Study of ethyl t-butyl ether (MTBE) Biodegradation

• Main Authors: Hung-Kuan Shiu, 許宏寬
• Other Authors: Hung-Yuan Fang
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/88093982463454039653

碩士 === 國立雲林科技大學 === 環境與安全工程系碩士班 === 89 === Methyl tert-butyl ether (MTBE) has been used as an mainly oxygenate in reformulated gasoline oxyfuels, are world wide added to gasoline to enhance octane no. and improve combustion efficiency. MTBE is extremely water soluble, moderately volatile and highly mobile compound that cause MTBE contamination of surface water, groundwater, soils and sediments from leaking of oil tank. Because of recalcitrance to biodegrade and slow natural deay, due to perceived threats to the environment and public health. A aerobic mixed bacterial culture that and using tert-butyl alcohol (TBA) as combetabolism and MTBE as sole carbon source, capable of degrading MTBE mixed culture was obtained from Taiwan environment. It shows have two day lag growth and MTBE degradation. Then it slows have a patency growth and degradation. The best growth at 11 days. The optimal MTBE concentration for growth is 100~500 mg/L , the specific growth rate is 0.12 d-1. It will be inhibit when MTBE concentration more than 1000 mg/L. The degradation pH range is 6~8 and optimal is 7. It shows the MTBE concentration from 316 mg/L to 187 mg/L in 20 days and degradation rate is 37%. The petroleum degradation bacterial such as motor oil degradation bacterium Pseudomonas stutzeri（MO-1）,kerosene degradation bacterium Pseudomonas aeruginosa（KS-1）, diesel degradation bacterium Pseudomonas aeruginosa（DS-4）、paraffin degradation bacterium Ochrobactrum anthropi（PF-4）、phonel degradation bacterium Pseudomonas cepacia（PH-2）、benzene degradation bacterium Aeromonas hydrophila (B-1)、toluene degradation bacterium Pasteurella haemolytica（TO-3）、xylene degradation bacterium Pseudomonas vesicularis（XY-2）. It only kerosene degradation bacterium could have 23 % degradation effectively in 14 day. Forbore study we know that we can enforce the microbial MTBE degradate capacity by adaption process.