Degradación de compuestos oxigenados y alquilfenólicos bajo condiciones anaerobias
Puig-Grajales Laura (1999) Degradation of gasoline oxygenates and alkylphenolic compounds under anaerobic conditions. MCs thesis. Universidad Autbnoma Metropolitana Iztapalapa. Mexico City. The industrialization process has resulted in the formation of products that remain in the environment. Among...
| Autor: | |
|---|---|
| Tipo de recurso: | tesis de maestría |
| Estado: | Versión publicada |
| Fecha de publicación: | 1999 |
| País: | México |
| Institución: | Universidad Autónoma Metropolitana |
| Repositorio: | Repositorio Institucional de la UAM Iztapalapa |
| Idioma: | español |
| OAI Identifier: | oai:bindani.izt.uam.mx:mk61rh48m |
| Acceso en línea: | https://doi.org/10.24275/uami.mk61rh48m |
| Access Level: | acceso abierto |
| Palabra clave: | info:eu-repo/classification/LEM/Aguas residuales -- Purificación -- Tratamiento anaerobio info:eu-repo/classification/LEM/Biodegradation info:eu-repo/classification/LEM/Biodegradación info:eu-repo/classification/LEM/Sewage -- Purification -- Anaerobic treatment info:eu-repo/classification/cti/6 |
| Sumario: | Puig-Grajales Laura (1999) Degradation of gasoline oxygenates and alkylphenolic compounds under anaerobic conditions. MCs thesis. Universidad Autbnoma Metropolitana Iztapalapa. Mexico City. The industrialization process has resulted in the formation of products that remain in the environment. Among the polluting industries are the petrochemical and chemical. The wastewater that comes from this kind of plants is a mixture of inorganic and organic compounds like the aromatic hydrocarbons, (BTEX), PAH and allcylphenols. The alkylphenols are in water streams coming from processes like spend caustic, which is used to wash the oil distillates and phenolic condensates. The most of the efforts have been directed to the elimination of differentoxic compounds from the wastewater streams aiming to protect the surface water. But the groundwater is also important because it is a resource that is vulnerable to a many contaminants. Recently the presence of gasoline oxygenates has been observed in rainwater, lakes, and drinking water supplies together with BTEX compounds. Being volatile compounds and very soluble in water, they get quickly disperse meaning hazard health. information on the anaerobic degradation of gasoline oxygenates and alkylphenolic compounds is scarce. To gain more insight on the biodegradability of these compounds, 2-creso1, 2,6-dimethylphenol (2,6-xylenol), 2-ethylphenol, methyl tert-butyl ether (MTBE), ethyl tert-butyl ether (ETBE), tert-amylethyl ether (TAME), and tert-butyl alcohol (TBA) were chosen as model compounds, in presence of different electron acceptors, as the only carbon and energy source at subtoxic concentrations. The batch biodegradability study was conducted under methanogenesis, sulfate-, nitrate-, Mn (N)-, Fe @I)-reduction and also with the model humic compound anthraquinone 2,6-disulfonate (AQDS). Granular sludge and anaerobic Rhine sediment were used as inoculum. No biodegradation of the gasoline oxygenates was observed after more than 80 days of incubation exposed to different electron acceptors. These results suggest thathe biodegradation of these ethers is not easy and the product formed TBA, also persists under anaerobic conditions. The reason why these compounds are persistent could be related to their branched molecular structure with a tertiary carbon, provide them a high chemical stability. There was not evidence of toxicity for the anaerobic bacteria at the concentration tested. The alkylphenols were not biodegradable after 100 days of incubation under the traditional anaerobic conditions. However, the biodegradation of 2-cresol and 2-ethylphenol was observed in presence of Mn (N) as electron acceptor. The biodegradation of these two compounds took place in less than 15 days. More than 90% of biodegradation was observed for both compounds and W metabolites were not detected after 23 days of incubation under Mn (N)-reductive conditions. 2,6- dimethylphenol was consumed abiotically by chemical reaction with the Mn (NMxide present in the system. |
|---|