Coupling in situ phase-inversion emulsification with biodegradation for the effective remediation of sediments contaminated by polychlorinated biphenyls and hexachlorobenzene.

• Main Authors: Chia-Wei Yeh, 葉家瑋
• Other Authors: 張書奇
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/9hp4u2

碩士 === 國立中興大學 === 環境工程學系所 === 106 === Sediment contamination in Taiwan is a critical environmental problem. The sediments in Er-Ren River (ERR) in the southern Taiwan is severely contaminated by hydrophobic organic compounds (HOCs), such as polychlorinated biphenyls (PCBs), polycyclic aromatic hydrocarbons (PAHs), polybrominated diphenylethers (PBDEs), hexachlorobenzene, and phthalates. Among them, in the past two decades, PCBs have been detected at high levels. and HCB were detected most frequently. Due to their high Kow and low biodegradability, these HOCs easily accumulated in the surface sediment and accesable to benthic organisms. Thus, they were readily bioconcentrated and biomagnified through trophic levels. Consequently, through trophic relationship, these PCBs could affect ecosystem well-beings and human health. This research is aimed to couple in situ phase-inversion emulsification (ISPIE) and biodegradation for effective remediation of sediments contaminated by Aroclor 1254 and hexachlorobenzene (HCB). This study has shown that single phase-inverse emulsification operation can remove 62% of weathered Aroclor 1254 and 31% of weathered HCB. The the following biodegradation generally is decreasing. For weathered HCB and Aroclor1254, the overall removal could reach higher than 98% in 70 days. The results of PCR-DGGE and sequencing show that the microbial communities are quite different from our expectation. However, the microbial communities (e.g. thermophilic bacteria) in the sediment can effectively degrade Aroclor 1254 and HCB. These results strongly support that this new technology has high feasibility to be implemented in full-scale field remediation.