Title page for etd-0722116-113151


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URN etd-0722116-113151
Author Chia-nien Huang
Author's Email Address No Public.
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Department Environmental Engineering
Year 2015
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Application of carbon-substrate complex to enhance the anaerobic biodegradation of 1,2-dichloroethane
Date of Defense 2016-07-22
Page Count 107
Keyword
  • 1
  • enhanced bioremediation
  • microbial diversity
  • reductive dechlorination
  • groundwater bioremediation
  • 2-dichloromethane
  • Abstract Chlorinated aliphatic hydrocarbons (CAHs) are frequently found as contaminants
    of soil and groundwater as a result of their widespread use in various industrial
    processes and improper disposal methods. When they are released into the subsurface,
    they tend to adsorb onto the soils and cause the appearance of DNAPL
    (dense-non-aqueous phase liquid) pool. The 1,2-dichloroethane (1,2-DCA or EDC) has
    been shown on induces hepatocellular carcinogens in mice and is a human carcinogen.
    Application of in situ anaerobic bioremediation is a feasible technology to remediate
    DNAPL site. In situ anaerobic bioremediation of chlorinated compounds (e.g.,
    1,2-DCA) requires the injection of primary substrates to enhance the reductive
    dechlorination process of chlorinated compounds. In this study, 1,2-DCA was used as
    the target compound. The main objective was to compare the effectiveness of using
    BS-1 (brand name) (developed for continuous carbon release) and commercially
    available substrate C-Mix (brand name) (a carbon-substrate complex) on 1,2-DCA
    dechlorination under anaerobic conditions. Results from the microcosm study show that
    the pH in microcosms with BS-1 supplement remained in neutral (in the range from 6.5
    to 7) throughout the experiment (93 days of operation). Approximately 99% of
    1,2-DCA could be removed when BS-1 was added in the system. However, in
    microcosms using C-Mix as the primary substrate, significant pH drop was observed.
    Results from the column experiment show that 1,2-DCA can be degraded to below 0.05
    mg/L (with initial concentration of 136 mg/L, flow rate of 0.1 L/day, and detention time
    of 8 days) with the addition of BS-1 as the substrate. Results of the microbial diversity
    analyses for the BS-1 microcosm show that the following bacteria were observed:
    hydrogen-producing bacteria Clostridium sp., uncultured Desulfitobacterium sp. Clone
    E15 bac, sulfate reduction species Sulfate-reducing bacterium LZK1, Desulfovibrio
    psychrotolerans strain JS1, Delta proteobacterium K2-52, and Desulfovibrio sp.
    SKKL8. Results from his study demonstrate that BS-1 can serve as the primary
    substrate to enhance the reductive dechlorination of 1,2-DCA effectively.
    Advisory Committee
  • Lei Yang - chair
  • Hua-Shan Tai - co-chair
  • Tzung-yuh Yeh - co-chair
  • Yi-Chu Huang - co-chair
  • Chil-Ming Kao - advisor
  • Files
  • etd-0722116-113151.pdf
  • Indicate in-campus at 99 year and off-campus access at 99 year.
    Date of Submission 2016-08-22

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