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Biological reduction of nitrate and perchlorate in brine water using up-flow packed bed reactors.
Chung, Jinwook,Shin, Sunghoon,Oh, Jeill Marcel Dekker 2010 Journal of Environmental Science and Health. Part Vol.45 No.9
<P>Denitrifying up-flow packed bed bioreactors (UPBRs) were evaluated for their capacity to simultaneously remove nitrate and perchlorate from ion exchange regenerant brines. A continuous-flow UPBR, which was inoculated with denitrifying bacteria obtained from a municipal wastewater plant, completely removed perchlorate as well as nitrate in conditions of up to 10% salinity. When nitrate and perchlorate were added to the UPBR, they were removed immediately. To investigate factors that affected the contaminant removal, acetate (as an electron donor) and sulfate (as a competing electron acceptor) were added at different salinities. Lower carbon loading decreased the nitrate and perchlorate reductions, but increased sulfate loading did not decrease the reductions of nitrate and perchlorate. In conclusion, the UPBR is a useful and powerful technology that simultaneously removes nitrate and perchlorate in brine.</P>
Chung, Jinwook,Kim, Seungjin,Choi, Kwangkeun,Kim, Jong-Oh Informa UK (TaylorFrancis) 2016 Environmental Technology Vol.37 No.4
<P>Microbacterium barkeri KCCM 10507 and Paenibacillus amylolyticus KCCM 10508 were isolated and identified for the degradation of polyvinyl alcohol (PVA) contained in textile waste water. Kinetic parameters such as growth rate and substrate utilization rate were determined using a pure culture of two isolated strains. The degradation rate by a mixed culture of two isolated strains was higher than that by single strain only. Also, the effect of polymerization degree on biodegradation was negligible, but initial PVA concentration was very sensitive to biodegradation. Forty-two per cent of PVA and 55% of chemical oxygen demand in textile waste water were removed by a mixed culture of two isolated strains after 5 days.</P>
Chung, Seungjoon,Kim, Seungjin,Kim, Jong-Oh,Chung, Jinwook American Chemical Society 2014 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.53 No.39
<P>The feasibility of reverse osmosis (RO) separation combined with ferrite reaction was investigated for the reclamation and recovery of heavy metals from metal plating wastewater. Disc tube-type RO modules were used for simultaneous purification and concentration of wastewaters containing zinc and chromium ions. A subsequent ferrite reaction was performed to recover zinc ions from RO concentrates. The operating conditions of the RO and ferrite reaction were determined in several lab-scale experiments with several types of model wastewater. Pilot-scale RO test results revealed that the zinc plating wastewater treated by one-pass RO and the chrome plating wastewater treated by two-pass RO were acceptable for preplating rinsewater. After ferrite reaction, 99.7% of zinc ions were recovered from the second-stage RO concentrate in the form of zinc ferrite, while significant amounts of chromium ions were retained in the concentrate. As a result of economic analysis, we suggested a retrofitting option, including a combined RO and ferrite process, for a wastewater treatment facility in a local metal plating company.</P>
( Jinwook Chung ) 대한운동사협회 2022 대한운동사협회 운동사대회자료집 Vol.2022 No.-
Children with developmental disabilities generally show a lower level of physical strength compared to those with no disabilities due to their inactive lifestyle, low level of motivation, and various psychological factors. In addition, because of the differences in their behavioral characteristics and cognitive functions, opportunities to participate in physical exercise programs are also lacking. Currently, it is extremely difficult to find personalized exercise programs and services that considers the physical, cognitive, and social capabilities of children with developmental disabilities. Therefore, to fill this gap and provide a proper ICT exercise program that takes into account the behavioral characteristics and cognitive functions of children with development disabilities we have developed the ‘DUE’ exercise program. This exercise program consists of a mobile-based cognitive functions/social-skills evaluation, a video-based motor function evaluation, and is carefully designed based on the results evidence-based researches. The program includes 19 types of cognitive/social/motor function evaluation items, 8 types of convergence index, and 72 types of convergence intervention programs. The evaluation of the convergence intervention program is carried out based on a 3-level scale (high/middle/low). The cognition level is evaluated by assessing the participant’s spatial working memory, visual processing, executive function, etc. using a tablet PC. The social ability of the child is also evaluated using a tablet PC, and includes items such as following instruction, imitation, joint attention etc. Physical skills are evaluated by using a motion- tracking camera by observing the child’s physical movements (i.e., quickness, endurance, etc.). The exercise program will be designed and operated based on a game-type application that utilizes Virtual Reality. In addition, customized exercise programs shall be provided depending on the participant’s cognitive, social, and physical abilities. It is also important to implement various features such as character avatars, better graphics, BGM, etc. to draw interest and keep the participants engaged to the program.
P-35: The Effects of NiSi2 Seed Control on SGS Crystallization and TFT Characteristics
Chung, Yun Mo,Lee, Ki-Yong,Seo, Jinwook,Chung, Minjae,Park, Byoung Keon,Lee, Donghyun,Kim, Hye Dong,Kim, Sang Soo Wiley Blackwell (John Wiley Sons) 2011 Society for Information Display International Symp Vol.42 No.1
Chung, Jinwook,Kim, Seu-Run,Kim, Jong-Oh IWA Publishing 2015 Water Science & Technology Vol.72 No.8
<P>CdS doped TiO<SUB>2</SUB> nanotube composite was fabricated by chemical bath deposition, and was characterized by the structural, spectral and photoelectrochemical properties. The results of the structural and spectral properties showed that CdS particles were successfully deposited onto the surface of TiO<SUB>2</SUB> nanotube. It is demonstrated that CdS doped TiO<SUB>2</SUB> nanotube composite improved the light harvesting ability. Power conversion efficiency of about 0.32% was observed. This value is about 2.9 times higher than that of pure TiO<SUB>2</SUB> nanotube. The CdS doped TiO<SUB>2</SUB> nanotube composite possesses relatively higher photocatalytic activity and photodegradation efficiency than that of pure TiO<SUB>2</SUB> nanotube under UV light irradiation, and the degradation efficiency of methyl orange was about 42% at UV intensity of 32 W.</P>
Chung, Jinwook,Bae, Wookeun,Lee, Yong-Woo,Ko, Gwang-Beom,Lee, Sang-Uk,Park, Seong-Jun Taylor Francis 2004 Journal of Environmental Science and Health. Part Vol.39 No.7
<P>A shortcut biological nitrogen removal (SBNR) process was operated to treat an ammonium rich landfill leachate using a pilot-scale reactor. The SBNR process was intended to oxidize ammonia to nitrite and, then, to reduce it to nitrogen gas. When the hydraulic retention time was 4–3 days, a half of the ammonium oxidized was accumulated as nitrite in the oxidation tank. The nitrite was denitrified completely in the anoxic tank when recycled. The average free ammonia (FA) concentration in the ammonium oxidation tank was 3.7 mg/L. The specific substrate utilization rates of ammonium oxidizers and nitrite oxidizers were investigated at varying FA concentrations through batch experiments. The highest specific ammonium oxidation rate was observed when the FA concentration was 10 mg/L. The rate decreased slightly when the FA concentration was increased to 20 or 50 mg/L, or decreased significantly when it was 5 mg/L. In case of nitrite oxidation, the specific nitrite utilization rate decreased significantly with increasing FA concentration up to 10 mg/L. Consequently, the optimal FA concentration in leachate treatment was 10 mg/L for maximum nitrite accumulation and maximum ammonium removal, or 5 mg/L for lower ammonium concentration and reasonable nitrite accumulation.</P>