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You searched for +publisher:"NSYSU" +contributor:("Lin-Chi Wang"). Showing records 1 – 2 of 2 total matches.

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1. Huang, Chun-Jen. Atmospheric dry/wet deposition of polychlorinated dibenzo-p-dioxins/dibenzofurans in a rural area of Southern Taiwan.

Degree: PhD, Environmental Engineering, 2012, NSYSU

The characteristics of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) and the variation of the gas-particle partitioning of PCDD/Fs near two municipal solid waste incinerators (MSWIs) located in southern Taiwan were investigated. In order to better understand the mechanism of dry deposition, the atmospheric dry deposition flux and velocity of PCDD/Fs were calculated. It was found that the mean atmospheric PCDD/F concentrations (0.0348-0.106 pg I-TEQ/Nm3) were comparable to those detected in the vicinity of MSWIs in Taiwan, but significantly lower than those in a highly industrialized urban area (0.150 pg I-TEQ/Nm3) located in southern Taiwan. The relatively higher atmospheric PCDD/F concentrations was found in winter than in summer. The calculated total dry deposition flux of PCDD/Fs ranged from 0.0274-0.718 ng I-TEQ/m2-month, and the atmospheric deposition flux in winter tended to be higher than those in summer. The results also indicated that dry deposition velocities of atmospheric particles for each month ranged from 0.52-0.91 cm/s (mean = 0.63 cm/s) and 0.48-0.73 cm/s (mean = 0.55 cm/s) in sites A and B, respectively, which were similar to that for the ambient air near two MSWIs in Taiwan, but slightly higher than those in urban area of Korea. In addition, the dry deposition of PCDD/Fs was mainly contributed by particle-phase at both sampling areas during the estimated period. The above results demonstrated that the dominant mechanism of dry deposition was particle phase deposition. The annual variations of wet deposition of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in atmosphere were also measured at two sites (A and B). Results showed that particle scavenging dominates in the wet deposition processes for the removal of PCDD/Fs from the atmosphere, the highest value was observed at the highest chlorinated congener. The ambient temperature and the amount of precipitation played an important role in the variation of PCDD/F deposition fluxes. It was found that temperature was inversely associated with the existence of particulate PCDD/Fs, indicating PCDD/Fs are scavenged most efficiently in cold weather. PCDD/F wet deposition fluxes in rainy seasons (from June to August) were significantly higher than those in dry seasons (from December to February), revealing a positive relationship between wet deposition flux and monthly rainfall. Additionally, the annual total (dry + wet) deposition fluxes of PCDD/Fs were 149 ng/m2-year (5.02 ng I-TEQ/m2-year) and 177 ng/m2-year (5.11 ng I-TEQ/m2-year) for sites A and B, respectively, revealing that dry deposition was more dominant than the wet deposition for the atmospheric deposition of PCDD/Fs. Since atmospheric deposition is believed to be the main transfer pathway of PCDD/Fs into food chains, its impact on human exposure to PCDD/Fs is of great importance. Advisors/Committee Members: Lin-Chi Wang (chair), Kang-Shin Chen (committee member), Wen-Jhy Lee (chair), Shui-Jen Chen (chair), Gou-Ping Chang-Chien (chair).

Subjects/Keywords: Scavenging ratio; Gas-Particle partitioning; Velocity; Polychlorinated dibenzo-p-dioxins/ dibenzofurans (PCDD/Fs); Dry/ Wet deposition

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Huang, C. (2012). Atmospheric dry/wet deposition of polychlorinated dibenzo-p-dioxins/dibenzofurans in a rural area of Southern Taiwan. (Doctoral Dissertation). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0118112-173235

Chicago Manual of Style (16th Edition):

Huang, Chun-Jen. “Atmospheric dry/wet deposition of polychlorinated dibenzo-p-dioxins/dibenzofurans in a rural area of Southern Taiwan.” 2012. Doctoral Dissertation, NSYSU. Accessed October 17, 2019. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0118112-173235.

MLA Handbook (7th Edition):

Huang, Chun-Jen. “Atmospheric dry/wet deposition of polychlorinated dibenzo-p-dioxins/dibenzofurans in a rural area of Southern Taiwan.” 2012. Web. 17 Oct 2019.

Vancouver:

Huang C. Atmospheric dry/wet deposition of polychlorinated dibenzo-p-dioxins/dibenzofurans in a rural area of Southern Taiwan. [Internet] [Doctoral dissertation]. NSYSU; 2012. [cited 2019 Oct 17]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0118112-173235.

Council of Science Editors:

Huang C. Atmospheric dry/wet deposition of polychlorinated dibenzo-p-dioxins/dibenzofurans in a rural area of Southern Taiwan. [Doctoral Dissertation]. NSYSU; 2012. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0118112-173235


NSYSU

2. Chen, Mei-Hsia. Source Identification and Fugitive Emission Quantification of VOCs in Petrochemical Complexes by Using Open-Path Fourier Transform Infrared Spectrometry.

Degree: PhD, Environmental Engineering, 2015, NSYSU

The petrochemical complex examined in this work includes a great variety of facilities and factories that emit various odorants. Fugitive emissions are one of the largest sources of volatile organic compounds (VOCs) from petrochemical and chemical plants. However, how to identiufy and quantify the total fugitive VOC emissions from numerous and mostly inaccessible sources is a time consuming and costly task. A stationary open-path Fourier transform infrared (OPFTIR) system can be used for routine VOC and odor monitoring. However, when odor episodes occur, only multiple mobile OPFTIR systems are able to identify the odorant sources effectively and efficiently. In this study, N,N-dimethyl formamide (DMF) was found to be the most commonly detected odorant emitted from the investigated petrochemical complex by routine monitoring of a stationary OPFTIR system. Then the sequential deployments of a pair of mobile OPFTIR systems were carried out both upwind and downwind of the different sections of the focal area. The pollution rose plots derived from the data obtained by the pair of mobile OPFTIR systems identified the DMF sources. By conducting correlation analyses on the data obtained from the mobile OPFTIR situated at the downwind location of the DMF emission sources, we found that besides DMF, the dry PU synthetic leather process of plant B was also the major odorant source of 2-butanone, ethyl acetate and isopropanol. The source identification measure developed in this study can be used to clarify possible odorant sources not only for petrochemical industrial complexes but also for other areas associated with various emission sources. This study also presents a feasible approach to quantify the fugitive VOC emissions by integrating OPFTIR measurements and the well-developed Industrial Source Complex Short Term Model (ISCST3). A mobile OPFTIR system was set up for 190 hours in the downwind location of a 1,3-butadiene manufacturing process, which has unidentified fugitive sources and should be responsible for the elevated atmospheric 1,3-butadiene concentrations. Wind speeds and directions were found to be the most important factors in the dispersion of the emissions. Therefore, when using trial and error to predict the fugitive 1,3-butadiene emission rates, we divided the field measurement data based on the wind directions and excluded that obtained during lower wind speeds. Then the correlation coefficients between the field data (from the mobile OPFTIR system) and the modeling data (from the ISCST3) were found to be up to 0.529, and the slope of the correlation equation was close to unity. Therefore, integrating the OPFTIR measurement and ISCST3 is a feasible approach to predict the amount of fugitive VOC emissions. Advisors/Committee Members: Lin-Chi Wang (chair), Chung-Hsuang Hung (chair), Chung-Shin Yuan (committee member), Wen-Jhy Lee (chair), Shui-Jen Chen (chair).

Subjects/Keywords: Fugitive emissions; OPFTIR; ISCST3; VOCs; Source identification

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Chen, M. (2015). Source Identification and Fugitive Emission Quantification of VOCs in Petrochemical Complexes by Using Open-Path Fourier Transform Infrared Spectrometry. (Doctoral Dissertation). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0719115-152642

Chicago Manual of Style (16th Edition):

Chen, Mei-Hsia. “Source Identification and Fugitive Emission Quantification of VOCs in Petrochemical Complexes by Using Open-Path Fourier Transform Infrared Spectrometry.” 2015. Doctoral Dissertation, NSYSU. Accessed October 17, 2019. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0719115-152642.

MLA Handbook (7th Edition):

Chen, Mei-Hsia. “Source Identification and Fugitive Emission Quantification of VOCs in Petrochemical Complexes by Using Open-Path Fourier Transform Infrared Spectrometry.” 2015. Web. 17 Oct 2019.

Vancouver:

Chen M. Source Identification and Fugitive Emission Quantification of VOCs in Petrochemical Complexes by Using Open-Path Fourier Transform Infrared Spectrometry. [Internet] [Doctoral dissertation]. NSYSU; 2015. [cited 2019 Oct 17]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0719115-152642.

Council of Science Editors:

Chen M. Source Identification and Fugitive Emission Quantification of VOCs in Petrochemical Complexes by Using Open-Path Fourier Transform Infrared Spectrometry. [Doctoral Dissertation]. NSYSU; 2015. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0719115-152642

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