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Removal of TPH, UCM, PAHs, and Alk-PAHs in oil-contaminated soil by thermal desorption
Choi Byeongwook,Lee Sungjong,Jho Eun Hea 한국응용생명화학회 2020 Applied Biological Chemistry (Appl Biol Chem) Vol.63 No.6
Oil-contaminated soils from a former landfill and gas station site in Korea were treated by thermal desorption. The removal efficiencies of the different oil components such as total petroleum hydrocarbons (TPH), polyaromatic hydrocarbons (PAHs), unresolved complex mixtures (UCM), and alkylated PAHs (Alk-PAHs) by thermal desorption were determined. The effects of temperatures (200, 400, and 600 °C) and treatment times (15, 30, 45, and 60 min) on the thermal desorption efficiency were studied. The treatment efficiency increased with increasing temperature from 200 to 400 °C and with increasing treatment time. Almost complete removals of TPH, UCM, PAHs, and Alk-PAHs were observed after 15 min at 400 °C. The treatment temperatures of 400 and 600 °C did not show a significant difference (p-value > 0.05). Overall, this study shows that the different components of oil in the oil-contaminated soils can be treated effectively in a relatively short time by thermal desorption, and such high removal efficiency in a relatively short time for the oil-contaminated soils can be of advantage for the treatment of highly contaminated or weathered soils where biological treatment efficiency is low.
생물학적 하수처리공정에서 스마트 센서(C/N비 자동연속측정)를 적용한 유입수 분할주입에 따른 질소제거 변화에 관한 연구
최병욱 ( Byeongwook Choi ),김태형 ( Taehyeong Kim ),김영호 ( Youngho Kim ),강세웅 ( Sewoong Kang ),김정희 ( Junghee Kim ),원종엽 ( Jongyeob Won ),전용욱 ( Yongwook Jeon ),강태윤 ( Taeyoun Kang ),정동환 ( Namun Cho ),조남운 ( Dongh 한국물환경학회 2021 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2021 No.-
이연준,양지원,Byeongwook Choi,박성직,이창구,조은혜 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.3
Procymidone (PCM), an agricultural fungicide, is attracting attention because it has been detected in all ecosystems, including aquatic environments. This study explored changes in the behavior and toxicity of PCM in water under the influence of photolysis and microplastics (MPs) coexistence. Hydrolysis of PCM was evaluated and UV-A and UV-C lamps were used as light sources for the photodegradation experiments. The Microtox® assay was used to evaluate changes in toxicity during the photodegradation and after sorption on MPs of low-density polyethylene (LDPE) and polyvinyl chloride (PVC) films. The appearance of 3,5-dichloroaniline (DCA), a major metabolite of PCM that is more toxic than its parent compound in water, was confirmed. Both PCM and DCA showed sufficient molar extinction coefficients to be photolyzed under UV-C irradiation (εPCM=10,300 M−1 cm−1 and εDCA=2,400 M−1 cm−1); however, the presence of natural organic matter negatively affected their photodegradation. PVC showed a better sorption potential for PCM and DCA than for LDPE. The higher sorption by PVC significantly reduced the toxic effect of DCA from an average value of 79% to 60% and increased the EC50 value from 30.4% to 47.6%. These results offer insights into controlling toxic micropollutants, including fungicides, in aquatic environments and water treatment processes.
Biodegradable, electro-active chitin nanofiber films for flexible piezoelectric transducers
Kim, Kyungtae,Ha, Minjeong,Choi, Byeongwook,Joo, Se Hun,Kang, Han Sol,Park, Ju Hyun,Gu, Bongjun,Park, Chanho,Park, Cheolmin,Kim, Jongbok,Kwak, Sang Kyu,Ko, Hyunhyub,Jin, Jungho,Kang, Seok Ju Elsevier 2018 Nano energy Vol.48 No.-
<P><B>Abstract</B></P> <P>Since the conventional fluorine-based electro-active polymers release toxic residues into the environment during their syntheses and decomposition processes, eco-friendly piezoelectric polymers are urgently demanded in the field of energy-related soft materials. Here, we derive a high-performance biodegradable chitin polymer from squid pen material and demonstrate its utility as a flexible piezoelectric material. The readily controlled ferroelectric chitin film confers excellent piezoelectricity under external mechanical pressure, resulting in comparable performance with that of conventional fluorine-based piezoelectric polymers. In particular, the sufficient piezoelectric behavior in chitin film allows us to not only realize a high-fidelity paper-type speaker and microphone that operates over a wide frequency range without significantly deteriorating the input and output sounds but also demonstrate transparent speaker consisting of AgNWs electrodes onto freestanding chitin film which also enables to resemble the original sound. Finally, the biodegradable chitin polymer can be successfully dissolved by chitinase enzyme within eight days without any toxic residues remained.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ferroelectric characteristic is confirmed by polarization measurement. </LI> <LI> β-chitin film enables to demonstrate high-fidelity paper-type speaker and microphone. </LI> <LI> The biodegradable nature of chitin film can be dissolved within eight days. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>We present a novel biodegradable piezoelectric material from chitin material, the second-most abundant polysaccharide biopolymer. The decent polarization arising from the chitin molecules not only facilitates the piezoelectric response upon the external pressure but also generates the harmonic frequencies of the input music source. Moreover, the environmentally friendly chitin film can be completely dissolved in a water-based solution without generating toxic products.</P> <P>[DISPLAY OMISSION]</P>