Article
Engineering, Environmental
Alexander John, Irene Carra, Bruce Jefferson, Monika Jodkowska, Adam Brookes, Peter Jarvis
Summary: The application of microbubbles in water treatment has shown to enhance gas-liquid contacting processes and compound removal compared to conventional bubbling techniques. However, this study found that there was no significant difference in hydroxyl radical generation between microbubble and conventional bubble ozonation systems.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Chemical
Mohammad Kazemi, Hamed Taghvaei
Summary: Efficient and economical methods for water recovery are in high demand due to recent water crisis caused by growing water demands. Cold atmospheric plasma technology has attracted attention for its chemical and physical effects in removing contaminants from wastewater. Experimental results with multi array dielectric barrier discharge (MADBD) plasma gas diffuser show that ozone (O-3) plays a key role in decolorization of water, with high efficiency and decolorization rate.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Environmental
Woorim Lee, Sandro Marcotullio, Hoonsik Yeom, Heejong Son, Tae-Hun Kim, Yunho Lee
Summary: This study investigated the reaction kinetics and degradation efficiency of methylparaben and its halogenated products (Cl-, Br-, Cl,Cl-, Br,Cl-, and Br,Br-methylparabens) during ozonation and UV 254 /H2O2 treatment. The results showed that ozonation and UV/H2O2 were effective in controlling the presence of methylparaben and its halogenated products.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Multidisciplinary Sciences
Qindan Zhu, Joshua L. Laughner, Ronald C. Cohen
Summary: The hydroxyl radical (OH) is the most important oxidant on a global and local scale, controlling the removal rate of primary pollutants and triggering the production of ozone. The interannual trends of OH in North American cities show significant variation, with some cities experiencing an increase while others experience a decrease. The variation of OH is linked to the decline of NO2, emphasizing the importance of controlling NOx emissions in regulating ozone pollution in these cities.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Engineering, Environmental
Anna Wang, Zhechao Hua, Chunyan Chen, Wenrui Wei, Bangjie Huang, Shaodong Hou, Xuchun Li, Jingyun Fang
Summary: This study investigated the effects of chloride on the transformation between SO4 center dot- and HO center dot in the UV/PDS process, finding that the impact on PPCP degradation varied depending on the concentration of chloride.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Yang Guo, Yixin Zhang, Gang Yu, Yujue Wang
Summary: By comparing the conventional scavenger approach with the proposed probe approach, this study found that using probes can accurately reveal catalytic ozonation mechanisms and provide an effective way to assess the contribution of various ROS to pollutant abatement.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Engineering, Environmental
Yang Guo, Juhong Zhan, Gang Yu, Yujue Wang
Summary: During ozonation, the concentrations ratios of hydroxyl radicals, superoxide radicals and ozone remain constant, indicating the potential non-negligible role of superoxide radicals in the degradation of certain micropollutants with similar or higher reactivity compared to hydroxyl radicals. The proposed chemical kinetic model accurately simulates the abatement efficiencies of ozone-resistant micropollutants by considering the contribution of superoxide radicals, providing a valuable tool for predicting micropollutant removal during ozonation.
Article
Environmental Sciences
Menglan Gao, Zhibin Jiang, Xiaobin Liao, Xingji Bai, Huan Qi, Jing Zou, Wei Cao
Summary: This study found that bromide ions (Br-) promoted the formation of carcinogenic nitroso-dimethylamine (NDMA) during ozonation of unsymmetrical dimethylhydrazine (UDMH). The formation rate constant of NDMA with Br was over 7 times higher than without Br. Additionally, increasing bromide and ozone dosages facilitated NDMA formation, while different effects were observed with the addition of bicarbonate (HCO3-) and sulfate (SO42-).
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
B. Mathon, M. Coquery, Z. Liu, Y. Penru, A. Guillon, M. Esperanza, C. Miege, J-M. Choubert
Summary: This study investigated the degradation of micropollutants in wastewater through ozonation, identifying different removal pathways and rates for various types of organic micropollutants. The research found that low and medium oxidizable micropollutants were mainly removed through indirect pathways, while high oxidizable micropollutants were eliminated through direct pathways. The model developed in the study successfully simulated the removal efficiencies of specific micropollutants in batch experiments and in a full-scale ozonation process.
Article
Engineering, Environmental
Shi-Qi Tian, Jing-Yao Qi, Yun-Peng Wang, Yu-Lei Liu, Lu Wang, Jun Ma
Summary: Biochar loaded with manganese and iron showed excellent catalytic ozonation activity, effectively removing atrazine with hydroxyl radicals as the main oxidant. The enhanced adsorption and decomposition of O-3 on the loaded biochar led to improved degradation pathways of atrazine, reducing toxicity of oxidation products significantly. This research indicates the great potential of Mn-loaded and Fe-loaded biochar for heterogeneous catalytic ozonation in water pollution treatment.
Article
Engineering, Environmental
Yunqian Song, Chun Zhao, Tuo Wang, Zheng Kong, Liushi Zheng, Haojie Ding, Yuanyuan Liu, Huaili Zheng
Summary: The novel water treatment process combining electrolysis, permanganate, and ozone showed synergistic effects in degrading various organic contaminants with less energy consumption. Increasing permanganate dosage, O-3 concentration, current density, and decreasing pH enhanced the degradation of diclofenac and other organic pollutants.
Article
Engineering, Environmental
Tomas Prostejovsky, Alena Kulist'akova, Martin Reli, Radim Zebrak, Kamila Koci
Summary: A continuous flow photochemical pilot plant unit was used to remove VOC from waste gas stream. The efficiency of the system was studied by controlling reaction conditions, detecting intermediates, and analyzing reaction products. The conversion of the model substances depends on the initial concentration of the pollutant, the flow rate, and the type of pollutant. The results showed that the highest conversion was achieved at an initial pollutant concentration of 50 ppmv and a flow rate of 100 m3 center dot h-1. The study provides insights into the degradation pathways of VOCs and presents an effective AOPs system for VOC removal.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Article
Engineering, Environmental
Yang Guo, Gang Yu, Urs von Gunten, Yujue Wang
Summary: Superoxide radicals (O-2(center dot-)) are important chain carriers in the radical chain reaction during ozonation, promoting the decomposition of ozone (O-3) to hydroxyl radicals ((OH)-O-center dot). This study used a probe compound and kinetic modeling to evaluate the role of O-2(center dot-) for O-3 decomposition during ozonation of synthetic solutions and natural waters. The results showed that O-2(center dot-) plays a critical role in promoting O-3 decomposition, with its contribution ranging from 45-70% depending on water composition.
Article
Meteorology & Atmospheric Sciences
J. M. Jenkins, G. A. Olson, P. J. McFarland, D. O. Miller, W. H. Brune
Summary: Prodigious amounts of hydroxyl radical (OH) are generated on tree leaves through corona discharges in the laboratory and during thunderstorms. The production rates depend on electric field, leaf dryness, and the presence of liquid water. Corona-generated OH may have significant impacts on atmospheric oxidation and tree and forest ecology.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2022)
Review
Engineering, Environmental
Alena Kulist'akova
Summary: The majority of current wastewater treatment technologies are ineffective in removing pharmaceutical micropollutants, resulting in their discharge into surface water bodies and causing significant harm to fragile ecosystems. The European Commission has published an expansion of legislation for surface water that includes the monitoring and limitation of the discharge of nine pharmaceuticals. Photochemical advanced oxidation processes (AOPs) have shown promise in efficiently removing micropollutants and could potentially reduce the pharmaceutical burden in wastewater. However, there are challenges that limit their widespread use in treatment plants. This review fills the gap in summarizing and assessing the current trends in the utilization of photochemical AOPs for pharmaceutical micropollutant removal in wastewater treatment, representing the first attempt to address this topic.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Engineering, Environmental
Ahmad Razali Ishak, Fauziah Shahul Hamid, Sharifah Mohamad, Kheng Soo Tay
WASTE MANAGEMENT & RESEARCH
(2017)
Article
Engineering, Environmental
Ahmad Razali Ishak, Fauziah Shahul Hamid, Sharifah Mohamad, Kheng Soo Tay
Article
Chemistry, Multidisciplinary
Abdulhadi Muftah Faraj Benrabha, Kheng Soo Tay
GREEN PROCESSING AND SYNTHESIS
(2019)
Review
Chemistry, Analytical
Decibel P. Elpa, Gurpur Rakesh D. Prabhu, Shu-Pao Wu, Kheng Soo Tay, Pawel L. Urban
Article
Environmental Sciences
S. A. Abdallah, K. S. Tay, K. H. Low
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2020)
Article
Environmental Sciences
Nur Adawiyah Mansor, Kheng Soo Tay
SCIENCE OF THE TOTAL ENVIRONMENT
(2020)
Article
Biotechnology & Applied Microbiology
Ahmad Razali Ishak, Soo Wei Khor, Sharifah Mohamad, Kheng Soo Tay
Summary: A laboratory-scale automated continuous flow leachate treatment system was developed in this study, combining coagulation-flocculation and UV-activated persulfate advanced oxidation process to efficiently reduce color, chemical oxygen demand, total organic carbon, metals, and toxicity of stabilized landfill leachates (SLL).
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Article
Chemistry, Multidisciplinary
Kheng Soo Tay, Nur Adawiyah Mansor
Summary: Tolfenamic acid is a commonly detected pharmaceutical in wastewater and the environment. Its fate in water treatment processes and the toxic by-products generated need to be studied. This research investigated the removal efficiency and toxicity of Tolfenamic acid by chlorination and UV/chlorination.
Article
Environmental Sciences
Y. T. Khoo, K. S. Tay, K. H. Low
Summary: This study presents the application of a porous graphene oxide/polycarbonate solid phase derived from upcycled e-waste as an effective adsorbent for removing sulphonamide residuals in wastewater. The adsorbent exhibited enhanced adsorptive ability towards sulphonamides due to its nest-like structure, high surface area, and improved thermal stability. The optimal adsorption conditions were determined, and the adsorption process was found to follow pseudo-second-order kinetics and Langmuir isotherms. The waste-derived adsorbent showed comparable performance in different water matrices and could be reused for up to 4 cycles, highlighting its great potential for wastewater treatment.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Environmental
Kuan Aeng Ng, Kah Hin Low, Kheng Soo Tay
Summary: The combination of UV and water-soluble Fe(III) complexes is an effective method for activating advanced oxidation processes. Fe(III)-DTPA and Fe(III)-EGTA significantly improve the rate of sulfamethazine removal in the UV/PS system. The pH range of 6 to 8 does not significantly affect the performance of UV/PS in sulfamethazine removal. The performance of Fe(III)-DTPA and Fe(III)-EGTA is comparable to that of Fe(III)-EDDS, a frequently used catalyst in UV/PS systems.
WATER ENVIRONMENT RESEARCH
(2023)
Article
Environmental Sciences
A. M. F. Benrabha, K. S. Tay
Summary: This research developed a simplified method for preparing magnetic sorbent for dispersive solid phase micro-extraction (DmSPE) using poly(4-vinylphenol) (PVP). The PVP@MNP sorbent showed low detection and quantification limits, wide linearity range, good recovery, and was effectively used for analyzing Hg2+ in various types of water samples. The study also demonstrated the reusability of PVP@MNP.
GLOBAL NEST JOURNAL
(2021)
Article
Engineering, Chemical
Saidu Akun Abdallah, Kheng Soo Tay, Kah Hin Low
Summary: This study demonstrated that waste-derived aminated polycarbonate could serve as a potential adsorbent for mercury treatment in contaminated water, showing high efficiency in mercury removal.
DESALINATION AND WATER TREATMENT
(2021)
Article
Multidisciplinary Sciences
Ahmad Razali Ishak, Sharifah Mohamad, Kheng Soo Tay
MALAYSIAN JOURNAL OF FUNDAMENTAL AND APPLIED SCIENCES
(2019)
Article
Chemistry, Analytical
Soo Wei Khor, Yean Kee Lee, Kheng Soo Tay
Article
Chemistry, Applied
Nurul Yani Rahim, Kheng Soo Tay, Sharifah Mohamad
ADSORPTION SCIENCE & TECHNOLOGY
(2018)
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)