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Jihyun R. Kim,Eunsung Kan 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
Heterogeneous photo-Fenton oxidation using CdS/multi-walled carbon nanotube-TiO2 (CdS/MWCNTTiO2)under visible light relied on combination of the photocatalytic, photo-Fenton and photosensitizingoxidation. The photo-Fenton reactions resulted in much faster and higher removal ofmethylene blue and total organic carbon than the dark Fenton oxidation and the photocatalyticdegradation alone at the selected conditions. The optimummolar ratio of [methylene blue]:[H2O2]:[Fe3+](1:12:3.4) in the photo-Fenton oxidation indicated cost-effectiveness of the process. The scavengingtests of the hydroxyl radicals and the valence holes suggested that the hydroxyl radical-driven oxidationwas the major step among the multiple reactions in the photo-Fenton oxidation.
Hyun Min Jang,Seunghyun Yoo,Sunkyu Park,Eunsung Kan 대한환경공학회 2019 Environmental Engineering Research Vol.24 No.4
The adsorption of sulfamethoxazole (SMX) onto a NaOH-activated pine wood-derived biochar was investigated via batch experiments and models. Surprisingly, the maximum adsorption capacity of activated biochar for SMX (397.29 ㎎/g) was superior than those of pristine biochars from various feedstock, but comparable to those of commercially available activated carbons. Elovich kinetic and Freundlich isotherm models revealed the best fitted ones for the adsorption of SMX onto the activated biochar indicating chemisorptive interaction occurred on surface of the activated biochar. In addition, the intraparticle diffusion limitation was thought to be the major barrier for the adsorption of SMX on the activated biochar. The main mechanisms for the activated biochar would include hydrophobic, π-π interactions and hydrogen bonding. This was consistent with the changes in physicochemical properties of the activated biochar (e.g., increase in sp2 and surface area, but decrease in the ratios of O/C and H/C).
Hyun Min Jang,Jeff Brady,Eunsung Kan 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.1
The present study investigates possible roles of manure-derived biochar (MBC) in anaerobic digestion (AD) of dairy manure. Addition of MBC led to an increase in cumulative methane yield and a decrease in lag phase under all tested conditions (concentration of MBC: 1 and 10 g/L, temperature: 20, 35 and 55°C). For example, the cumulative methane yield in the mesophilic AD with 10 g/L MBC were 24.51% higher than that of the AD without MBC. Additionally, lag phage of mesophilic AD with 10 g/L MBC decreased from 2.08 d to 1.52 d. Microbial community analysis indicated that the addition of MBC to mesophilic and thermophilic AD of dairy manure increased the relative abundance of Ruminofilibacter which related to the hydrolysis. In addition, the addition of MBC to AD potentially stimulated the growth of syntrophic bacteria (e.g., genera Clostridium, Syntrophomonas and Syntrophus) and hydrogenotrophic methanogens (e.g., genera Methanobacterium, Methanolinea and Methanomassiliicoccus). Furthermore, microbial community analysis also suggested that mediate interspecies electron transfer and direct interspecies electron transfer would be accelerated by addition of MBC which showed high electrical conductivity (3230 μS/cm).
Adsorption of phosphate in water on a novel calcium hydroxide-coated dairy manure-derived biochar
Yong-Keun Choi,Hyun Min Jang,Eunsung Kan,Anna Rose Wallace,Wenjie Sun 대한환경공학회 2019 Environmental Engineering Research Vol.24 No.3
The present study investigated a novel calcium hydroxide-coated dairy manure-derived biochar (Ca-BC) for adsorption of phosphate from water and dairy wastewater. The Ca-BC showed much higher adsorption of phosphate than that of dairy manure-derived biochar. The Ca-BC possessed mainly the calcium hydroxide and various functional groups resulting in high reactivity between phosphate and calcium hydroxide in the Ca-BC. The adsorption of phosphate onto Ca-BC followed pseudo-second order kinetic and Freundlich isotherm models indicating chemisorptive interaction occurred on energetically heterogeneous surface of Ca-BC. The maximum adsorption capacity of the Ca-BC was higher than those of iron oxide and zinc oxide-coated biochars, but lower than those of CaO- and MgO-coated biochars. However, the Ca-BC showed high reactivity per surface area for adsorption of phosphate indicating importance of surface functionalization of biochar. On the other hand, the adsorption of phosphate in dairy wastewater on Ca-BC was lower than that in water owing to competition between other anions in wastewater and phosphate. Overall, the Ca-BC would be a low cost and effective adsorbent for recovery of phosphate from water and wastewater.
Jang, Hyun Min,Lee, Jangwoo,Choi, Sangki,Shin, Jingyeong,Kan, Eunsung,Kim, Young Mo Elsevier 2018 Bioresource technology Vol.267 No.-
<P><B>Abstract</B></P> <P>Response of antibiotic resistance genes (ARGs) and heavy metal resistance genes (HMRGs) to two different temperature sequences (i.e., mesophilic-thermophilic and thermophilic-mesophilic) were investigated. Higher removal of total ARGs (twenty-one targeted subtypes) and HMRGs (three targeted subtypes) was achieved by the mesophilic-thermophilic sequence than by the thermophilic-mesophilic sequence. The sequence of mesophilic-thermophilic showed the highest removal of total ARGs, but the sequence of thermophilic-mesophilic proved more suitable for removal of class 1 integrons (<I>intI1</I>). Correlation analysis indicated that <I>intI1</I> correlated significantly with <I>tetG</I>, <I>tetQ</I>, <I>tetX</I>, <I>sul2</I>, <I>aac(6′)-lb-cr</I>, <I>bla</I> <SUB>TEM</SUB>, <I>ermB</I> and <I>floR</I>. High-throughput sequencing revealed that the mesophilic-thermophilic sequence TPAD removed more human bacterial pathogens (HBPs) than did the thermophilic-mesophilic sequence. Also, significantly positive correlation was observed between ARGs and HBPs. For instance, <I>Mycoplasma pneumonia</I> showed significantly positive correlation with several ARGs including <I>tetE</I>, <I>tetQ</I>, <I>tetX</I>, <I>tetZ</I>, <I>sul1</I>, <I>sul2</I>, <I>aac(6′)-lb-cr</I> and <I>floR</I>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Response of ARGs and HMRGs to TPAD of WAS were investigated. </LI> <LI> Highest removal of total ARGs was achieved by mesophilic-thermophilic AD. </LI> <LI> TPAD was effective removing human bacterial pathogens. </LI> <LI> Some HBPs showed a positive correlation with ARGs, HMRGs and <I>intI1</I>. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Cho, Il Kyu,Park, Byung-Jun,Chung, Kyu Hyuck,Li, Qing X.,Kan, Eunsung The Korean Society of Pesticide Science 2017 농약과학회지 Vol.21 No.3
This study focused on Fenton oxidation of bisphenol A using a $Fe_3O_4-coated$ multi-walled carbon nanotube ($Fe_3O_4$/MWCNT), from which oxidation products, acute toxicity and estrogenic activity were assessed. The final effluents showed no biological toxicity to 24 h born Daphnia magna and negligible in-vivo estrogenic activity. The major oxidation productions generated from heterogeneous Fenton oxidation of bisphenol A included 4-hydroxyacetophenone, 4-hydroxybenzoic acid, catechol and hydroquinone. Therefore, Fenton oxidation of bisphenol A using $Fe_3O_4$/MWCNT with a low dose of $H_2O_2$ led to high removal of bisphenol A with negligible aquatic toxicity and estrogenic activity. It would be a cost-effective solution for treatment and reuse of emerging contaminant-containing wastewater and water.