The adsorption of TCE in soils and cometabolism biodegradation

• Main Authors: Meng-Chi Chou, 周孟琦
• Other Authors: Ming-Muh Kao
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/92121902932784418071

碩士 === 國立成功大學 === 環境工程學系碩博士班 === 90 === The main objective of this study is to understand the adsorption capacity of trichloroethylene(TCE) and toluene by the different organic matter content soils. The biodegradation of toluene and TCE by toluene degrading bacterium T1 strain and indigenous microorganisms in the slurry environment were also evaluated. For the adsorption experiments, the results show that the Meishan soil with high organic matter content has better adsorption capacity of TCE and toluene. When achieve the adsorptive equilibrium, the ranges of adsorption percentage for TCE(10~30mg/L) and toluene(5~35mg/L) are 16~23% and 11~34%, respectively. Besides, the poor linear regression of Freundlich adsorption isotherm shows that the adsorption capacity of TCE and toluene by Tainan and Meishan soil are very poor. For the TCE cometabolism slurry experiments, seeding toluene degrading bacterium significantly increased the efficiency of toluene cometabolic TCE and the removal efficiency of TCE. When toluene and TCE concentration at 700μg/g-soil and 25μg/g-soil, the efficiency of toluene cometabolic TCE for seeding and nonseeding toluene degrading bacterium T1 strain are 0.036 and 0.018μg-TCE/μg-toluene, respectively. The residual amount of TCE are 0% and 49%, respectively. In addition, when duplex addition 350μg/g-soil of toluene, the efficiency of toluene cometabolic TCE(25μg/g-soil) for seeding toluene degrading bacterium T1 strain can be promoted to 0.071μg-TCE/μg-toluene, TCE and toluene can be completely degraded. Therefore, for the economic and efficient point of view, the duplex addition low concentration toluene is a particle method.