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Lab-Scale 반응기를 이용한 PCNs 함유 폐기물의 소각처리 가능성 연구

권은혜 ( Eunhye Kwon ),배지수 ( Jisu Bea ),김우일 ( Wooil Kim ),윤영삼 ( Youngsam Yoon ),이원석 ( Wonseok Lee ),박호연 ( Hoyeun Park ) 한국폐기물자원순환학회 2021 한국폐기물자원순환학회지 Vol.38 No.4
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- 복사/대출신청
Polychlorinated naphthalenes (PCNs), one of Persistent Organic Pollutants (POPs), and are colorless crystalline substances with similar structure and physical and chemical properties with PCB (polychlorinated biphenyl), and are produced by the chlorination of naphthalene. PCN is one of POPs are rarely degraded in the environment; consequently, they negatively impact the environment by threatening human health and the ecosystem. In this study, the potential of a stable treatment for lab-scale-incinerated waste containing PCNs was evaluated. For this study, waste containing PCNs were selected as the surface coating agent, mixed sample, and technical sample. The results revealed that when the PCNs concentration was 34.552 ~ 2,582.463 ng/g, the concentrations of Mono-CN and Tetra-CN were higher than those of other homologues. The incineration treatment conditions were derived by measuring three parts, after which the elemental composition was analyzed and the calorific value, theoretical air content, and residence time were calculated. Using the temperature of the target sample, thermogravimetric analysis revealed that the incineration treatment can be achieved at the incineration temperature of the existing incineration facility via weight change. Therefore, the incineration temperature was set between 850 and 1,100℃; however, the incineration temperature of the sample containing a high concentration of PCNs was set at 350, 500, 850, and 1,100℃. At 350 and 500℃, high concentrations of CO and NOx were observed, which could be attributed to incomplete combustion. Furthermore, heat-sensitive PCNs showed a de-chlorination reaction between 200 to 440℃. In addition, the decomposition rate (DRE) slightly increased according to the incineration temperature increase.
2
Thermal-fluid characteristics on near wall of gas-solid fluidized bed reactor

Moon, Hokyu,Choi, Seungyeong,Park, Yong-Ki,Cho, Hyung Hee Pergamon Press 2017 International journal of heat and mass transfer Vol. No.
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Abstract Gas-solid circulating fluidized beds (CFBs) are for carbon capture process because of their remarkable heat and mass transfer characteristics in the target reactor. Bed-to-wall heat transfer is an important issue in designing a reactor to satisfy the required conditions. Bed-to-wall heat transfer is characterized by near-wall particle behavior. Thus, in this study, local bed-to-wall heat transfer and near-wall particle dynamic characteristics were measured in a lab-scale CFB riser. The clustered particle behavior near the wall was investigated primarily using a non-intrusive method, particle-imaging velocimetry (PIV), within the CFB riser. To determine the effects of bed instability on the clustered particle behavior at the wall, bed instability was controlled. Bed instability was estimated by the degree of pressure fluctuation in the riser, and the fluctuation effect was compared, depending on the fluidization regime. Ultimately, the clustered particle behavior on the adjacent wall was compared depending on the pressure fluctuations using the PIV system. We estimated the clustered particle behavior on the adjacent wall of the CFB riser considering fluidization instability. Detailed analysis of the relationship between the bed-to-wall heat transfer and the particle behavior was conducted. Highlights <UL> <LI> Heat transfer is measured to design heat-exchangeable CO2 capture reactor. </LI> <LI> Near-wall thermal-fluid characteristics is distinguished by operating conditions. </LI> <LI> Bed-to-wall heat transfer is enhanced with increasing particle clustering. </LI> </UL>
3
실험실 규모의 분해조에서 소와 돼지 사체의 분해특성 비교

전태완,정용우,정미정,이지영,정성경,유혜영,신선경,오길종 한국폐기물자원순환학회 2014 한국폐기물자원순환학회지 Vol.31 No.3
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In 2010, amidst nationwide foot and mouth disease (FMD) outbreak and avian flu (AI), burial sites were urgently createdfor the disposal of animal carcasses. Some of the burial sites didn't satisfy the carcass burial standard (e.g. too manycarcasses were buried in one site, or size or location were not suitable), causing secondary environmental pollutionincluding collapse of burial sites, contamination of ground water, soil and adjacent streams, and malodor. In this regard,there has been growing demand for measures to reduce the environmental impact of the burial sites and guidelines fordesigning and management of burial sites, considering domestic characteristics, to stabilize them. This study aims toacquire basic data to build pilot burial sites. To this end, we established lab scale reactors to analyze decompositioncharacteristics of buried bovine and swine carcasses and properties of leachate and malodorous substances from them.The results showed that the decomposition of the samples inflated all reactors on its fifth day. But with time, as the volumeof the samples decreased, the solum started to subside. In conclusion, at least 8 weeks was needed for the burial sitesto stabilize. Malodorous substances, unlike other types of gas, were found to have relatively high content of sulfurousgases from 43 to 355 ppb. The four types of detected sulfurous gases were all classified as specific malodorous substances,producing rotting and unpleasant smell, irritating skin, eyes and the respiratory system, and damaging the central nervoussystem. Therefore, it is considered that controling sulfurous gases will play an important role in treating malodoroussubstances from burial sites.