Article
Engineering, Chemical
Juntao Zhu, Xuchen Ba, Xiaobin Guo, Qi Zhang, YuanFeng Qi, Yifan Li, Juan Wang, Haofen Sun, Bo Jiang
Summary: This study reveals the interference of electrochemically generated toxic oxychlorides on COD determination and the influence of different cathode materials on COD removal efficiency in treating saline wastewater.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Review
Chemistry, Physical
Riham K. Ahmed, Engy M. Saad, Hussein M. Fahmy, Rasha M. El Nashar
Summary: The design of experiments is crucial for optimizing operating conditions and obtaining adequate results, especially in the fields of pharmaceuticals, food, and environmental analysis. Electrochemical sensors, as fast and reliable tools, have wide applicability in various fields.
CURRENT OPINION IN ELECTROCHEMISTRY
(2022)
Article
Environmental Sciences
Nguyen Tien Hoang, Tran Duc Manh, Vo Thang Nguyen, Nguyen Thi Thy Nga, Fredrick M. Mwazighe, Bui D. Nhi, Hien Y. Hoang, S. Woong Chang, W. Jin Chung, D. Duc Nguyen
Summary: This study investigated the degradation of methylene blue (MB) using a UV/chlorine process and its combination with other advanced oxidation processes. The results showed that the primary reactive species were hydroxyl radicals and reactive chlorine species, and the degradation rate of MB was influenced by pH. Humic acid and chloride ions inhibited the degradation, while bicarbonate ions increased the rate. The combination of UV/chlorine/electrochemical oxidation significantly improved the degradation rate, while the combination of UV/chlorine/H2O2 decreased the rate. The energy cost of UV irradiation was the main cost in MB treatment.
Article
Engineering, Environmental
Ye Sun, Zhiyuan Zhao, Hailong Tong, Baiming Sun, Yanbiao Liu, Nanqi Ren, Shijie You
Summary: This study presents a machine-learning-based framework for the inverse design of the electrochemical oxidation process for water purification. The XGBoost model achieved excellent performance in predicting the reaction rate (k), with an R (ext) (2) of 0.84 and RMSEext of 0.79. The most influential parameters for inverse design were identified as current density, pollutant concentration, and gap energy (E (gap)). This research provides a paradigm shift towards a data-driven approach for advancing the research and development of electrochemical water purification.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Jooho Park, Sun-Kuk Kwon, Jung-Eui Lee, Youngjo Kang, Joo Hyun Park
Summary: The effect of blown oxygen on the competitive removal of impurities from liquid copper was studied at a temperature of 1673 K. Oxygen blowing can effectively separate silicon and iron impurities, the dominant impurities in molten copper, into the slag. The interfacial area for oxidation of impurities was estimated by considering bubble and cavity formation for both top-blowing and bottom blowing methods. The kinetic model based on liquid phase mass transfer of impurities was verified to be valid for understanding the competitive removal of impurities from liquid copper through comparisons between experimental and theoretical results.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Chemical
Jiaxin Tong, Zhiping Zhu, Yusi Yang, Yuankang Jiang
Summary: An electrochemical treatment device was designed to condition EDTA cleaning wastewater, and the best COD removal efficiency was obtained through experiments with four different parameters. A model was established based on the experimental results to determine the optimum conditions for COD removal efficiency.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Biochemistry & Molecular Biology
Khanh-Chau Dao, Yung-Pin Tsai, Chih-Chi Yang, Ku-Fan Chen
Summary: This study proposes a method to simultaneously remove CBZ and phosphate from the effluent of a moving-bed membrane bioreactor using an electrochemical process. The experimental results show that this method can achieve high removal efficiency under suitable conditions.
Article
Environmental Sciences
Abideen Idowu Adeogun, P. B. Bhagawati, C. B. Shivayogimath
Summary: Response surface methodology and artificial neural network were utilized to model the electrocoagulation process for removing pollutants from pulp processing wastewater. The study found that under optimal conditions, removal efficiencies for COD, TDS, and Turbidity were 76.4%, 57.0%, and 97.13% respectively, with potential for sludge utilization as adsorbent and metal recovery.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Engineering, Aerospace
Apostolos Spanelis, Alastair Duncan Walker
Summary: This paper presents a simple methodology to parametrically design, explore and optimize engineering systems involving fluid off-takes and complex delivery ducts at low cost. Nine input variables are explored using a fractional factorial design approach, and numerical predictions based on multiple aerodynamic objectives are characterized. A selection of trade-off geometries is determined using a scalarization technique, and their robustness is assessed to guide the next conceptual design iteration.
Article
Chemistry, Multidisciplinary
Wei Zhang, Mengdi Zhang, Jiming Yao, Jiajie Long
Summary: Direct current (DC) electrocoagulation is effective in decolorizing indigo dyeing wastewater but has low chemical oxygen demand (COD) removal rate and high energy consumption due to electrode corrosion. To improve COD removal rate and reduce energy consumption, a peroxi-alternating current (AC) electrocoagulation (EC) system was developed. The study focused on the effects of power type, electrode combination, and process parameters on COD removal rate and decolorization rate, and investigated the COD degradation mechanism. Results showed that AC electrocoagulation enhanced floc adsorption capacity and achieved a COD removal rate of 51.19%. The coupled peroxi-AC electrocoagulation system further removed sulfite and residual dyes, reaching COD removal and decolorization rates of 78.09% and 98.47%, respectively. The system also had significantly lower energy consumption compared to DC electrocoagulation, with a reduction of 70%. Overall, the peroxi-AC EC system is an effective method for reducing COD concentration in indigo dyeing wastewater.
ARABIAN JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Physical
Yuri Bedjanian
Summary: In this study, the kinetics of the reaction between hydroxyl radicals and HBr were investigated using various methods, and a temperature-dependent rate constant expression was determined. The results provide an experimental dataset for atmospheric and combustion chemistry modeling.
JOURNAL OF PHYSICAL CHEMISTRY A
(2021)
Article
Environmental Sciences
Qiang Leng, Shiming Xu, Xi Wu, Sixue Wang, Dongxu Jin, Ping Wang, Debing Wu, Fujiang Dong
Summary: This study investigated the application of a reverse electrodialysis reactor (REDR) in treating synthetic methyl orange (MO) dyeing wastewater. The effects of operation parameters on the chemical oxygen demand (COD) removal efficiency were explored and a mathematical model was developed to predict the variation of COD removal efficiency with treating time under different conditions. The results showed that increasing the fluid velocity and rinse solution flowrate improved the COD removal efficiency and reduced the total energy consumption of the REDR.
ENVIRONMENTAL RESEARCH
(2022)
Article
Electrochemistry
Renato Montenegro-Ayo, Tzayam Perez, Marcos R. V. Lanza, Enric Brillas, Sergi Garcia-Segura, Alexsandro J. dos Santos
Summary: This paper presents the performance evaluation of a novel pre-pilot reactor design using boron-doped diamond (BDD) anode for electrochemical oxidation of emerging pollutants. The reactor's engineering capabilities were assessed using turbulent flow simulation and secondary current distribution modeling. Different medium conditions were tested to determine the degradation efficiency of the reactor towards the model pollutant, ciprofloxacin (CIP). The study showed that the reactor achieved almost complete mineralization of CIP, with the majority of its nitrogen converted into nitrate.
ELECTROCHIMICA ACTA
(2023)
Article
Engineering, Chemical
Jiaxin Tong, Zhiping Zhu, Mingpeng He, Pan Zhou, Yuankang Jiang, Zhenggang Wang
Summary: The study investigated the electrochemical degradation kinetics of cleaning wastewater containing EDTA and found that factors such as initial pH, electrode distance, current density, supporting electrolyte concentration, and H2O2 concentration greatly affect the degradation efficiency. Single-factor experiments showed that acidic pH and small electrode distance are beneficial, while high current density or excessive H2O2 concentration can reduce oxidation efficiency. Optimization was achieved at specific conditions with degradation constants determined.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Chemistry, Physical
Odile Capron, Luis D. Couto
Summary: This paper presents an innovative and efficient methodology for determining the solid-state diffusion coefficient in electrode materials with phase transitions. The methodology includes unsupervised machine learning and a physics-informed algorithm for numerical simulations. The results show the dependency of the diffusion coefficient and reaction rate constant in NVPF electrode during sodiation. The methodology is innovative, efficient, and applicable to electrochemical models in any programming language.
