Title page for etd-0805114-172724


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URN etd-0805114-172724
Author Yu-cheng Lin
Author's Email Address kantlin2002@gmail.com
Statistics This thesis had been viewed 5344 times. Download 0 times.
Department Environmental Engineering
Year 2013
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title An odor control simulation test of in-situ 1,2-dichloroethane bioremediation
Date of Defense 2014-07-23
Page Count 127
Keyword
  • microbial analysis
  • bioremediation
  • sulfide control
  • acidification
  • 1,2-dichloromethane
  • Abstract Soil and groundwater at many existing and former industrial areas and disposal sites are contaminated by chlorinated organic solvents, which are commonly found non-aqueous phase liquid (NAPL) compounds, that were released into the environment accidently or intentionally. The 1,2-dichloroethane (1,2-DCA or EDC) has been shown on induces hepatocellular carcinogens in mice and is a human carcinogen. Thus, 1,2-DCA was used as the target compound in this study. One cost-effective approach for the remediation of the chlorinated-solvent contaminated aquifers is the application of in situ anaerobic bioremediation. However, enhanced in situ bioremediation requires the injection of primary substrates, which would cause the acidification and odor problems of the subsurface environment. This would deteriorate the groundwater quality and cause the increase in maintenance cost. Furnace slag is a final waste material in the basic oxygen furnace steel making process. In blast furnace iron making, limestone (as fluxes) is added to react with the gangue minerals (iron ore and coke) to form iron slag. Desulfurization agent is added to remove the sulfur from the steel water, and the slag formed in the furnace, after being solidified, is called desulfurization slag (DS). Because DS has high pH characteristics (12.5), this limits its recycle and reuse. However, the slowly released hydroxide ions from the DS would minimize the acidification of the groundwater and the released metals would precipitate the sulfide to minimize the odor problem. The objective of this proposed study was to evaluate the feasibility of applying DS in situ at the DNAPL site to minimize the impact of low pH and odor problems caused by the bioremediation process. In this study, batch and column experiments were performed to evaluate the effects of DS addition on neutralization of acidified groundwater. Released chemicals from DS were analyzed and evaluated for their effects on sulfide precipitation and odor minimization. Results indicate that DS could increase the pH to 11 within 1 hr after its application. Ferrous sulfide could lower the pH to below 4 after application. This reveals that ferrous sulfide could neutralize the high pH caused by the DS addition. Approximately 94% of sulfide could be removed when DS or ferrous sulfide was added in the system. Addition of long-lasting substrate, DS, or ferrous sulfide could result in different 1,2-DCA removal rate. Increase in dehalococoides (DHC) population was observed after the addition of long-lasting substrate, DS, or ferrous sulfide. Results will be useful in designing a field-scale system to enhance the in situ bioremediation of chlorinated-solvent contaminated groundwater.
    Advisory Committee
  • Kua-chu Yu - chair
  • Li-chu Tsai - co-chair
  • Wen-Liang Lai - co-chair
  • Yu-Tzu Huang - co-chair
  • Chin-Ming Kao - advisor
  • Files
  • etd-0805114-172724.pdf
  • Indicate in-campus at 99 year and off-campus access at 99 year.
    Date of Submission 2014-09-09

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