Article
Environmental Sciences
Alireza Gholizade, Gholamreza Asadollahfardi, Reza Rezaei
Summary: The study evaluated the UV-LED/chlorine process for removing RB19 dye, showing over 99% removal efficiency under optimized conditions. Compared to using chlorine alone, the combined UV-LED/chlorine process demonstrated significantly higher removal rates, indicating its effectiveness for dye degradation.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Environmental
Xuefeng Sun, Dongbin Wei, Jun Liu, Yuguo Du
Summary: This study investigates the changes in toxicity and transformation characteristics of benzophenone-type UV filters during combined UV-chlorine disinfection process. A highly toxic product was identified, which is 40 times more toxic than the original substance, and the formation mechanisms of this toxic product were revealed.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Zijun Chen, Huiyi Xu, Chunyan Cao, Xiaoting Chen, Min Zhang, Minkun Jian, Yuechan Li, An Xie
Summary: Three Sm3+ doped materials were synthesized and characterized, with Lu2WMoO9 showing the highest PL intensity. The emission processes and optimal doping concentration of the phosphor were illustrated through diagrams and concentration studies. By combining Sm3+ doped Lu2WMoO9 with UV 365 nm chips, near white W-LEDs were obtained for single phosphor-based UV W-LED applications.
Article
Engineering, Environmental
Qingqing Kong, Mengge Fan, Ran Yin, Xinran Zhang, Yu Lei, Chii Shang, Xin Yang
Summary: This study found that four micropollutants can be degraded during the co-exposure of ClO2 and UVC radiation in drinking water treatment scenarios. The degradation pathways include ClO2 oxidation, UVC photolysis, and radical and chlorine oxidation. The yields of undesired byproducts are low, but the yield of chlorite is high and requires attention.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Environmental Sciences
Mingxue Li, Zexiu An, Yanru Huo, Jinchan Jiang, Yuxin Zhou, Haijie Cao, Maoxia He
Summary: This study investigated the reaction mechanisms between brominated contaminants and different oxidants in chlorine-based AOPs and simulated their degradation kinetics under different conditions. The results showed that hydrogen peroxide, chlorine, and chloramine were effective oxidants for removing brominated contaminants.
Article
Environmental Sciences
Guo-Qiang Li, Zheng-Yang Huo, Qian-Yuan Wu, Zhuo Chen, Yin-Hu Wu, Yun Lu, Hong-Ying Hu
Summary: Recently, UV-LEDs and chlorine combined system has been used as an emerging advanced oxidation process, with investigations on the quantum yields of chlorine photolysis using polychromatic UV sources. Different trends in radical species productions were observed in 265 nm and 280 nm LED UV/chlorine systems as pH varied from 5.0 to 10.0.
Article
Engineering, Environmental
Xin Lei, Yu Lei, Shuangshuang Cheng, Xin Yang
Summary: This study investigated the reaction kinetics between chlorine radicals and N-nitrosamines, and found a positive correlation between the number of methylene groups and the reaction rate of chlorine radicals. The UV/chlorine advanced oxidation process slightly increased the degradation of N-nitrosamines compared to UV irradiation alone, and chloride ions did not inhibit their removal.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Environmental Sciences
Ying Cao, Jun Yao, Tatjana Solevic Knudsen, Wancheng Pang, Junjie Zhu, Bang Liu, Hao Li, Miaomiao Li, Jianchao Su
Summary: UV/chlorine showed higher BPA degradation efficiency and pH-dependency than UV/H2O2 due to chlorination and the synergy of center dot OH and RCS. The primary radicals, center dot OH and Cl center dot, played a pivotal role in BPA degradation in UV/chlorine process at all pH investigated. Chlorination, hydroxylation, and breakage of the isopropylidene chain were the decomposition pathways in the UV/chlorine system, while only hydroxylation and breakage of the isopropylidene chain occurred in the UV/H2O2 system. Toxicity analysis revealed that the UV/chlorine system produced a mixture with higher toxicity compared to the UV/H2O2 system. Careful consideration of the possible environmental risk is required when using UV/chlorine to remove BPA in real waters.
Article
Chemistry, Multidisciplinary
Shangfeng Liu, Ye Yuan, Lijie Huang, Jin Zhang, Tao Wang, Tai Li, Junjie Kang, Wei Luo, Zhaoying Chen, Xiaoxiao Sun, Xinqiang Wang
Summary: A 4-inch crack-free high-power UVC-LED wafer is reported in this study, achieved through a strain-tailored strategy. The introduction of a 3D-2D transition layer during the homo-epitaxy process enables the growth of a high-quality Al0.6Ga0.4N layer, resulting in outstanding performances of the 4-inch UVC-LED wafers. This breakthrough brings cost-effectiveness to UVC-LED production and accelerates its application in daily life.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Engineering, Chemical
Jie Wang, Haibao Liu, Yan Wang, Defang Ma, Guangping Yao, Qinyan Yue, Baoyu Gao, Xing Xu
Summary: The UV-LED/O-3 process with different wavelengths of UV-LED can effectively degrade hexazinone, with the best performance achieved at a wavelength of 280 nm, utilizing both radical and non-radical forms for degradation. Toxicity of wastewater can be evaluated using T.E.S.T. and Vibrio fischeri, suggesting that an alkaline environment and sufficient oxidation time can reduce toxicity.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Environmental Sciences
Yun-Lu Zhang, Yi-Li Lin, Tian-Yang Zhang, Yong-Shan Lu, Xiao-Yang Zhou, Zhi Liu, Zheng-Xiong Zheng, Meng-Yuan Xu, Bin Xu
Summary: In this study, the degradation of 2,4,6-Trichloroanisole (2,4,6-TCA) by UV/chlorination with different UV sources was compared. It was found that UV-LED (275 nm)/chlorination achieved the highest removal rate of 2,4,6-TCA, reaching 80.0%, and the degradation was mainly caused by direct UV photolysis and indirect hydroxyl radical oxidation. Factors such as initial chlorine dosage, 2,4,6-TCA concentration, and pH value significantly affected the degradation process. The presence of natural organic matter and bicarbonate inhibited 2,4,6-TCA degradation, while chloride ion had negligible effects. UV-LED (275 nm)/chlorination also showed promising results in removing 2,4,6-TCA in real water, indicating its potential in controlling 2,4,6-TCA pollution and odor problems.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Chemical
Jie Wang, Lijing Pang, Yue Gao, Kangying Guo, Qinyan Yue, Xing Xu, Baoyu Gao
Summary: The study investigates the effect of wavelength on the removal of hexazinone using ultraviolet light-emitting diode (UV-LED) in combination with H2O2. It is found that the highest degradation efficiency of hexazinone is achieved at a wavelength of 265 nm in the UV-LED/H2O2 process, with the lowest energy consumption. Dual-wavelength UV-LED irradiation (265 and 280 nm) accelerates the photolysis of H2O2 and increases the efficiency of pollutant degradation. The UV-LED/H2O2 process demonstrates high degradation efficiency and energy savings in various pH environments, except under strongly alkaline conditions.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Environmental Sciences
Ying Shen Teo, Iman Jafari, Fei Liang, Youmi Jung, Jan Peter Van der Hoek, Say Leong Ong, Jiangyong Hu
Summary: The UV/Cl2 process is commonly used in acidic mediums for water treatment due to its higher quantum yield of HO· from HOCl and lower radical quenching rates. Recent research evaluated its efficacy in removing trimethoprim (TMP) at both neutral and alkaline conditions.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Youngho Cha, Tae-Kyoung Kim, Jaewon Lee, Taeyeon Kim, Ae-Jung Hong, Kyung-Duk Zoh
Summary: The degradation mechanism of iopromide under different UV-LED wavelengths and chlorine reaction was investigated. The degradation rate and contribution of different radical species varied with wavelength.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Environmental Sciences
Mengge Fan, Xin Yang, Qingqing Kong, Yu Lei, Xinran Zhang, Ehsan Aghdam, Ran Yin, Chii Shang
Summary: The study demonstrated the effectiveness of the sequential ClO2-UV/chlorine process in removing micropollutants and controlling the formation of disinfection byproducts(DBPs). ClO2 pretreatment significantly reduced the formation of DBPs during the UV/chlorine process.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Rong-Gui Zhu, Chang-Gui Pan, Feng-Jiao Peng, Chao-Yang Zhou, Jun-Jie Hu, Kefu Yu
Summary: This comprehensive survey investigated the occurrence, bioaccumulation, and trophic magnification of parabens and their metabolite 4-HB in a marine food web. Results showed that parabens were the predominant pollutants in marine organisms, with significant bioaccumulation from sediments. The estimated trophic magnification factor indicated biomagnification for MeP and trophic dilution for 4-HB. Overall, the risks for humans consuming marine organisms were found to be low.
Article
Engineering, Environmental
Andres F. Torres-Franco, Deborah Leroy-Freitas, Cristina Martinez-Fraile, Elisa Rodriguez, Pedro A. Garcia-Encina, Raul Munoz
Summary: Anaerobic and microalgae-based technologies have emerged as sustainable alternatives for municipal wastewater treatment. However, the presence of viruses in the treated wastewater is a major concern for reuse applications. This study assessed the ability of these technologies to reduce viruses during secondary wastewater treatment. The results showed that all technologies were effective in reducing the concentration of viruses, with microalgae-based treatment exhibiting the highest potential for reducing the disinfection requirements of treated wastewater.
Article
Engineering, Environmental
Young Gwang Kim, Sae Yun Kwon, Spencer J. Washburn, Scott C. Brooks, Ji Won Yoon, Lucien Besnard
Summary: The study uses Hg isotope ratios to identify the sources and exposure pathways of mercury in bivalves, finding that dissolved Hg phases in the water column are the primary source and exposure pathway to bivalves. This provides new insights into using bivalves as bioindicators for sediment quality monitoring.
Article
Engineering, Environmental
Hui Geng, Ying Xu, Rui Liu, Dianhai Yang, Xiaohu Dai
Summary: This study investigates the effect of cation exchange resin (CER) on the sequential recovery of hydrogen and methane from anaerobic digestion (AD) and the corresponding mechanisms. The results show that CER can simultaneously enhance the production of hydrogen and methane by promoting the solubilisation, hydrolysis, and acidification of organic matter. Additionally, CER facilitates effective contact between bacteria and organic particulates and reduces the energy barrier for mass transfer during methane production. The study also reveals changes in the microbial community structure and metagenomics during the AD process.
Article
Engineering, Environmental
Xiaojing Lin, Zhan Jin, Shunfeng Jiang, Zhiquan Wang, Suqing Wu, Ke Bei, Min Zhao, Xiangyong Zheng
Summary: Dehumidification combined with addition of absorbent resin supplement (ARS) was used to achieve rapid evaporation of non-pretreated urine, resulting in high water evaporation efficiency and nutrient recovery.
Article
Engineering, Environmental
Yangli Che, Chaoran Lin, Shen Li, Jiao Liu, Longhai Zhu, Shilei Yu, Nan Wang, Haoshuai Li, Mutai Bao, Yang Zhou, Tonghao Si, Rui Bao
Summary: Hydrodynamic processes play a crucial role in the transmission of sediments, microbial assembly, and organic carbon redistribution in the ocean. Through experiments and analysis, we found that hydrodynamics shape the assembly of microbial communities and control the redistribution of different sourced organic carbon, thereby influencing microbial-mediated biogeochemical transformation.
Article
Engineering, Environmental
Chao Chen, Yu Yang, Nigel J. D. Graham, Zhenyu Li, Xingtao Yang, Zhining Wang, Nadia Farhat, Johannes S. Vrouwenvelder, Li -an Hou
Summary: The fouling of seawater reverse osmosis membranes is a persistent challenge in desalination. This study monitored the operational performance of a desalination plant for 7 years and the fouling development in different areas of membrane modules. The findings showed that operational performance declined over time and fouling mainly occurred at the feed side of the modules, with the highest microbial diversity. Keystone species like Chloroflexi and Planctomycetes played an important role in maintaining community structure and biofilm maturation. Polysaccharides, soluble microbial products, marine humic acid-like substances, and inorganic substances contributed to fouling. Overall, biofouling had a significant impact on membrane fouling after 7 years of operation.
Article
Engineering, Environmental
Dan Li, Jieyi Sun, Yibo Fu, Wentao Hong, Heli Wang, Qian Yang, Junhong Wu, Sen Yang, Jianhui Xu, Yunfei Zhang, Yirong Deng, Yin Zhong, Ping'an Peng
Summary: Sulfidation-oxidation treatment of magnetite (Fe3O4) enhances the production of dark center dot OH, which can efficiently degrade dissolved organic matter (DOM) and accelerate carbon cycling.
Article
Engineering, Environmental
Cheng Yu, Kaijun Wang, Kaiyuan Zhang, Ruiyang Liu, Pingping Zheng
Summary: This study implemented a microaerobic-aerobic configuration in a full-scale municipal wastewater treatment facility and investigated the effects on sludge characteristics, pollutant removal, microbial community, and granulation mechanisms. The results showed successful transition from flocculent-activated sludge to well-defined AGS after two months of operation. The primary pathways for pollutant removal were simultaneous nitrification, denitrification, and phosphorus removal. Moreover, the incorporation of internal separators induced shifts in the flow pattern, which promoted granulation.
Article
Engineering, Environmental
Zhe Zhang, Shaoyang Hu, Guangrong Sun, Wei Wang
Summary: Halogenated aromatic disinfection byproducts (DBPs), such as halogenated phenols, have garnered widespread attention due to their high toxicity and prevalence. This study reports on the analysis, occurrence, and cytotoxicity of a group of emerging halogenated aromatic DBPs, known as halogenated polyhydroxyphenols (HPPs), in drinking water.
Article
Engineering, Environmental
Shengyue Chen, Jinliang Huang, Peng Wang, Xi Tang, Zhenyu Zhang
Summary: Accurate prediction of river water quality is crucial for sustainable water management. This study introduces wavelet analysis and transfer learning techniques to assist LSTM modeling, proposing a newly coupled modeling approach that improves short-term prediction of river water quality.
Article
Engineering, Environmental
Bang Du, Xinmin Zhan, Piet N. L. Lens, Yifeng Zhang, Guangxue Wu
Summary: Efficient anaerobic digestion relies on the cooperation of different microorganisms with different metabolic pathways. This study investigated the effects of different operational modes and the addition of powdered activated carbon (PAC) on ethanol metabolic pathways. The results showed that the SBR mode and the presence of CO2 facilitated ethanol metabolism towards propionate production, while the CFR mode with extended solids retention time enriched Geobacter. Adjusting operational modes and PAC addition can modulate anaerobic ethanol metabolism and enrich Geobacter.
Article
Engineering, Environmental
Wanfa Wang, Si-Liang Li, Jun Zhong, Yuanbi Yi, Fujun Yue, Zenglei Han, Qixin Wu, Ding He, Cong-Qiang Liu
Summary: This study compares the carbon biogeochemical processes in karst and non-karst regions within large thermal stratified river-reservoir systems. The results demonstrate that karst reservoirs have a reduced potential for carbon emissions and highlight the importance of considering geologic settings to improve accuracy in regional and global CO2 emission estimates.
Article
Engineering, Environmental
Chunxia Jiang, Zelong Zhao, Dong Zhu, Xiong Pan, Yuyi Yang
Summary: This study analyzed the occurrence and distribution of antibiotic resistance genes (ARGs) in different environmental media of the Yangtze River using metagenomics. Core resistome dominated by multidrug resistance genes was found in all samples, while rare resistome dominated by various resistance genes was more prevalent in plasmids. Specific bacteria were identified as hosts for both core and rare resistomes, with high clinical concern ARGs found in the rare resistome. Particle-associated environment provided the most ideal conditions for resistome hosts. This study provided insights into the genetic locations of ARGs and the community assembly mechanisms of ARG hosts in freshwater environments.
Article
Engineering, Environmental
Yu Zhang, Yongtao He, Linchun Jia, Lei Xu, Zheng Wang, Yueling He, Ling Xiong, Xumeng Lin, Hong Chen, Gang Xue
Summary: By synergizing organic carbon source, thiosulfate, and zero-valent iron, efficient mixotrophic denitrification of oligotrophic secondary effluent can be achieved. Thiosulfate plays a vital role in promoting TN removal efficiency, while corrosion of Fe0 releases OH- to neutralize H+ from thiosulfate-driven denitrification, creating a suitable environment for denitrification. The coordination of thiosulfate and Fe0 maintains the dominance of Thiobacillus for denitrification.