Article
Environmental Sciences
Shigang Ren, Shaoyong Huang, Baixiong Liu
Summary: In this study, the NH3-N adsorption performance of modified vermiculite (Na-V) was greatly improved compared to natural vermiculite (NV), providing a new method for removing high concentrations of NH3-N. The improved capacity of Na-V was attributed to its higher mesoporous volume and ion-exchange capacity, resulting from sodium-ion exchange and interlayer effect caused by the high concentration of NaCl.
Article
Environmental Sciences
Yuyu Lu, Juanting Wang, Yan Feng, Honglan Li, Zhongwei Wang, Hao Chen, Ning Suo, Yanzhen Yu, Shoubin Zhang
Summary: In this study, the researchers investigated the nitrogen removal performance and rapid start-up of the anaerobic ammonia oxidation (anammox) process using an electrolytic sequencing batch reactor (ESBR) with different current densities. The results showed that applying the optimal current density significantly improved the ammonium nitrogen removal efficiency, nitrite nitrogen removal efficiency, and total nitrogen removal efficiency. The stoichiometric ratio indicated that anammox could be successfully initiated in a shorter time period with the application of current density. These findings suggest that using current density can stimulate the activity of anammox bacteria and accelerate the start-up process.
Article
Environmental Sciences
Mengfei Chen, Xuewei Li, Qiwu Zhang, Chao Wang, Huimin Hu, Qian Wang, Chaocheng Zeng
Summary: By electrochemically dissolving siderite to produce fresh Fe3+ in situ, an efficient method for removing PO43- from wastewater can be developed, with the potential to keep the effluent PO43- concentration below 1 mg L-1 under certain conditions.
Article
Chemistry, Multidisciplinary
Xiyang Cai, Zulipiya Shadike, Xinyin Cai, Xingdian Li, Liuxuan Luo, Lu An, Jiewei Yin, Guanghua Wei, Fan Yang, Shuiyun Shen, Junliang Zhang
Summary: This study proposes a feasible membrane electrode assembly (MEA) configuration as a promising solution to overcome the limitations of the lithium-mediated process (LiNR) in ammonia synthesis via the electrochemical nitrogen reduction reaction (NRR). The MEA configuration offers the advantages of efficient gas transfer, reduced solvent consumption, and compact structure for LiNR.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Engineering, Chemical
Jing Ma, Wei Wei, Guotong Qin, Lei Jiang, Ngie Hing Wong, Jaka Sunarso, Shaomin Liu
Summary: This study presents an efficient reactor design that integrates an electrocatalytic packed-bed reactor with a membrane for nitrate removal. The reactor system shows excellent nitrate removal and nitrogen selectivity, highlighting the potential for large-scale nitrate remediation.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Agricultural Engineering
Qianwen Sui, Fei Di, Junya Zhang, Hui Gong, Li'an Jiang, Yuansong Wei, Jie Liu, Jia Lin
Summary: This study confirmed the feasibility of anaerobic ammonia oxidation as a tertiary nitrogen removal process, and identified the main nitrogen removal pathway using anammox in an upflow fixed-bed reactor. It also investigated the cooperation mechanism among AOA, AOB, and AnAOB in the inner-layer of biofilm in the reactor.
BIORESOURCE TECHNOLOGY
(2021)
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
Environmental Sciences
Shu-Hui Liu, Kun-Yan Lee
Summary: The packed anode bioelectrochemical system (Pa-BES) developed in this study effectively removes organic substances from waste gas and shows great potential for practical application. The optimal performance of the system was achieved when the empty-bed residence time was 45 s and the liquid flowrate was 35 mL/s, with a removal efficiency of 93.86%, mineralization efficiency of 93.37%, voltage output of 296.3 mV, and power density of 321.12 mW/m(3). Microbial community dynamics analysis revealed the spatial distribution of various organic degraders, electrochemically active bacteria, nitrifying, and denitrifying bacteria in the system.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Environmental
Shima Mardani, Majid Baghdadi, Ali Torabian, Behnoush Aminzadeh Goharrizi
Summary: The aim of this study was to investigate an electrochemical continuous-flow reactor for the removal of ammonia nitrogen, its by-product, and Chemical Oxygen Demand from synthetic and real municipal wastewater effluent. The optimized operating conditions resulted in high removal efficiencies of ammonia nitrogen and COD. This study highlights the importance of an electrochemical continuous flow reactor for the removal of nitrogen and COD.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Chemistry, Physical
J. A. Andersen, J. M. Christensen, M. ostberg, A. Bogaerts, A. D. Jensen
Summary: This study investigated the plasma-catalytic ammonia decomposition for producing hydrogen using a packed-bed dielectric barrier discharge reactor. The introduction of dielectric materials with certain dielectric constants improved the ammonia decomposition, with MgAl2O4 showing the highest conversion rate. Further studies are needed to optimize the efficiency of this technology.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Physics, Applied
K. van 't Veer, S. van Alphen, A. Remy, Y. Gorbanev, N. De Geyter, R. Snyders, F. Reniers, A. Bogaerts
Summary: DBDs typically operate in a filamentary regime and require fundamental insight for optimization. The Monte Carlo approach can determine the proportion of individual gas molecules exposed to microdischarges. The concept of the fraction of microdischarges indicates the efficiency of plasma power transfer to gas molecules.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Environmental Sciences
Lanshan Liu, Siying Hao, Jiamei Liu, He Zhou, Xiaohong Hu
Summary: This research investigates the treatment of phenol wastewater using an electrochemical bromination method. A Ti/Sb-SnO2/PbO2 electrode was used as the anode and the experiments were conducted under different conditions. The results showed that under the best operational conditions, phenol and COD removal efficiencies were 100% and 82.7% respectively. Additionally, the electrochemical bromination method demonstrated high apparent current efficiency and low energy consumption.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Review
Environmental Sciences
Maryam Zulkifli, Hassimi Abu Hasan, Siti Rozaimah Sheikh Abdullah, Mohd Hafizuddin Muhamad
Summary: Extensive growth of industries has led to uncontrolled ammonia releases, causing significant harm to aquatic ecology and human health. This paper discusses the mechanism of ammonia elimination and the effectiveness of biofilm reactors in ammonia treatment, providing future perspectives for related research.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Environmental
Yuhao Wu, Jiancheng Shu, Wenxing Cao, Zihan Li, Bing Li, Zhonghui Xu, Hongliang Chen, Mengjun Chen, Zongyu Deng
Summary: In this study, adsorption using modified phosphate ore flotation tailings was used to remove Mn2+ and NH4+-N from electrolytic metal manganese wastewater (EMMW). The results showed that the adsorption process followed the pseudo-first-order adsorption kinetic model and Weber's intraparticle diffusion model, and the reaction was endothermic.
ENVIRONMENTAL SCIENCE-WATER RESEARCH & TECHNOLOGY
(2022)
Article
Engineering, Environmental
Jianhua Wang, Lifen Liu, Tingting Yu, Yihua Li, Changfei Gao
Summary: In this study, a novel triple-layered heterojunction catalytic cathode membrane (PVDF/rGO/TFe/MnO2) was developed and applied in a seawater electro membrane reactor assisted electrolytic cell system, which showed improved properties for cyanide wastewater treatment.