Article
Engineering, Environmental
Mehmet Kobya, Philip Isaac Omwene, Sanaz Mohammadzadeh Sarabi, Sadullah Yildirim, Zubeda Ukundimana
Summary: Phosphates, major contributors to eutrophication and algal blooms, were successfully removed from sludge centrate effluent using packed-bed electrocoagulation with iron, aluminum, and aluminum-iron hybrid scrap anodes. High phosphorus removal efficiencies were achieved under optimized operating conditions, with corresponding costs calculated for each type of scrap metal. Metal-phosphorus precipitation and adsorption were identified as key mechanisms for phosphorus removal in this study.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2021)
Article
Engineering, Environmental
Locksley F. Castaneda, Oscar Coreno, Jose L. Nava
Summary: This paper investigates the simultaneous removal of arsenic, fluoride, and hydrated silica from natural well water using electrocoagulation. The best results were achieved at a current density of 5 mA cm-2 and a linear flow velocity of 1.2 cm s-1. This method effectively reduced the concentrations of arsenic and fluoride below the World Health Organization's guideline and maintained a hydrated silica concentration of 33 mg L-1.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Article
Energy & Fuels
Locksley F. Castaneda, Oscar Coreno, Gilberto Carreno, Jose L. Nava
Summary: This study investigates the application of electrocoagulation technology for the removal of arsenic, fluoride, and hydrated silica from underground water. By analyzing the influence of the mean linear flow velocity and current density in the electrocoagulation system, it was found that complete arsenic elimination and fluoride concentration of 0.45 mg L-1 can be achieved under a current density of 7 mA cm-2 and linear flow velocity of 1.2 cm s-1, meeting the World Health Organization guidelines. The remaining hydrated silica reached a concentration of 10 mg L-1.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2023)
Article
Environmental Sciences
Gaogui Jing, Xiangsong Meng, Renji Zheng, Jing Chen, Wei Sun, Zhiyong Gao
Summary: This study demonstrates the feasibility of electrocoagulation (EC) as an alternative method for removing chemical oxygen demand (COD) from sodium oleate-containing wastewater. Major variables were evaluated to optimize EC, and related mechanisms were proposed to explain the observations in EC experiments.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Engineering, Chemical
Boyang Yu, Jingqiu Sun, Kai Zhao, Jiayu Tian, Chengzhi Hu
Summary: An electrochemical MBR (electro-MBR) was developed to simultaneously alleviate membrane fouling and enhance phosphorus removal using a low-maintenance method. The integration of a Fe anode and a membrane cathode allowed for coagulation by Fe ions and electrostatic repulsion, significantly mitigating membrane fouling and enhancing phosphorus removal. The electro-MBR exhibited increased microbial species diversity and extended membrane module service life, resulting in decreased maintenance costs of 66.7%.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Environmental Sciences
Chenhao Gong, Jian Zhang, Xiaojing Ren, Can He, Junxing Han, Zhongguo Zhang
Summary: Electrocoagulation (EC) using iron, zinc, and aluminum electrodes was compared for the treatment of selenium in flour production wastewater. It was found that EC treatment with iron anode achieved the highest removal efficiency for selenium. The removal of selenium was mainly due to electrodeposition and adsorption, and the operational conditions significantly influenced the removal performance. The study also revealed the competitive adsorption during the selenium removal process.
Article
Engineering, Environmental
Hasan E. Ganem, M. Iggy Litaor, Oren Reichmann, Iris Zohar
Summary: This study aimed to optimize the chemical-physical process of loading phosphorus from cowshed wastewater onto iron desalinization treatment residue (Fe-DTR) and explain the interactions involved. The results showed that phosphorus adsorption was enhanced at lower pH and higher temperature. The optimal conditions for phosphorus loading onto Fe-DTR were pH 3, particle size distribution of 45-90 μm, solid/liquid ratio of 5 g L-1, and loading time of 3 hours.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Environmental
Yushi Tian, Nianhua Chen, Xu Yang, Chunyan Li, Weihua He, Nanqi Ren, Guohong Liu, Wulin Yang
Summary: Migrating electric field-assisted electrocoagulation (MEAEC) is a three-electrode electrochemical system that utilizes waste flour-derived sponge biochar (SBC) as an adsorption electrode for efficient phosphorus removal from wastewater. The SBC electrode, with its low energy consumption and excellent effluent quality, demonstrated great potential in phosphate removal. The MEAEC system with SBC electrode achieved a high level of phosphate removal with much lower energy consumption compared to previous studies.
Article
Environmental Sciences
Abdulkarim Almukdad, Alaa H. Hawari, MhdAmmar Hafiz
Summary: In this study, a new electrode configuration was used for electrocoagulation to remove Fe and Mn from primary treated municipal wastewater, achieving high removal percentages. The new electrode configuration reduced the consumption of aluminum electrodes and showed comparable results to simulations done using the COMSOL software.
Article
Engineering, Environmental
Yueh-Feng Li, Yu-Jung Liu, Chia-Hui Yen, Ching-Yao Hu
Summary: The aim of this study is to investigate whether the application of ultrasound and chloride could improve the efficiency of boron removal via electrocoagulation in the presence of high sulfate concentration. The results showed that the application of ultrasound effectively eliminated the passive film, significantly improving the current efficiency from 52.4% to 102%. The integration of ultrasound and chloride addition dramatically enhanced boron removal capacity from 11 mg/L to 29 mg/L by electrocoagulation.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Chemical
Ehsan Jafari, M. Reza Malayeri, Heike Brueckner, Peter Krebs
Summary: This study investigated the effects of various operating parameters on the removal efficiency of turbidity from synthetic wastewater using electrocoagulation-flotation (ECF) with aluminium electrodes. The optimal conditions for achieving 90% turbidity removal were found to be a current density of 0.0028 A/cm2, an initial pH of 7.3, an operating time of 5 min, and a stirring speed of 500 rpm.
MINERALS ENGINEERING
(2023)
Article
Environmental Sciences
A. Y. Goren, M. Kobya
Summary: This study investigated the combined effects of anions on arsenic removal in groundwater using aerated electrocoagulation technology. Optimal operating parameters were determined through experimental design and mathematical modeling, revealing the relationship between independent parameters and treatment efficiency.
Article
Environmental Sciences
Yu Yu, Yiwei Zhong, Wanli Sun, Jiajun Xie, Mingyong Wang, Zhancheng Guo
Summary: A centrifugal electrode reactor was designed and applied in the treatment of heavy metal wastewater, which significantly improved the removal efficiency of heavy metals. The analysis showed that the improved performance was due to the dissolution characteristic of centrifugal electrodes and the enhanced diffusion of chloride ions.
Article
Engineering, Chemical
Afef Barhoumi, Sana Ncib, Wided Bouguerra, Elimame Elaloui
Summary: This research focuses on the use of rectangular aluminum electrodes to remove nickel from synthetic and industrial wastewater. The study evaluates the effects of electrocoagulation parameters on heavy metal removal and investigates the behavior of nickel during the process. The results show that optimal conditions for maximum nickel removal include a bipolar connection, pH of 5.0, current density of 1.388 mA cm(-2), electrolysis time of 30 minutes, and NaCl concentration of 1.5 g L-1. The process achieves over 95.51% nickel removal with minimal energy consumption of 0.195 kWh m(-3). The economic feasibility of the process is also evaluated, showing its effectiveness in treating industrial wastewater with total nickel removal and low treatment cost. These findings suggest potential industrial applications for this method.
DESALINATION AND WATER TREATMENT
(2022)
Article
Chemistry, Multidisciplinary
Yasemin Caliskan, Hulya Ozturk, Nihal Bektas, H. Cengiz Yatmaz
Summary: The study investigated the reusability of greywater through an electrocoagulation process enhanced by UVA using aluminum and iron electrodes. Optimal conditions were found for pH, current density, and salt concentration, leading to significant removal of contaminants such as Escherichia coli, COD, turbidity, TSS, TN, TP, and BOD(5).
SEPARATION SCIENCE AND TECHNOLOGY
(2021)
Article
Environmental Sciences
Philip Isaac Omwene, Mehmet Salim Oncel, Meltem Celen, Mehmet Kobya
Article
Ecology
Philip Isaac Omwene, Mehmet Kobya, Orhan Taner Can
ECOLOGICAL ENGINEERING
(2018)
Article
Electrochemistry
Z. Ukundimana, P. Omwene, E. Gengec, O. T. Can, M. Kobya
ELECTROCHIMICA ACTA
(2018)
Article
Engineering, Environmental
Philip Isaac Omwene, Meltem Celen, Mehmet Salim Oncel, Mehmet Kobya
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2019)
Article
Biotechnology & Applied Microbiology
Philip Isaac Omwene, Zehra Betul Ocal, Meltem Yagcioglu, Ahmet Karagunduz, Bulent Keskinler
Summary: This study addresses the purification issue of bio-based succinic acid from fermentation by-products using three different anionic resins. The results showed that the choice of resin significantly influenced the separation efficiency, and the concentration of regenerant and temperature also had an impact on the efficiency.
BIOPROCESS AND BIOSYSTEMS ENGINEERING
(2022)
Article
Engineering, Environmental
Xingxing Hu, Lingjie Liu, Yanmeng Bi, Lu Li, Chunsheng Qiu, Jingjie Yu, Shaopo Wang
Summary: In this study, the impact of exogenous folate on the start-up process of single-stage partial nitritation-anammox (SPNA) was evaluated using two lab-scale reactors. The results showed that folate addition can enhance nitrogen removal rate, extracellular polymeric substances production, hydrazine oxidase and dehydrogenase activity, as well as the relative abundance of Candidatus Brocadia.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Shaocang He, Tingting Shen, Jing Sun, Haoqi Pan, Chenxu Sun, Tianpeng Li, Runyao Li, Enshan Zhang
Summary: A novel process of acid leaching neutralization was developed for the preparation of inorganic polymeric composite ferric aluminum silicate coagulant (CFAS) using solid waste coal gasification coarse slag (CGCS). The optimized preparation process was determined through single-factor experiment and the performance of CFAS was evaluated for domestic sewage treatment. The results showed that CFAS exhibited excellent coagulation ability and achieved significant removal efficiency for turbidity, ammonia nitrogen, and chemical oxygen demand.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Kinga Szatmari, Sandor Nemeth, Alex Kummer
Summary: In this article, a resilience-based reinforcement learning approach is proposed to address the potential thermal runaway issue in batch reactors. By calculating the resilience metric for reactors and utilizing Deep Q-learning to decide when to intervene in the system, resilient-based mitigation systems can be effectively developed.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Bingyou Jiang, Qi Yao, Mingqing Su, Jingjing Li, Kunlun Lu, Dawei Ding, Han Hong
Summary: This study investigates the inhibitory characteristics and mechanisms of ABC powder on coal powder explosion. The addition of ABC powder significantly decreases the maximum explosion pressure and can completely suppress coal dust explosions. The study also reveals the thermal decomposition characteristics and reaction kinetics of the mixed system.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Kubilay Bayramoglu, Mustafa Nuran
Summary: This study examines the feasibility of using pyrolytic oil from waste tires as fuel in diesel engines, and evaluates its energy, exergy, and sustainability. The results indicate that pyrolytic oil has potential as a renewable fuel source with relatively high thermal efficiency.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Xinru Duan, Yejia Lv, Jiaxing Hong, Jianzhong Wu, Jia Zhang, Yang Yue, Guangren Qian
Summary: This study successfully prepared a tube reactor with optimized catalyst formula, which showed good performance in removing dioxins and other pollutants in the experiments.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Jiaoyang Du, Xueming Dang, Xiaorong Gan, Xin Cui, Huimin Zhao
Summary: In this study, a photocatalyst-enzyme hybrid system was constructed, which solved the issue of enzyme inactivation caused by high concentration of H2O2 through photocatalytic in-situ H2O2 production, and improved the stability and catalytic efficiency of the enzyme. The effectiveness of the system in treating phenolic EDCs was confirmed through experiments.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Fu-Rong Xiu, Longsheng Zhan, Yingying Qi, Xinyue Lei, Jiali Wang, Haipeng Zhou, Wenting Shao
Summary: This study developed a synergetic and high-efficiency treatment of waste tantalum capacitors (WTCs) and polyvinyl chloride (PVC) using subcritical water process. The treatment significantly reduced the temperature and reaction time for metal tantalum recovery from WTCs, and improved the dechlorination efficiency of PVC. The optimized conditions resulted in 100% resin conversion efficiency of WTCs and 97.39% dechlorination efficiency of PVC. The interaction between decomposition products of WTCs and PVC produced a high level of benzoic acid.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Bingda Li, Jiaming Song, Yuting Li, Chaoying Meng, Shuxian Wang, Linghao Zong, Honggang Ye, Yishuai Jing, Feng Teng, Peng Hu, Haibo Fan, Guangde Chen, Xin Zhao
Summary: CdPS3 nanosheets, especially those exfoliated by sodium cholate, have shown highly efficient photocatalytic degradation performance. The strong dark adsorption and dye-sensitized photocatalytic properties of CdPS3 nanosheets contribute to high degradation efficiencies of various pollutants.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Dongxu Ouyang, Yimei Pang, Bo Liu, Zhirong Wang
Summary: This study investigates the thermal runaway features of lithium-ion cells under tunnel conditions, considering different states of charge and tunnel ceilings. The results show that the tunnel visibility is affected by the smoke generated during thermal runaway, and the shape of the tunnel ceiling influences the temperature rise differently.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)