Article
Engineering, Environmental
Yiting Zhang, Shaohua Yin, Haoyu Li, Jian Liu, Shiwei Li, Libo Zhang
Summary: This study introduces a novel ultrasonic strengthened break point chlorination method (USBM) for treating ammonia nitrogen wastewater and investigates its process conditions and reaction mechanism. The experimental results show that under optimal conditions, the USBM can achieve a removal efficiency of over 80.31% for ammonia nitrogen, which is 29.86% higher than the traditional break point chlorination method. The study also finds that both the USBM and traditional method conform to the pseudo-second-order kinetic model. Gas analysis reveals that the produced gas is non-toxic and harmless nitrogen.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Environmental Sciences
Weng Kiat Tan, Siew Cheong Cheah, Shridharan Parthasarathy, R. P. Rajesh, Cheng Heng Pang, Sivakumar Manickam
Summary: The study showed that ultrasonic cavitation combined with advanced oxidation processes is more effective in reducing levels of ammonia nitrogen and nitrite in fish pond water compared to using ultrasound alone. The optimal treatment time and power were established, and the combination of ultrasonic cavitation with hydrogen peroxide was identified as a promising technique for reducing total ammonia nitrogen levels.
Article
Engineering, Chemical
Chang Liu, Liang Zhu, Rongping Ji, Shanfu Tang
Summary: A hybrid ultrasonic stripping-membrane distillation (US-MD) system was established for efficient purification of mariculture wastewater. The US pretreatment significantly improved NH4+-N removal without pH adjustment and promoted protein denaturation and salt crystallization. With a period of standing treatment between US and MD, denatured protein floccules and salt crystals could be effectively removed, reducing fouling behavior. This highlights the importance of standing treatment in the US-MD system.
Review
Environmental Sciences
Nian Liu, Zhen Sun, Huan Zhang, Lasse Hyldgaard Klausen, Ryu Moonhee, Shifei Kang
Summary: Bacterial and photocatalysis techniques are widely used for the remediation of ammonia nitrogen wastewater. While traditional microbial methods are proven useful, there is a need for more efficient and controllable treatment methods to address the diverse cases of ammonia nitrogen pollution. Bacterial treatment relies on ammonia nitrogen oxidation-reduction by nitrifying and denitrifying bacteria, but these reactions are slow and uncontrolled. Photocatalysis, on the other hand, has advantages such as low temperature reaction and long life, but cannot perform multiple complex biochemical reactions. This review highlights recent achievements, key problems, and future directions for remediation of high-ammonia-nitrogen wastewater using bacterial treatment and photocatalysis techniques, including the potential of combining bacterial-photocatalysis techniques.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Chemistry, Multidisciplinary
Siyu Fu, Kaibin Chu, Minhao Guo, Zhenzhong Wu, Yang Wang, Jieru Yang, Feili Lai, Tianxi Liu
Summary: The electronic structure of RhCu nanospheres was optimized and their size was reduced using an ultrasonic-assisted hydrothermal method. This led to improved performance in electrocatalytic urea synthesis, with enhanced faradaic efficiency and urea yield rate of 34.82 +/- 2.47% and 26.81 +/- 0.62 mmol g(-1) h(-1) respectively. This work provides a novel approach for synthesizing an electrocatalyst for urea production using ultrasonic treatment.
CHEMICAL COMMUNICATIONS
(2023)
Article
Ecology
Hongbo Liu, Haoran Jian
Summary: With the rapid development of society and urbanization, greenhouse gas emissions have increased, leading to environmental problems such as global warming. The rise in urban water consumption has also resulted in increased sewage discharge, exacerbating freshwater scarcity and water pollution. Understanding the current status and spatial distribution of greenhouse gas emissions in China's sewage treatment industry is crucial for emission reduction measures and controlling ammonia nitrogen pollution.
FRONTIERS IN ECOLOGY AND EVOLUTION
(2023)
Review
Engineering, Environmental
Mariella Belen Galeano, Mira Sulonen, Zainab Ul, Mireia Baeza, Juan Antonio Baeza, Albert Guisasola
Summary: Due to the anticipated rise in demand for ammonia, there has been increased research on viable methods for its recovery, with a focus on reducing the high energy demand associated with traditional ammonia production. Bioelectrochemical systems (BESs) offer a promising alternative for ammonia recovery, with lower energy demand compared to other methods at the lab-scale. This paper explores the fundamentals and opportunities of bioelectrochemical ammonia recovery in various BES devices and discusses the challenges in scaling up for industrial adoption.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Huanjun Bao, Meirong Wu, Xiangsong Meng, Haisheng Han, Chenyang Zhang, Wei Sun
Summary: With the rapid industrialization and urbanization processes, wastewater pollution has become a severe issue threatening human health and the environment. High-salinity organic ammonia-nitrogen wastewater, generated from various sources such as smelting, pharmaceuticals, landfill leachate, and aquaculture, poses significant risks to the environment. This article presents the sources, characteristics, and hazards of this type of wastewater, investigates the electrochemical oxidation (EO) technology for its treatment, including its basic principles and mechanisms. Additionally, the influencing factors of EO are analyzed, and conclusions and future prospects for this technology are provided.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
In Hwan Shin, Jiyeol Im, SeongJoo Kang, Sang-hun Lee, Ji Won Lee, Kyungik Gil
Summary: The study proposed a unique membrane bioreactor system with sulfonate membrane for simultaneous removal of organic and nitrogen in wastewater. This system consists of two reactors, A and B, with reactor A in anoxic condition and reactor B in aerobic condition. High nitrogen fluxes observed in the system indicated high ion diffusivity, leading to almost complete nitrogen removal efficiency achieved in the batch system. Moreover, no severe nitrate accumulation problem was observed in reactor B, showing the potential for low operation costs and high removal efficiencies of ammonia nitrogen in this unique membrane system.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Engineering, Environmental
Jiawei Fan, Haixia Wu, Ruoyu Liu, Liyuan Meng, Zhi Fang, Feng Liu, Yanhua Xu
Summary: The study demonstrated the effectiveness of using non-thermal plasma combined with zeolites for the removal of ammonia nitrogen from wastewater. The synergistic system showed a higher removal efficiency compared to using zeolites or discharge plasma alone, with key factors for optimal removal including higher applied voltage, lower initial ammonia nitrogen concentration, and weak acidic conditions. The characterization of zeolites post-reaction confirmed the stability and applicability of the plasma/zeolites system for treatment of low-concentration ammonia nitrogen wastewater.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Environmental Sciences
Shuju Fang, Gufeng Li, Hongyu Shi, Junxiu Ye, Hongbin Wang, Xuemei Ding, Lijun Luo, Guizhen Li, Min Yang
Summary: A low-cost functionalization method was used to prepare an efficient adsorbent for ammonia nitrogen from diatomite. The optimized conditions included modification with H2SO4, NaCl, and calcination, resulting in excellent adsorption performance of the functionalized diatomite (DTCA-Na). The adsorption process of ammonia nitrogen followed pseudo-first-order kinetics and Langmuir isothermal model. The removal efficiency of ammonia nitrogen remained above 80% even after multiple adsorption-desorption experiments.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Hao-Tian Wang, Xue-Ling Li, Xin-Shi Wu, Jun Wan, Chun-Xue Zhang, Bo Sun, Hua-Zhang Zhao
Summary: A novel photochemical strategy utilizing solar irradiation was designed to remove inorganic ammonia nitrogen from wastewater. The photo-Fe (or Mn)eO(2) system was built to effectively remove ammonia-nitrogen from its aqueous solution. This cost-efficient and environmentally-friendly strategy does not produce NOx, providing a new possibility for wastewater treatment.
Article
Acoustics
Pello Alfonso-Muniozguren, Cristian Ferreiro, Elodie Richard, Madeleine Bussemaker, Jose Ignacio Lombrana, Judy Lee
Summary: This study explores an ultrasonic pre-treatment assisted ozonation process for the removal of humic substances in water to enhance the quality of water treatment systems for human consumption. The results demonstrate that ultrasound can promote the formation of hydroxyl radicals and reduce fluorescence during ozonation, leading to a decrease in organic matter content and improved water quality.
ULTRASONICS SONOCHEMISTRY
(2021)
Article
Engineering, Environmental
Suwan Dai, Qian Wen, Fang Huang, Yuqing Bao, Xiaodong Xi, Zhipeng Liao, Jian Shi, Changjin Ou, Juan Qin
Summary: In this study, magnesium oxide modified tobermorite adsorbents were successfully synthesized and used for the simultaneous removal of nitrogen and phosphorus from wastewater. The adsorbents showed excellent removal performance and the ability to regulate pH. Both physical and chemical adsorption were found to contribute to the removal of nitrogen and phosphorus. Furthermore, the feasibility of using the modified TOB as a slow-release fertilizer was confirmed through pot experiments.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Inorganic & Nuclear
Hanyu Zhou, Leming Ou
Summary: In this study, manganese oxide loaded onto tailing was investigated for its adsorption performance of ammonia nitrogen. The results showed that increasing manganese oxide content and adjusting pH within a certain range can enhance the adsorption, while coexisting ions inhibit the adsorption. Several characterization methods confirmed the successful loading of manganese oxide and revealed the adsorption mechanism.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
