| Summary: | 碩士 === 長榮大學 === 職業安全與衛生學系碩士班 === 102 === The purpose of this study is to simulate the waste gas concentration after incinerator smokestack emissions through the atmosphere diffusion and distribution situation, estimate emissed dioxin concentration range, and to evaluate possible health risks by the residents of a incineration plant in Tainan area.
Calculation was performed on the emissions of the incineration plant flue concentration from 2011 to 2013. The average dry basis exhaust gas is 1457.29Nm3 / min, the concentration of dioxin emissions is 0.048ng-TEQ / Nm3. The atmospheric dispersion model ISCST3 (Industrial Source Complex Short-Term Dispersion Model) was employed to estimate the distribution of the incinerator dioxin concentrations in ambient air. The input data includes the parameters such as air temperature, wind direction, wind speed, etc. The meteorological data was provided by the Central Weather Bureau. According to the calculated results: the annual average concentration of dioxin in air is 0.659 ng/Nm3 at Chang Jung Christian University; 0.0674 ng/Nm3 at Tainan railway station; 0.0335 ng / Nm3 at Xinhua downtown (CKS Zhongxiao Road).
A sensitivity analysis on meteorological data showed that the average concentration. of dioxin at Chang Jung Christian University will reduce 1.43% by increasing 1% of wind speed.
Based on the results from the of HRA (Health Risk Assessment) model, sucked nearby the average dioxin exposure dose of residents near the incineration plant was 6.35 × 10-7 pg-TEQ/kg/day, it is below 1 ~ 4 pg-TEQ/kg/day, the permissible exposure dose by released dioxin regulated by World Health Organization. The maximum cancer risk of residents nearby incineration plants is 9.91×10-10 pg-TEQ /kg/day, below the regulated value The results of this study can be used as the basis of hazard control on dioxin emission from the incineration plant.
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