EFFECTS OF GASOLINE AND BTEX COMPOUNDS ON METHANOGENIC BACTERIA
Gasoline is able to pollute the environment through leaks in underground storage tanks and spills at refineries, tank farms, terminals and commercial filling stations. BTEX compounds (Benzene, Toluene, Ethylbenzene, and Xylene) are common components of gasoline, and are used as raw materials in the production of pesticides, plastics, and synthetic fibers. With the potential for these toxics to enter and disrupt anaerobic treatment plant operations, it is important that their effect on methanogenic bacteria be evaluated. The objective of this research was to assess the effects of gasoline and BTEX compounds at high concentration levels on methanogenic bacteria. Another objective was to assess the effects of the BTEX combinations as they compare to gasoline. The following toxicant combinations were studied: Unleaded gasoline (100%); BTEX (25% of each); Ethylbenzene/Xylene (50% each), Benzene/Xylene (50% each). This experiment showed that there was negligible difference between toxicant exposure at 2000 mg/L and 4000 mg/L for a given toxicant. The results also showed that the different BTEX combinations had essentially the same effect on the methanogens regardless of the concentration. In acclimation studies, it was observed that there was negligible acclimation to the toxicants. The gas production recovery period was much slower and not as consistent between the various toxicant combinations as in the first exposure. The toxic effect of gasoline was less than that of the BTEX combinations. This experiment revealed that methanogens could withstand an initial high concentration toxic slug dose of BTEX and gasoline, and recover their normal gas production. However, the second toxic exposure indicated that there might be latent physiological damage to the methanogens from high toxic exposure that was not readily apparent from the first exposure data.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
Document Type: Research Article
Publication date: 2003-01-01
More about this publication?
- Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed. A subscription to the Proceedings of the Water Environment Federation includes access to most papers presented at the annual WEF Technical Exhibition and Conference (WEFTEC) and other conferences held since 2000. Subscription access begins 12 months after the event and is valid for 12 months from month of purchase. A subscription to the Proceedings of the Water Environment Federation is included in Water Environment Federation (WEF) membership.
WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access. Access begins 12 months after the conference or event
- Subscribe to this Title
- Membership Information
- About WEF Proceedings
- WEFTEC Conference Information
- Learn about the many other WEF member benefits and join today
- Ingenta Connect is not responsible for the content or availability of external websites