Yunho Lee

Yunho Lee
Gwangju Institute of Science and Technology · School of Environmental Science and Engineering

Ph.D

About

108
Publications
27,643
Reads
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Introduction
Yunho Lee is a professor in School of Earth Sciences and Environmental Engineering at Gwangju Institute of Science and Technology (GIST), Korea. His research focuses on characterizing and optimizing oxidative water treatment processes for drinking water and municipal and aquaculture wastewater for abating organic and biological contaminants of concern.
Additional affiliations
June 2011 - August 2020
Gwangju Institute of Science and Technology
Position
  • Professor
Description
  • Environmental Chemistry (Water Chemistry) Environmental Organic Chemistry Drinking Water Quality Engineering Oxidation Processes for Water and Wastewater Treatment
February 2006 - May 2011
Eawag: Das Wasserforschungs-Institut des ETH-Bereichs
Position
  • PostDoc Position
Education
March 2001 - August 2005
Seoul National University
Field of study
  • Chemical & Environmental Engineering

Publications

Publications (108)
Article
Full-text available
Transformation of atenolol (ATN), a micropollutant containing a secondary (2o) amine moiety, can be significantly enhanced in water treatment with sequential and combined use of chlorine and UV (chlorine/UV) through photolysis of the N-Cl bond. This study investigated the transformation kinetics, products, and mechanisms of the amine moiety of ATN...
Article
This study investigated the degradation and deactivation of an extracellular ampicillin resistance gene (ampR) encoded in plasmid pUC19 during exposure to UV254, •OH (generated by UV>290/H2O2), and combined exposure to UV254 and •OH (SO4•−) using UV254/H2O2 and UV254/S2O8²⁻. The degradation rates of ampR measured by quantitative polymerase chain re...
Article
The occurrence and fate of the popular pharmaceutical gabapentin (GBP) in the urban water cycle were investigated with a focus on its transformation during water chlorination. GBP was detected in all samples with average concentrations of 1285 ng/L (n = 24) for wastewater effluent, 304 ng/L for river water (n = 22), and 180 ng/L for drinking water...
Article
This study investigated the UV254 photolysis of free available chlorine and bromine species in water. The intrinsic quantum yields for •OH and X• (X=Cl or Br) generation were determined by model fitting of formaldehyde formation using a tert-butanol assay to be 0.61/0.45 for HOCl/OCl⁻ and 0.32/0.43 for HOBr/OBr⁻, respectively. The steady-state •OH...
Article
Degradation kinetics of antibiotic resistance genes (ARGs) by free available chlorine (FAC), ozone (O3), and UV254 light (UV) were investigated in phosphate buffered solutions at pH 7 using a chromosomal ARG (mecA) of methicillin-resistant Staphylococcus aureus (MRSA). For FAC, the degradation rates of extracellular mecA (extra-mecA) were accelerat...
Article
In this study, a novel MoS2/Bi2MoO6 composite photocatalyst, which was further sensitized using graphene quantum dots (GQDs), was developed to realize multiple photocatalytic applications in antibiotic remediation and Cr(VI) reduction. A simple chemical mixing procedure was used to prepare the GQD-MoS2/BMO composite photocatalyst, which was compreh...
Article
Gravity-driven membrane (GDM) filtration is currently limited by the relatively low permeate flux and poor water quality. This study was aimed to investigate the effects of prechlorination (3 and 5 mgCl2/L) on the permeate flux and water quality in GDM filtration by analyzing the compositions and morphologies of the fouling layer and by evaluating...
Article
This study investigated the reaction kinetics and elimination efficiency of eleven synthetic musks during ozonation and UV254nm-based, advanced oxidation processes (AOPs). The synthetic musks containing olefin moieties with electron-donating alkyl substituents (OTNE and AMBT) showed high reactivity toward ozone (k ≥ 3.7 × 105 M-1 s-1) and free avai...
Article
Conventional wastewater treatment plants (WWTPs) do not fully remove micropollutants. Enhanced treatment of sewage effluents is being considered or implemented in some countries to minimize the discharge of problematic micropollutants from WWTPs. Representative enhanced sewage treatment technologies for micropollutant removal were reviewed, includi...
Article
Chlorine dioxide (ClO2) applications to drinking water are limited by the formation of chlorite (ClO2-) which is regulated in many countries. However, when ClO2 is used as a pre-oxidant, ClO2- can be oxidized by chlorine during subsequent disinfection. In this study, a kinetic model for the reaction of chlorine with ClO2- was developed to predict t...
Article
A combined process of coagulation and powdered activated carbon (PAC) was tested as an alternative primary wastewater treatment option to remove dissolved organic matter and organic micropollutants (OMPs). Bench-scale experiments were performed using three coagulants (Al2(SO4)3, PACl, and FeCl3) and four PAC materials (SPC, F400, BL, and SPO). The...
Article
In this study, a thin-film composite (TFC) loose nanofiltration (NF) membrane comprising a poly(piperazine-amide) (PPA) active layer was successfully fabricated by the electrospray interfacial polymerization (EIP) method. Sulfonated graphene oxide (SGO) and magnetite-decorated SGO (MGO) were synthesized and individually embedded in the polymer matr...
Article
Full-text available
Ultraviolet (UV) radiation alone or in combination with other oxidation processes is increasingly being considered for water disinfection because of stringent regulatory requirements for pathogen inactivation. To fulfill this requirement, an appropriate UV dose or fluence (mJ/cm²) is applied to combat enteric viruses in surface or treated water. Th...
Article
This study investigated the reaction kinetics and degradation efficiency of methylparaben and its halogenated products (Cl-, Br-, Cl,Cl-, Br,Cl-, and Br,Br-methylparabens) during ozonation and UV254/H2O2 treatment. Second-order rate constants for reactions of the parabens with ozone and •OH were kO3 = 10⁷ – 10⁸ M⁻¹ s⁻¹ and k•OH = (2.3 – 4.3)×10⁹ M⁻...
Article
Full-text available
A sulfonated graphene oxide (SGO) composite loose nanofiltration membrane (LNM) with high water permeance was fabricated by the electrospray interfacial polymerization (EIP) method to treat saline dye wastewater. The SGO incorporated EIP membrane showed enhanced characteristics and performances even with a small amount of nanoparticles (0.04 g per...
Article
Ferrate (Fe(VI)), a promising water treatment oxidant, can be used for micropollutant abatement or disinfection byproduct mitigation. However, knowledge gaps remain concerning the interaction between Fe(VI) and dissolved organic matter structures, notably primary amines. This study investigated degradation kinetics and products of several aliphatic...
Article
The goal of this study was to investigate the occurrence and removal of 52 organic micropollutants (OMPs) during each wastewater treatment step in a full-scale wastewater treatment plant (WWTP). Pharmaceuticals such as metformin, acetaminophen, caffeine, ibuprofen, cimetidine and naproxen were found with high average concentrations in the influent....
Article
This study demonstrates that Cu(II) can significantly enhance the decomposition rate of bromamines. Apparent second order rate constants of 2.31 ± 0.01 M⁻¹s⁻¹ and 0.36 ± 0.01 M⁻¹s⁻¹ at pH 7.5 were determined for the reaction of Cu(II) with bromamines and the self-decomposition of bromamines, respectively. Increasing the pH from 6.0 to 8.5, the rate...
Article
Objectives:In the case of pharmaceuticals with high possibility of inflow into the large drinking water treatment plant (DWTP) located in the downstream of the Nakdong River, we tried to evaluate the removal efficiency of pharmaceuticals in the both ozone (O3) and the UV/H2O2 treatment as an alternative of post-O3 process. It was intended to be use...
Article
Due to the large-scale production and use of synthetic chemicals in industralized countries, various chemicals are found in the aquatic environment, which are often termed as micropollutants. Effluents of municipal wastewater treatment plants (WWTPs) have been identified as one of the major sources of these micropollutants. In this article, the cur...
Article
Multitarget engagement is considered an effective strategy to overcome the threat of bacterial infection, and antimicrobials with multiple mechanisms of action have been successful as natural chemical weaponry. Here, we synthesized a library of photosensitizer-peptoid conjugates (PsPCs) as novel antimicrobial photodynamic therapy (aPDT) agents. The...
Article
Degradation and deactivation kinetics of an antibiotic resistance gene (ARG) by ozone (O3) and free available chlorine (FAC) were investigated in phosphate-buffered solutions at pH 7 for O3 (in the presence of tert-butanol), and pH 6.8 or 8.1 for FAC. We used a plasmid (pUC19)-encoded ampicillin resistance gene (ampR) in both extracellular (e-) and...
Article
UV254 irradiation disinfection is a commonly used method to inactivate pathogenic viruses in water and wastewater treatment. Model prediction method can serve as a pre-screening tool to quickly estimate the effectiveness of UV254 irradiation on emerging or unculturable viruses. In this study, an improved prediction model was applied to estimate UV2...
Article
The degradation of ethanolamine (ETA), a recalcitrant pollutant containing a primary amine moiety, can be significantly enhanced in a water treatment with chlorination followed by UV (UV/chlorine) via photolysis of the N-Cl bond of monochloro- (N-Cl ETA) and dichloro-ethanolamine (N-Cl2 ETA) which are formed from the reaction of chlorine with ETA....
Article
Full-text available
Gravity-driven membrane (GDM) filtration is one of the promising technologies for decentralized water treatment systems due to its low cost, simple operation, and convenient maintenance. The objective of this study was to evaluate the permeability of submerged GDM filtration with three different membranes, i.e., polyethersulfone and polyvinylidene...
Article
Recovery of gold from electronic wastes, particularly waste printed circuit boards (WPCBs), has received significant attention due to its high gold content and economic value. This study reports a novel method for efficient and selective recovery of gold from WPCBs using an integrated chlorate leaching and chitosan-based bioadsorption. The experime...
Article
Full-text available
The World Health Organization Global Action Plan recommends integrated surveillance programs as crucial strategies for monitoring antibiotic resistance. Although several national surveillance programs are in place for clinical and veterinary settings, no such schemes exist for monitoring antibiotic-resistant bacteria in the environment. In this tra...
Article
Loose nanofiltration (NF) membrane with excellent dye rejection and high permeation of inorganic salt is required to fractionate dye/salt mixture in dye wastewater treatment. In this study, we fabricated the loose NF membrane by using the electrospray interfacial polymerization (EIP) method. It is a novel and facile interfacial polymerization metho...
Article
N,N-Dimethylhydrazine ((CH3)2–N–N–) compounds in water produce toxic N-nitrosodimethylamine (NDMA) during ozonation, so need removing from water before ozonation. Chlorination can degrade N,N-dimethylhydrazines to give products that do not form NDMA during ozonation, but the chemistry is poorly understood. We studied the kinetics of and mechanisms...
Article
The influents and effluents of coastal flow-through aquacultures in Korea were monitored for four selected antibiotics (amoxicillin-AMX, florfenicol-FLO, oxolinic acid-OXO, and oxytetracycline-OTC). A number of 177 samples were obtained from 16 aquaculture facilities for a monitoring period of two years. OTC was detected in 93 samples with a median...
Article
Full-text available
Oxidative treatment of iodide-containing waters can lead to a formation of potentially toxic iodinated disinfection byproducts (I-DBPs). Iodide (I⁻) is easily oxidized to HOI by various oxidation processes and its reaction with dissolved organic matter (DOM) can produce I-DBPs. Hydrogen peroxide (H2O2) plays a key role in minimizing the formation o...
Article
Recovery of gold from electronic waste (e-waste) has received significant attention due to its high economic value. This study reports glutaraldehyde-crosslinked chitosan (GCC) beads as highly efficient bioadsorbents for the separation of auric ions (Au(III)) from acidic e-waste leaching solutions. With increasing extent of glutaraldehyde-crosslink...
Article
This paper presents ferrate(VI) (FeVIO42-, FeVI) oxidation of a wide range of sulfonamide antibiotics (SAs) containing five- and six-membered heterocyclic moieties (R) in their molecular structures. Kinetics measurements of the reactions between FeVI and SAs at different pH (6.5 – 10.0) give species-specific second-order rate constants, k5 and k6 o...
Article
This work investigated degradation (measured by qPCR) and biological deactivation (measured by culture-based natural transformation) of extra- and intracellular antibiotic resistance genes (eARGs and iARGs) by free available chlorine (FAC), NH2Cl, O3, ClO2, and UV light (254 nm), and of eARGs by •OH, using a chromosomal ARG ( blt) of multidrug-resi...
Article
Full-text available
This study investigated the influence of membrane property and feed water organic matter quality on the permeate flux and water quality during gravity-driven membrane (GDM) filtration. GDM filtration was continuously carried out over 500 days at hydrostatic pressure of 65 mbar in dead-end mode without any back-flushing or membrane cleaning. Three u...
Article
The photodemethylation (PD) is a dominant degradation process of methylmercury (MeHg) in sunlit surface seawater, leading to the decreased bioaccumulation of MeHg in pelagic organisms. This study investigated the PD rate constant of MeHg in artificial estuarine water under UV-A irradiation, with the addition of various types of dissolved organic ma...
Article
Full-text available
When the methylparabens (MPs) remaining in the raw water is introduced into the water treatment process, halogenated parabens are produced by reacting with chlorine. In this study, biodegradation characteristics of halogenated parabens in biological activated carbon (BAC) process were evaluated. The biodegradability of methylparaben (MP) and five h...
Article
Oxidative treatment of iodide-containing waters can form iodinated disinfection by-products (I-DBPs) that are more toxic than the regulated DBPs. To better understand the fate of iodine during water treatment with ferrate(VI), kinetics, products, and stoichiometries for the reactions of ferrate(VI) with iodide (I⁻) and hypoiodous acid (HOI) were de...
Article
Full-text available
In this study, methyl paraben (MP), ethyl paraben (EP), propyl paraben (PP), and butyl paraben (BP) were analyzed to identify their occurrence characteristics at various sampling sites (the effluent from the wastewater treatment plant, the main stream and tributaries to which the effluent is introduced) in the Nakdong River basin during various sam...
Article
Full-text available
To better understand the elimination of transforming activity of antibiotic resistance genes (ARGs), this study determined deactivation of transforming activity of an ARG (in Escherichia coli as a host) and...
Article
The presence of toxic microcystins in algal-impacted surface waters is a concern for drinking water quality management. In this study, the potential of ferrate(VI) to eliminate microcystins during drinking water treatment was assessed by investigating reaction kinetics, reaction sites, transformation products, and toxicity changes for the oxidation...
Article
The reaction kinetics, products, and pathways of methylparaben (MeP) during water chlorination with and without bromide (Br-) were investigated to better understand the fate of parabens in chlorinated waters. During the chlorination of MeP-spiked waters without Br-, MeP was transformed into mono-Cl-MeP and di-Cl-MeP with apparent second-order rate...
Article
The potential of ferrate(VI) to oxidize algal-derived taste and odor (T&O) compounds during water treatment was assessed by investigating the reaction kinetics of ferrate(VI) with selected T&O compounds. Apparent second-order rate constants (kapp) were determined in phosphate buffered waters in the pH range of 6–9. The olefinic T&O compounds show a...
Article
The objective of this study was to investigate reduction in antibiotic resistance genes (ARGs) via targeting solid waste in effluent from a flow-through aquaculture in South Korea. The level of suspended solids in the filtrates was approximately 12.5±2.3mg/L, corresponding to a removal efficiency of 68.8±5.7% irrespective of variations in the size...
Article
The wide use of antibiotics in aquaculture for prophylactic and therapeutic purposes can potentially lead to the prevalence of antibiotic resistance genes (ARGs). This study reports for the first time the profile of ARGs from effluents of coastal aquaculture located in South Jeolla province and Jeju Island, South Korea. Using quantitative PCR (qPCR...
Article
This study assessed the inactivation efficiency of plasmid-encoded antibiotic resistance genes (ARGs) both in extracellular form and present within Escherichia coli (intracellular form) during water treatment with chlorine, UV (254 nm), and UV/H2O2. A quantitative real-time PCR (qPCR) method was used to quantify the ARG damage to ampR (850 bp) and...
Chapter
Full-text available
Ferrate(VI) can be used to oxidize various trace organic contaminants (TrOCs) in municipal water and wastewater treatments. The efficiency of ferrate(VI) oxidation for TrOC elimination depends on the reactivity of ferrate(VI) with a target TrOC and the dosage and stability of ferrate(VI) in a given water matrix. This article reviews recent advances...
Article
Full-text available
Pesticide contamination in the environment is a contemporary global issue. As agricultural production through crop planting in Malaysia now supports both energy and food productions, the concentration and distribution of pesticides in surface water may have changed. Therefore, this study assesses the concentration and distribution of organophosphor...
Article
Compounds with N,N-dimethylhydrazine moieties ((CH3)2N-N-) form N-nitrosodimethylamine (NDMA) during ozonation, but the relevant reaction chemistry is hitherto poorly understood. This study investigated the reaction kinetics and mechanisms of NDMA formation during ozonation of unsymmetrical dimethylhydrazine (UDMH) and daminozide (DMZ) as structura...
Article
This study demonstrates that tin porphyrin (SnP) loading on a silica substrate (SnP/silica) markedly accelerates the degradation of Microcystins (MCs) under visible light irradiation, despite a reduction of photosensitized singlet oxygen (1O2) production. A comparative study using Rose Bengal, SnP, and C60 aminofullerene suggested that the MC-RR de...
Article
Inactivation kinetics of autochthonous bacteria during ozonation of wastewater effluents were investigated using cultivation-independent flow cytometry (FCM) with total cell count (TCC) and intact cell count (ICC) and intracellular adenosine triphosphate (ATP) analysis. The principles of the methods including ozone inactivation kinetics were demons...
Article
Full-text available
Ozonation of municipal wastewater effluent has been considered in recent years as an enhanced wastewater treatment technology to abate trace organic contaminants (micropollutants). The efficiency of ozonation for micropollutant abatement depends on (1) the reactivity of ozone and OH radical (˙OH) with the target micropollutant, (2) the dosage of oz...
Article
Full-text available
UV/H2O2 processes can be applied to improve the quality of effluents from municipal wastewater treatment plants by attenuating trace organic contaminants (micropollutants). This study presents a kinetic model based on UV photolysis parameters, including UV absorption rate and quantum yield, and hydroxyl radical (●OH) oxidation parameters, including...
Article
Recent evaluations of potable reuse treatment trains suggest that the use of UV and UV/H2O2 may become increasingly common, particularly in systems employing ozone and/or biofiltration. This study provides a summary of photolysis rate constants and OH rate constants and demonstrates the applicability of semiempirical relationships predicting OH exp...
Article
Full-text available
This study used key description parameters of the ozonation process in lake water samples over a 1-year period to better understand the influence of seasonal variations in water quality such as water temperature and dissolved organic matter on ozone decomposition and OH radical formation and reaction kinetics. The parameters were the initial ozone...
Article
A substrate-immobilized (SI) TiO2 nanofiber (NF) photocatalyst for multiple uses was prepared through electrospinning and hot pressing. The rate of furfuryl alcohol degradation under UV irradiation was found to be the highest when the anatase to rutile ratio was 70:30; the rate did not linearly increase as a function of the NF film thickness, mainl...
Article
Determining optimal ozone doses for organic micropollutant elimination during wastewater ozonation is challenged by the presence of a large number of structurally diverse micropollutants for varying wastewater matrice compositions. A chemical kinetics approach based on ozone and hydroxyl radical (·OH) rate constant and measurements of ozone and ·OH...