation of oil/water mixture.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Wei-Liang Chen, Chih-Chia Cheng, Chien-Hsing Lu, Jem-Kun Chen
Summary: This study designs a novel sandwich-structured capacitor that reduces the absorption time of pollutants using dielectrophoresis force. By coating graphene oxide on polystyrene microspheres as adsorbents and encapsulating them within the capacitor, the adsorption rate is significantly enhanced. Additionally, frequency manipulation allows for the recycling of adsorbents and concentration of dyes, minimizing secondary pollution.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)