Study of Bioremediation of Stimulated Groundwater Contaminated by Dichloroethylene with Anaerobic Dechlorination Combined with Aerobic Co-metabolism treatment
| Autor: | Han-Wei Tseng, 曾瀚緯 |
|---|---|
| Rok vydání: | 2013 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 101 Due to incomplete anaerobic biodegradation of PCE, dichloroethylene (DCE) accumulates in saturated groundwater aquifers. A column study was conducted to simulate the degradation of DCE through aerobic co-metabolism using methane as the primary substrate. In addition, a comparison of the DCE degradation efficiency and the microorganism community structure with previous research was conducted. Results of the biostimulation study showed that PCE could be readily degraded in the anaerobic environment after 60 days of column operating, leading to increase in the by-product – DCE formation. DCE could not be effectively degraded in the subsequent aerobic column, with a removal efficiency of 65%. However, when the system was operated at aerobic co-metabolism process, the degradation of DCE improved to 100%. The by-product of DCE – vinyl chloride (VC), could also be degraded simultaneously. Batch experiments showed that various methods of methane addition affects the degradation rate of DCE due to the rate of oxygen consumption. With the addition of hydrogen peroxide, the removal rate of DCE increased significantly with the excess consumption of oxygen and methane by aerobic microorganisms. Also, the kinetics of DCE degradation follows a first-order reaction rate. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
| Externí odkaz: |
|