رسالة جامعية
Emulsion-enabled direct recovery and biodegradation of benzo(a)pyrene and PBDEs in river sediment
| العنوان: | Emulsion-enabled direct recovery and biodegradation of benzo(a)pyrene and PBDEs in river sediment |
|---|---|
| العنوان البديل: | 以乳化液進行底泥中苯(a)駢芘與多溴二苯醚回收與生物降解研究 |
| المؤلفون: | Yun-Sung Lo, 羅雲松 |
| مرشدي الرسالة: | Shu-Chi Chang, 張書奇 |
| سنة النشر: | 2014 |
| المجموعة: | National Digital Library of Theses and Dissertations in Taiwan |
| الوصف: | 102 River sediment pollution is worsened in recent year in Taiwan. Contaminations include heavy metals, polychlorinated biphenyls (PCBs), polybrominated diphenyl ethers (PBDEs), and polycyclic aromatic hydrocarbons (PAHs). Up to now, no effective sediment remediation technology is available due to the special hydrogeological conditions in Taiwan. In this study, we propose to directly recover PBDEs and PAHs from contaminated river sediment using a soy-bean oil emulsion and let the residual soy-bean oil play the role of electron donor for biological reductive debromination. This study includes in-lab batch tests and a field pilot-study to prove the feasibility to remediate sediment of Er-Ren Rvier heavily contaminated by PBDEs and PAHs in Tainan, Taiwan. The composition of this emulsion is food-grade surfactant, soybean oil, and water. Due to high logKow values of PBDEs, it should be feasible to directly recover them from sediments and enhance microbial biodegradation of them by using residual soybean oil as electron donors. In this study, three PBDEs, BDE-47, BDE-99 and BDE-209, were employed as modeled PBDE contaminants, and benzo(a)pyrene (BaP) as a representative PAH contaminant. From this study, the best recovery conditions are defined as follows. Hihg oil content emulsion is better than other emulsions. For deemulsification of the sediment mixture, after a stirring mixing with emulsion and left without disturbance, then mixing with carbonate solution as demulsification agent and a subsequent 30-minute sparging with nitrogen gas were performed. For the pilot study, five experimental combinations were tested, i.e., natural recovery, anaerobic biodegradation, aerobic biodegradation sequential anaerobic-aerobic biodegradation, and field control. The results showed that the direct recovery of BDE47 and BDE99 is within the range of 46%-92% and that of BDE 209 is 10-61%. This direct recovery method also works to BaP with about 50% removal. Emulsion amendment did improve the reductive dechlorination of PBDEs and the degradation of BaP. However, BDE-209 is still the hardest to be biodegraded. |
| Original Identifier: | 102NCHU5087104 |
| نوع الوثيقة: | 學位論文 ; thesis |
| وصف الملف: | 139 |
| الإتاحة: | http://ndltd.ncl.edu.tw/handle/01467037554501344541Test |
| رقم الانضمام: | edsndl.TW.102NCHU5087104 |
| قاعدة البيانات: | Networked Digital Library of Theses & Dissertations |
| الوصف غير متاح. |