Effect of Different Nitrogen Source on the Biodegradation of Diesel in Biopile Process
| Autor: | Chih-Yuan Yang, 楊智元 |
|---|---|
| Rok vydání: | 2017 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 105 A respirometer was employed to study the effect of different nitrogen source on the biodegradation of diesel in the aqueous solution. Followed by respirometry test, this search focused on the biodegradation of diesel at concentration of 20000 mg/kg-soil in soils with the addition of different nitrogen source using a biopile process. The results of respirometry test indicated that using NH4Cl as nitrogen source could effectively enhance the removal of diesel in the water, and using organic nitrogen as nitrogen source had better oxygen consumption and oxygen uptake rate. In the respirometry test, oxygen consumption was followed by MSG, NH4Cl, urea, KNO3, and sludge supernatants. Oxygen uptake rate was followed by NH4Cl, MSG, urea, KNO3, and sludge supernatants. The result of the biopile batch tests indicated that biostimulation with the addition of nitrogen source could enhance the removal efficiency of diesel in the clay silt soil. Addition different nitrogen source could enhance the removal efficiency of diesel. In the biopile process, the diesel removal efficiency were in the range of 77% ~ 92%. Because urea was in the molecular form, it was not easy to be adsorbed by clay and organic matter in the soil. Accordingly, with the addition of urea as nitrogen source, diesel could be biodegraded more effectively in comparison with other nitrogen nutrient. Organic nitrogen had better diesel removal efficiency in the biopile process. However, the diesel removal efficiency of using MSG as nitrogen was not good enough. In the other hand, at the 100:10 carbon-nitrogen ratio, using NH4Cl or KNO3 as nitrogen source was excessive in the clay silt soil. Excessive nitrogen source could inhibit the activity of microorganism. Adding nitrogen source again raise the salt concentration in the soil to inhibit the activity of microorganism. The removal efficiency of the addition of nitrogen source again in the middle of the biopile batch test was worst. It was possibly because nitrogen source in the soil was enough. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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