Article
Engineering, Environmental
Xiaoping Yu, Wenlei Qin, Xiangjuan Yuan, Lei Sun, Fei Pan, Dongsheng Xia
Summary: The present study systematically investigated the degradation of atenolol (ATL) in an integrated UV/Ozone (O-3)/peroxymonosulfate (PMS) process, focusing on synergistic mechanisms, reaction kinetics, pollutant degradation pathways, and antibacterial activities. Results showed that the integrated UV/O-3/PMS process demonstrated significant advantages in ATL degradation compared to other treatment systems, with the impacts of operating parameters comprehensively explored. The study established a kinetic model to predict the relative contributions of reactive oxidants for ATL elimination in the process and identified the main transformation products and degradation pathways of ATL. Moreover, the UV/O-3/PMS process effectively reduced the antibacterial activity of ATL and its intermediates.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Engineering, Environmental
Emil Bein, Millaray Sierra Olea, Sophie Petersen, Joerg E. Drewes, Uwe Huebner
Summary: This study investigates the reaction kinetics and pathways of gabapentin (GBP) during ozone treatment. The results show that the direct reaction between GBP and ozone is slow and pH-dependent, while the deprotonated species shows a comparable rate constant to other amine compounds. LC-MS/MS measurements reveal that ozonation of GBP leads to the formation of a carboxylic acid group and simultaneous nitrate formation. Experiments with isotopically labeled ozone suggest that the intermediate aldehyde does not include any oxygen from ozone. Overall, this study provides insights into the reaction mechanisms of aliphatic primary amines during wastewater ozonation.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Environmental Sciences
Xiaoshu Yan, Han Chen, Tao Lin, Wei Chen, Hang Xu, Hui Tao
Summary: The UV/chlorination of three prescription drugs was studied and it was found that their degradation followed pseudo-first-order kinetics. The structures and transformation pathways of the products were proposed. The degradation kinetics of the drugs in natural waters were observed to be slower compared to artificial water samples, suggesting the presence of aromatic containing transformation products.
ENVIRONMENTAL TECHNOLOGY
(2022)
Article
Engineering, Environmental
Abdallatif Satti Abdalrhman, Chengjin Wang, Zuo Tong How, Mohamed Gamal El-Din
Summary: The study found that the ideal condition for degrading CHA using the UV/Chlorine process is to continuously add chlorine at a constant rate to reduce chlorine consumption and minimize the radical scavenging effect, resulting in a higher removal rate.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Engineering, Environmental
Rui Pang, Nan Li, Zhihao Hou, Junjie Huang, Cuixia Yue, Yongxin Cai, Jinxi Song
Summary: This research investigated the oxidation of sulfonamides (SAs) by chlorine dioxide (ClO2) and found that ClO2 has the potential to serve as a chemical oxidant for removing sulfonamides in practical water treatment conditions.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Jing Pan, Hong Jiang, Taiping Qing, Junfeng Zhang, Ke Tian
Summary: The study investigated the migration and transformation of substances during the pyrolysis of PVC plastics using a thermogravimetric Fourier transform infrared mass spectrometry technology. Results showed that dehydrochlorination of PVC mainly occurred in the first stage, accompanied by the formation of conjugated double bonds and a small number of hydrocarbon compounds. Furthermore, the study suggested that by controlling the pyrolysis process, the generation of second pollutants can be minimized.
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
Engineering, Environmental
Hao-Chen Zhang, Yu-Lei Liu, Lu Wang, Zhuo-Yu Li, Xiao-Hui Lu, Tao Yang, Jun Ma
Summary: It was found that TiO2 can significantly promote the degradation of DMP in the UV/chlorine system, with hydroxyl radicals and chlorine radicals being the main reactive species. The concentrations of HO center dot and Cl-center dot in the UV/chlorine/TiO2 system were several times to dozens of times higher than that in UV/chlorine, and their contributions to DMP degradation were 70.3% and 29.7%, respectively.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Engineering, Environmental
Youn-Jun Lee, Chang-Gu Lee, Seong-Jik Park, Joon-Kwan Moon, Pedro J. J. Alvarez
Summary: Combining UV and free chlorine is an efficient method for degrading recalcitrant organic compounds in water. This study found that chlorine monoxide was the main radical species responsible for the degradation of the neonicotinoid insecticide clothianidin, and the reaction rate constants indicated a faster degradation rate compared to other radical species. The presence of humic acid was found to inhibit the degradation process.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Jaewon Lee, Soyeon Eom, Seungwoon Sohn, Taeyeon Kim, Kyung-Duk Zoh
Summary: We investigated the degradation of bisphenol A (BPA) and its alternatives, bisphenol S (BPS) and bisphenol AF (BPAF), in water using the UV-LED/chlorine reaction. The removal of these compounds followed pseudo-first-order kinetics, with BPA being the most effectively removed at pH 7 due to its electron-donating isopropyl group. The degradation mechanisms varied depending on pH, with reactive chlorine species (RCS) playing a major role at pH 6 to 8 and chlorination reaction being dominant at pH 9. Chlorinated BPs (ClxBPs) were identified as major transformation products, and the UV-LED/chlorine reaction effectively removed these compounds. Various degradation pathways, such as chlorine substitution, coupling reaction, and hydroxylation, were proposed based on the identified transformation products and theoretical reactive sites. The UV-LED/chlorine process also showed effective reduction of the ecotoxicities of BPs and their transformation products.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Daisuke Minakata, Urs von Gunten
Summary: Water quality and its impacts on human and ecosystem health pose significant global challenges. While oxidative water treatment can address many hygiene and micropollutant-related issues, predicting transformation products remains a major challenge. The combination of experimental and theoretical studies has advanced the understanding of reaction kinetics and mechanisms, but further research is needed to enhance predictive capability.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Biotechnology & Applied Microbiology
Maolin Yang, Peitao Zhao, Xin Cui, Fan Geng, Qingjie Guo
Summary: This research investigated the real-time chlorine transformation characteristics and release kinetics during the hydrothermal dechlorination (HTD) of PVC, providing insights into the factors influencing chlorine removal efficiency. The study also proposed powerful solutions for removing chlorine effectively from chlorinated organic wastes.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Article
Engineering, Chemical
Wei Luo, Lin Deng, Jun Hu, Bohui Xu, Chaoqun Tan
Summary: This study investigated the degradation of DMZ and the formation of HNMs during the UV/chlorine process. The results showed that UV/chlorine process can efficiently degrade DMZ, but the formation of HNMs should be considered.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Environmental
Sultan K. Alharbi, Ashley J. Ansari, Long D. Nghiem, William E. Price
Summary: This study investigated the structural elucidation of transformation products (TPs) formed during ozone and UV treatments of diclofenac (DCF) in wastewater. The results showed that TPs formed during ozonation were characterized by the addition of hydroxyl groups and changes in double bond equivalent, while TPs formed during UV photolysis involved removal of chlorine atoms and ring closure followed by dimerization. The study also proposed possible reaction pathways for the identified DCF TPs.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Article
Engineering, Environmental
Huiming Xiang, Naiyun Gao, Xian Lu, Yuanquan Xiang, Wenhai Chu
Summary: The study found that RNS is the most important reactive species in the degradation of SMT in UV/NH2Cl, increasing NH2Cl dosage can enhance degradation rate, NOM inhibits degradation, and the degradation reactions of SMT mainly include hydroxylation, nitrosation, and ring opening reactions.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Sang-Soo Baek, Eun-Young Jung, JongCheol Pyo, Yakov Pachepsky, Heejong Son, Kyung Hwa Cho
Summary: Harmful algal blooms have become a global issue, and model development is an alternative approach for understanding and managing them. Traditional modeling methods have limitations in simulating phytoplankton and zooplankton, while deep learning models show potential for simulating harmful algal blooms.
Article
Green & Sustainable Science & Technology
Dongwhi Lee, Taeil Yoon, Byeong Ha Lee, Heejong Son, Youngbin Baek, Yunho Lee
Summary: This study found that prechlorination can increase the permeate flux and improve water quality in GDM filtration by reducing the formation of fouling layer and affecting microbial growth, but the effects diminish with longer operation time.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Engineering, Civil
Seung-Hyun Kim, Sanggoo Kim, Hoonsik Yoom, Heejong Son
Summary: This study evaluates the impact of using regenerated carbon in GAC filtration on the reduction of organic pollutants, based on long-term operational data. The results show that GAC filtration and ozonation are effective in reducing levels of dissolved organic carbon (DOC) and 1,4-dioxane. The use of regenerated carbon enhances DOC reduction, while virgin carbon is more effective for trihalomethane (THM) reduction, due to changes in pore size after regeneration.
AQUA-WATER INFRASTRUCTURE ECOSYSTEMS AND SOCIETY
(2022)
Article
Green & Sustainable Science & Technology
Yanni Sudiyani, Kenneth Widmer, Andreas Andreas, Aprilia Nur Tasfiyati, Zatil Afrah Athaillah, Muryanto Muryanto, Azilah Abd Aziz, Eun Young Lee, Yunho Lee, Suil Kang
Summary: The study found that after the implementation of a GDM filtration system in two rural schools in Indonesia, water quality improved with a reduction in fecal indicator bacteria and a decrease in student diarrhea incidence.
Article
Engineering, Environmental
Valentin Rouge, Pham Thi Thai Ha Nguyen, Sebastien Allard, Yunho Lee
Summary: This study investigates the reaction kinetics and products of ferrate (Fe(VI)) with primary amines, specifically amino acids. A new kinetic model involving ionizable intermediates is proposed to explain the unusual pH effect on the reactivity of Fe(VI) towards primary amines and amino acids. The study finds that the product distribution for amino acids differs significantly from that of uncarboxylated primary amines, with amino acids producing multiple products while primary amines mainly produce nitriles.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Environmental
Dongwhi Lee, Youngbin Baek, Heejong Son, Soryong Chae, Yunho Lee
Summary: Pre-ozonation can increase the membrane flux and improve the permeate quality in gravity-driven membrane filtration (GDM). The timing of pre-ozonation significantly affects the flux behavior and fouling layer characteristics.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Woongbae Lee, Sangki Choi, Hyunjin Kim, Woorim Lee, Minju Lee, Heejong Son, Changha Lee, Min Cho, Yunho Lee
Summary: This study assessed and compared the efficiencies of ozonation and ozone with hydrogen peroxide for the removal of organic micropollutants (OMPs), as well as the inactivation of bacteria and viruses, and the formation of bromate and biodegradable organics in municipal wastewater effluent. The results showed that ozonation effectively eliminated 39 OMPs, with 22 OMPs achieving a removal rate of 54 ± 14% at an ozone dosage of 0.5 gO(3)/gDOC. The concentration and exposure time of ozone were positively correlated with microbial inactivation levels, and O-3/H2O2 minimized bromate formation but decreased bacteria/virus inactivation. Ozonation also produced biodegradable organics, which could be removed through post-biodegradation treatment.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Environmental
Sung Ho Chae, Seung Ji Lim, Mingizem Gashaw Seid, Wondesen Workneh Ejerssa, Aseom Son, Heejong Son, Sangki Choi, Woongbae Lee, Yunho Lee, Seok Won Hong
Summary: This study aimed to implement a comprehensive prediction model for the fate of micropollutants in wastewater treatment plants (WWTPs). Through monitoring five WWTPs in South Korea, it was found that the majority of micropollutants were effectively removed by biological treatment processes. Furthermore, the prediction model was improved by optimizing the biodegradation rate constants of each micropollutant, resulting in more accurate predictions of actual data.
Article
Engineering, Environmental
Yun Lee, Jin-Hyung Noh, Ji-Won Park, Seon-Won Yoon, Sang-Yeob Kim, Hee Jong Son, Woorim Lee, Sung Kyu Maeng
Summary: Ion exchange resins are commonly used to remove natural organic matter from drinking water, but disposing of the used brine can be problematic. This study explores the use of a hybrid biological ion exchange and activated carbon system for drinking water treatment, which proves to be the most effective method for removing natural organic matter and reducing the formation of disinfection byproducts.
Article
Environmental Sciences
Chengsong Ye, Kaiting Zhang, Peizhe Sun, Yunho Lee, Kyriakos Manoli, Xin Yu, Mingbao Feng
Summary: This study presents an advanced oxidation strategy using ruthenium(III) and periodate, which can rapidly eliminate microbial and chemical pollutants in water, including bacteria, bacteriophage MS2, antibiotic resistance genes, and organic micropollutants.
Article
Environmental Sciences
Sujin Shin, Yunho Lee
Summary: Extracellular antibiotic resistance genes (e-ARGs) are emerging water contaminants that are degraded in sunlit surface waters mainly through traditional UV photolysis and reactions with (OH)•, while the relative contribution of singlet oxygen (O-1(2)) to e-ARG degradation is minor.
Article
Chemistry, Multidisciplinary
Yesol Kang, Jaewon Jang, Yunho Lee, In S. Kim
Summary: A loose nanofiltration membrane containing sulfonated graphene oxide (SGO) was fabricated using electrospray interfacial polymerization (EIP) for treating saline dye wastewater, showing high water permeance and superior specific selectivity for dye molecules; the increase in SGO concentration led to improved membrane surface properties, antifouling performance, rejection rates, and water permeation.
ENVIRONMENTAL SCIENCE-NANO
(2021)