Methanol Suppression of Trichloroethylene Degradation byMethylosinus trichosporium (OB3b) and Methane-Oxidizing Mixed Cultures |
| |
Authors: | Eng William Palumbo Anthony V Sriharan Shobha Strandberg G W |
| |
Institution: | 1.Department of Microbiology, University of Tennessee, 37996, Knoxville, TN ;2.Environmental Sciences Division, Oak Ridge National Laboratory, 37831-6036, Oak Ridge, TN ;3.Selma University, 36701, Selma, AL ;4.Chemical Technology Division, Oak Ridge National Laboratory, 37831-6227, Oak Ridge, TN ; |
| |
Abstract: | The effect of methanol on trichloroethylene (TCE) degradation by mixed and pure methylotrophic cultures was examined in batch
culture experiments. Methanol was found to relieve growth inhibition ofMethylosinus trichosporium (OB3b) at high (14 mg/L) TCE concentrations. Degradation of TCE was determined by both radiolabeling and gas chromatography
techniques. When cultures were grown on methanol over 10 to 14 d with 0.3 mg/L TCE, OB3b degraded 16.89 ±0.82% (mean± SD)
of the TCE, and a mixed culture (DT type II) degraded 4.55±0.11%. Mixed culture (JS type I) degraded 4.34±0.06% of the TCE.
When grown on methane with 0.3 mg/L TCE, 32.93±2.01% of the TCE was degraded by OB3b, whereas the JS culture degraded 24.3
±1.38% of the TCE, and the DT culture degraded 34.3 ±2.97% of the TCE. The addition of methanol to cultures grown on methane
reduced TCE degradation to 16.21 ±1.17% for OB3b and to 5.08±0.56% for JS. Although methanol reduces the toxicity of TCE to
the cultures, biodegradation of TCE cannot be sustained in methanol-grown cultures. Since high TCE concentrations appear to
inhibit methane uptake and growth, we suggest the primary toxicity of TCE is directed towards the methane monooxygenase. |
| |
Keywords: | Index Entries" target="_blank">Index Entries Biodegradation trichloroethylene methanotroph methanol methane |
本文献已被 SpringerLink 等数据库收录! |
|