Title page for etd-0808113-225506


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URN etd-0808113-225506
Author Yi-Li Liang
Author's Email Address No Public.
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Department Environmental Engineering
Year 2012
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Health risk assessment of total petroleum hydrocarbon- contaminated groundwater
Date of Defense 2013-07-23
Page Count 86
Keyword
  • chemicals of concern
  • health risk assessment
  • cancerigenic risk
  • risk management
  • total petroleum hydrocarbon
  • Abstract non-sensory. A survey and severity of the pollution on a contaminated site cannot often be easily identified without carrying out investigations. In the SG pollution investigation, pollutions can often be found in farmlands, factories, gas stations and storage tanks. Gas stations and storage tanks, in particular, are commonly seen contaminated by oil products. The key components found in oils products inclusive of total petroleum hydrocarbon (TPH), petrol additives- methyl tertiary-butyl ether (MTBE), BTEX (benzene, toluene, ethylbenzene, xylenes) and TMB (1,2,4-trimethylbnezene and 1,3,5-trimethylbenzene) pose health risks to human body. There is a certain degree of difficulty to assess the health risks that are exposed to the sites which are contaminated by TPH. The health risk assessment is based on the hypothesis of one single chemical element; therefore, when it is applied to TPH pollutions with multiple carbon compounds, it becomes more complicated. Besides, the analytic and technical threshold has to be overcome to separate the compound, TPH effectively. This study was conducted on one of the TPH contaminated sites in the south of Taiwan where the health risk calculation, evaluation of the pollution concentrations and health risks on the pollution sites was carried out. The result of evaluation revealed that on-site, non-cancerigenic risk value in adult and child receptors was the same, 1.44×10-4; whereas off-site, non-cancerigenic risk value in adult and child receptors fell in the acceptable range. The result disclosed that, under the circumstances of low pollution concentrations (if abiding by laws and regulations), there was no significant difference between adult and child risk value, both of which met the requirement of regulations in risk limiting values. However, the risk value represented profound variations in areas just 50 meters away, from which we learned that when vapors of the contaminated groundwater evaporated into atmosphere, the pollution concentration reduced by means of atmospheric transmission. It then further lowered risks that receptors were exposed to. In addition, pollution concentration of the site in this study met the standards of soil and groundwater pollution control and the result of health risk calculation also conformed to the standards of risk limiting values. This indicated that the toxicity in the TPH-contained pollutants should be in the category of non-acute toxic compounds because the risk value did not exceed the legal limit in the existence of small volume (e.g. in the condition of extremely low pollution concentration).
    Advisory Committee
  • Chiu-Wen Chen - chair
  • Chih-Feng Chen - co-chair
  • Ku-Fan Chen - co-chair
  • Chin-Ming Kao - advisor
  • Files
  • etd-0808113-225506.pdf
  • Indicate in-campus at 99 year and off-campus access at 99 year.
    Date of Submission 2013-09-08

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