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Kang Hoon Lee
Department of Civil &Environmental Engineering, Hanyang University, 222 Seongdong-gu, Seoul 04763, Korea

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Journal article
Published: 01 December 2020 in Water
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In this study, a microbial community of bacteria was investigated for 1,4-dioxane(1,4-D) biodegradation. The enriched culture was investigated for 1,4-dioxane mineralization, co-metabolism of 1,4-dioxane and extra carbon sources, and characterized 1,4-dioxane biodegradation kinetics. The mineralization test indicates that the enriched culture was able to degrade 1,4-dioxane as the sole carbon and energy source. Interestingly, the distribution of 1,4-dioxane into the final biodegrading products were 36.9% into biomass, 58.3% completely mineralized to CO2, and about 4% escaped as VOC. The enriched culture has a high affinity with 1,4-dioxane during biodegradation. The kinetic coefficients of the Monod equation were qmax = 0.0063 mg 1,4-D/mg VSS/h, Ks = 9.42 mg/L, YT = 0.43 mg VSS/mg 1,4-dioxane and the decay rate was kd = 0.023 mg/mg/h. Tetrahydrofuran (THF) and ethylene glycol were both consumed together with 1,4-dioxane by the enriched culture; however, ethylene glycol did not show any influence on 1,4-dioxane biodegradation, while THF proved to be a competitive.

ACS Style

Kang Lee; Young Wie; Yong-Soo Lee. Characterization of 1,4-Dioxane Biodegradation by a Microbial Community. Water 2020, 12, 3372 .

AMA Style

Kang Lee, Young Wie, Yong-Soo Lee. Characterization of 1,4-Dioxane Biodegradation by a Microbial Community. Water. 2020; 12 (12):3372.

Chicago/Turabian Style

Kang Lee; Young Wie; Yong-Soo Lee. 2020. "Characterization of 1,4-Dioxane Biodegradation by a Microbial Community." Water 12, no. 12: 3372.

Journal article
Published: 11 May 2020 in Construction and Building Materials
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This study investigated the effect of the aeration rate of molded pellets on the physical and chemical bloating mechanisms of artificial lightweight aggregate materials. Samples were prepared by mixing acid clay as a raw material with Fe2O3 and carbon. The samples were manufactured by various molding methods, in this case hand molding, uniaxial pressure molding, cold isostatic pressure molding, and extrusion molding. The particle density and pore distribution of the molded pellets were confirmed, and the changes in the properties and bloating activation temperatures of the aggregates were observed. The density of each molded pellet differed according to the molding method, and it was confirmed that molded pellets having a lower aeration rate bloated at a lower temperature. When the pressure from the gas inside is high at a temperature where viscous behavior does not occur, cracks form inside the aggregate. In the samples to which Fe2O3 and C were added, the internal viscous behavior did not cause cracking due to due to the formation of black cores. In the molded pellets with low aeration rates, the black core formed at a lower temperature, and the bloat-promoting effect was confirmed.

ACS Style

Young Min Wie; Ki Gang Lee; Kang Hoon Lee. Physicochemical effect of the aeration rate on bloating characterizations of artificial lightweight aggregate. Construction and Building Materials 2020, 256, 119444 .

AMA Style

Young Min Wie, Ki Gang Lee, Kang Hoon Lee. Physicochemical effect of the aeration rate on bloating characterizations of artificial lightweight aggregate. Construction and Building Materials. 2020; 256 ():119444.

Chicago/Turabian Style

Young Min Wie; Ki Gang Lee; Kang Hoon Lee. 2020. "Physicochemical effect of the aeration rate on bloating characterizations of artificial lightweight aggregate." Construction and Building Materials 256, no. : 119444.

Articles
Published: 12 February 2020 in Journal of Asian Ceramic Societies
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The purpose of this study is to control the viscous behavior of lightweight aggregates through the chemical design of a lightweight aggregates material in order to solve the problem of the adhesion of lightweight aggregates by viscous behavior in the bloating activation temperature range of lightweight aggregates. In order to induce a reduction of Fe2O3 inside the aggregates, Fe2O3 and carbon were added to acid clay so as to produce aggregate. The particle density and the water absorption rate of the aggregates were measured, the cross-section was observed with an optical microscope, and the distribution of hematite of the lightweight aggregates was confirmed by a 3D CT analysis. Pilot scale rotary kiln experiments were performed. The optimal additive contents for the production of lightweight aggregates using acid clay were 8–13 wt% of Fe2O3 and 2–3 wt% of carbon. The addition of additives decreased the bloating activation temperature, and viscous behavior was promoted in the core portion of the aggregates, resulting in a difference in the melting point between the shell and the core. As a result, the occurrence of adhesion at the aggregates surface was suppressed.

ACS Style

Young Min Wie; Ki Gang Lee; Kang Hoon Lee. Chemical design of lightweight aggregate to prevent adhesion at bloating activation temperature. Journal of Asian Ceramic Societies 2020, 8, 245 -254.

AMA Style

Young Min Wie, Ki Gang Lee, Kang Hoon Lee. Chemical design of lightweight aggregate to prevent adhesion at bloating activation temperature. Journal of Asian Ceramic Societies. 2020; 8 (2):245-254.

Chicago/Turabian Style

Young Min Wie; Ki Gang Lee; Kang Hoon Lee. 2020. "Chemical design of lightweight aggregate to prevent adhesion at bloating activation temperature." Journal of Asian Ceramic Societies 8, no. 2: 245-254.

Research article
Published: 17 April 2019 in Advances in Materials Science and Engineering
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The purpose of this study was to improve the recycling rate of industrial wastes by investigating the bloating mechanism of artificial lightweight aggregate depending on the ramping rate and time, which is a dynamic parameter in the production of artificial lightweight aggregate. In this study, coal bottom ash and dredged soil at a weight ratio of 1 : 1 from a domestic power plant were used as raw materials. The artificial lightweight aggregates were formed by using an extruder and pelletizer (φ = 10 mm) and sintered by rapid sintering, 2-step firing, and normal sintering method. The physical properties of the aggregates such as bulk density, water absorption ratio, and microstructure of cross section are investigated with the sintering time and temperature. As the result of bloating and trapping mechanism, black core could be inhibited as the firing time increased at the temperature before surface formation. As a result of firing schedule graphs using least square method, it was possible to manufacture artificial lightweight aggregate with micropores, specific gravity of 1.1, and absorption rate of 3% at a heating rate of 27°c/min or less.

ACS Style

Kang Hoon Lee; Jae Hoon Lee; Young Min Wie; Ki Gang Lee. Bloating Mechanism of Lightweight Aggregates due to Ramping Rate. Advances in Materials Science and Engineering 2019, 2019, 1 -12.

AMA Style

Kang Hoon Lee, Jae Hoon Lee, Young Min Wie, Ki Gang Lee. Bloating Mechanism of Lightweight Aggregates due to Ramping Rate. Advances in Materials Science and Engineering. 2019; 2019 ():1-12.

Chicago/Turabian Style

Kang Hoon Lee; Jae Hoon Lee; Young Min Wie; Ki Gang Lee. 2019. "Bloating Mechanism of Lightweight Aggregates due to Ramping Rate." Advances in Materials Science and Engineering 2019, no. : 1-12.

Journal article
Published: 20 December 2018 in Sustainability
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The zinc oxide nanoparticles (ZnO NPs) and surfactants that are widely used in commercial and industrial products lead to the likelihood of their co-occurrence in natural water, making it essential to investigate the effect of surfactants on the fate and mobility of ZnO NPs. The present study seeks to elucidate the effect of an anionic sodium dodecyl sulfate (SDS) and a nonionic nonylphenol ethoxylate (NPEO), on ZnO NPs adsorption, aggregation, dissolution, and removal by the coagulation process. The results indicate that the presence of SDS in ZnO NPs suspension significantly reduced the ζ-potential and hydrodynamic diameter (HDD), while the effect of NPEO was found not to be significant. The sorption of SDS and NPEO by ZnO NPs were fitted with Langmuir model, but the Freundlich isotherm was more suitable for SDS at pH 9.0. Moreover, the adsorption was strongly pH-dependent due to the formation of mono-bilayer patches onto the NPs. The SDS remarkably affect the dissolution and aggregation phenomena of ZnO NPs in natural waters as compared to NPEO. Finally, the coagulation results showed that the removal efficiency of ZnO, Zn2+ and the surfactant in synthetic and wastewaters at optimum ferric chloride (FC) dosage reached around 85–98% and 20–50%, respectively. Coagulation mechanism investigation demonstrated that the cooperation of charge neutralization and adsorptive micellar flocculation (AMF) might play an important role. In summary, this study may provide new insight into the environmental behavior of coexisting ZnO NPs and surfactants in water treatment processes, and it may facilitate their sustainable use in commercial products and processes.

ACS Style

Rizwan Khan; Muhammad Inam; Muhammad Iqbal; Muhammad Shoaib; Du Park; Kang Lee; SooKyo Shin; Sarfaraz Khan; Ick Yeom. Removal of ZnO Nanoparticles from Natural Waters by Coagulation-Flocculation Process: Influence of Surfactant Type on Aggregation, Dissolution and Colloidal Stability. Sustainability 2018, 11, 17 .

AMA Style

Rizwan Khan, Muhammad Inam, Muhammad Iqbal, Muhammad Shoaib, Du Park, Kang Lee, SooKyo Shin, Sarfaraz Khan, Ick Yeom. Removal of ZnO Nanoparticles from Natural Waters by Coagulation-Flocculation Process: Influence of Surfactant Type on Aggregation, Dissolution and Colloidal Stability. Sustainability. 2018; 11 (1):17.

Chicago/Turabian Style

Rizwan Khan; Muhammad Inam; Muhammad Iqbal; Muhammad Shoaib; Du Park; Kang Lee; SooKyo Shin; Sarfaraz Khan; Ick Yeom. 2018. "Removal of ZnO Nanoparticles from Natural Waters by Coagulation-Flocculation Process: Influence of Surfactant Type on Aggregation, Dissolution and Colloidal Stability." Sustainability 11, no. 1: 17.