Biodegradation of Gasoline Additive Methyl Tertiary-Butyl Ether in Water PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Biodegradation of Gasoline Additive Methyl Tertiary-Butyl Ether in Water PDF full book. Access full book title Biodegradation of Gasoline Additive Methyl Tertiary-Butyl Ether in Water by Wenhua Ye. Download full books in PDF and EPUB format.
Author: Wenhua Ye
Publisher:
ISBN:
Category : Volatile organic compounds
Languages : en
Pages : 190
Get Book Here
Book Description
Gasoline additive Methyl Tertiary-Butyl Ether (MTBE) contaminated ground waters have been a problem nation wide with spills and leaky underground storage tanks. Biodegradation has been implemented under certain favorable environmental conditions. The biodegradation rates have been affected by treatments of nutrients, magnesium peroxide (oxygen), ethanol, temperature, pH and MTBE concentrations. This study was conducted to find the indigenous microorganisms which can degrade MTBE and assess how environmental factors would affect the biodegradation rates. This study compared MTBE biodegradation of the indigenous soil microorganisms with that of pure bacteria Methylobacterium mesophilicum, a well known MTBE degrade. In the pure culture Methylobacterium mesophilicum study, magnesium peroxide was found to enhance the MTBE biodegradation rate. However, ethanol was found to inhibit the biodegradation of MTBE, perhaps because it was degraded more easily and its metabolism decreased oxygen availability. In the soil microorganisms study, both magnesium peroxide and ethanol were found to enhance the MTBE biodegradation rates significantly. Co-metabolism between MTBE and ethanol may be possible in soil microorganisms.
Author: Wenhua Ye
Publisher:
ISBN:
Category : Volatile organic compounds
Languages : en
Pages : 190
Get Book Here
Book Description
Gasoline additive Methyl Tertiary-Butyl Ether (MTBE) contaminated ground waters have been a problem nation wide with spills and leaky underground storage tanks. Biodegradation has been implemented under certain favorable environmental conditions. The biodegradation rates have been affected by treatments of nutrients, magnesium peroxide (oxygen), ethanol, temperature, pH and MTBE concentrations. This study was conducted to find the indigenous microorganisms which can degrade MTBE and assess how environmental factors would affect the biodegradation rates. This study compared MTBE biodegradation of the indigenous soil microorganisms with that of pure bacteria Methylobacterium mesophilicum, a well known MTBE degrade. In the pure culture Methylobacterium mesophilicum study, magnesium peroxide was found to enhance the MTBE biodegradation rate. However, ethanol was found to inhibit the biodegradation of MTBE, perhaps because it was degraded more easily and its metabolism decreased oxygen availability. In the soil microorganisms study, both magnesium peroxide and ethanol were found to enhance the MTBE biodegradation rates significantly. Co-metabolism between MTBE and ethanol may be possible in soil microorganisms.
Author: F.. Arendt
Publisher:
ISBN:
Category :
Languages : en
Pages : 1454
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Butyl methyl ether
Languages : en
Pages : 162
Get Book Here
Book Description
Author: Amy Pruden
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
This study investigates the potential for biodegradation of methyl tert-butyl ether (MTBE), a prevalent gasoline additive and groundwater contaminant, under various substrate and oxidation-reduction (redox) conditions. Porous pot reactors designed for biomass retention were operated aerobically under the following conditions: MTBE only, MTBE and ethanol, MTBE and di-isopropyl ether, MTBE and diethyl ether, and MTBE with benzene, toluene, ethylbenzene, and p-xylene (BTEX). In all reactors, optimal performance was achieved when operated without biomass wasting. Mineralization of MTBE and the alternative substrates was observed in all reactors, with an average stable effluent concentration of all compounds being at or below 1 ppb (0.001 mg/l). Anaerobically, MTBE degradation was investigated in porous pot reactors and in batch systems. After a 180 day acclimation period, conversion of MTBE to its intermediate, tert-butyl alcohol (TBA), was observed in both batch and continuous-flow iron-reducing systems, and one instance of degradation was observed in the denitrifying porous pot reactor. No degradation of MTBE under methanogenic or sulfate-reducing conditions was observed after over 1 year of incubation. A molecular tool, denaturing gradient gel electrophoresis (DGGE) was used to monitor and profile the bacterial community structure of all reactors. Members of the Flexibacter-Bacterioides-Cytophaga (F-B-C) group of bacteria were most represented among all aerobic reactors, while delta-Proteobacteria were found to be prevalent in the iron-reducing system. Beta-Proteobacteria with high similarity to the known MTBE degrader, PM1, were detected by DGGE late in operation of the MTBE only and the MTBE and BTEX reactors. Two pure MTBE-degrading cultures with high similarity to PM1 were also isolated from the MTBE only reactor. Studies in pure culture also indicated no significant effect of alternative substrate (BTEX) on MTBE degradation. Results indicate that aerobic degradation of MTBE is reliable under various substrate conditions, and that a porous pot reactor designed for biomass retention is highly effective for attaining low effluent concentrations of MTBE and its intermediates.
Author: United States. Congress. Senate. Committee on Environment and Public Works
Publisher:
ISBN:
Category : Law
Languages : en
Pages : 132
Get Book Here
Book Description
Author: M. Gillner
Publisher:
ISBN:
Category : Medical
Languages : en
Pages : 228
Get Book Here
Book Description
This book evaluates the risks to human health and the environment posed by exposure to methyl tertiary-butyl ether (MTBE). Used almost exclusively as a fuel additive, MTBE is blended with gasoline to provide both octane enhancement and an increase in oxygen content. MTBE currently numbers among the 50 chemicals produced in the highest volume worldwide. Production and use are expected to increase, particularly in countries where oxygenated or reformulated gasolines are required in national programs aimed at reducing ambient air levels of carbon monoxide and ozone or benzene and other volatile hydrocarbons. A summary of sources of human and environmental exposure is followed by an assessment of what is known about the chemical's environmental behavior and fate. Studies demonstrate that, after discharge into air, MTBE largely remains in the air, with smaller amounts entering soil and water. Although atmospheric MTBE can partition into rain, data indicate that atmospheric transformation by hydroxyl radicals is a more important pathway of removal.
Author: Michael J. Moran
Publisher:
ISBN:
Category : Butyl methyl ether
Languages : en
Pages : 40
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Butyl methyl either
Languages : en
Pages : 6
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Butyl methyl ether
Languages : en
Pages : 52
Get Book Here
Book Description
Author: Ali Medella
Publisher:
ISBN:
Category :
Languages : en
Pages : 111
Get Book Here
Book Description
Methyl tert butyl ether is an oxygenate added to gasoline to increase the octane rating and improve gasoline combustion. Assessment of MTBE biodegradation under aerobic conditions is conducted in Lab-scale Biomass Concentrator Reactors (BCRs). The Biomass Concentrator Reactors are miniature scale modified BCRs similar to the one operated at field-scale in Rhode Island. The BCRs were operated under high flow rates, 78.27 l/day and 137.5 l/day of dechlorinated tap Water, containing high concentrations of MTBE and other gasoline additives namely DIPE (di-isopropyl ether), ETBE (ethyl tert butyl ether), TAME (tert amyl methyl ether), TAA (tert amyl alcohol) and gasoline constituents BTEX (Benzene, Toluene, Ethyl Benzene and p-Xylene). The BCRs were effective in the removal of the aforementioned contaminants to concentrations less than 5 ug/l, which is the California drinking water advisory for MTBE. A tracer study was also conducted on the reactors; and a mathematical model that describes the hydraulic flow rates within the reactors was obtained. Finally, the performance of the BCRs was investigated under shock loading and intermittence of feeding (starvation tests) of the contaminants of concern to evaluate the propensity of the reactor recovery. The BCRs were found resilient to fluctuations in substrate conditions.
