Remediation And By-products Of MTBE In
Groundwater By A Photochemical Process
Author(s)
S. Mohebali, S. Tasharrofi & R. Kaveh Ahangar
Abstract
MTBE has been used as an octane number enhancer in gasoline, and blended
with gasoline to about 15% by volume. High concentrations of MTBE have been
discovered in the groundwater at a number of petrol stations in Iran. MTBE
exhibits very high mobility in groundwater. Due to its solubility, groundwater
contaminated with MTBE poses many problems for remediation. The properties
of MTBE, including water solubility, vapour pressure, soil adsorption
coefficient, retardation factor and Henry’s law constant affect the selection and
design of remediation technologies. Although MTBE is difficult to treat
economically with conventional techniques, it readily degraded
photocatalytically. The degradation of MTBE at high concentration (10,000 µg/l)
was investigated in batch nanocrystalline TiO2 slurries. The optimum loading of
TiO2 was found experimentally. In this experiment MTBE degradation
proceeded with a pseudo first order reaction. The primary by-products have been
identified. Mass balance calculation has shown that MTBE is completely
mineralised. A reaction pathway is proposed.
Keywords: photocatalysis, advanced oxidation process, nanocrystalline titanium
dioxide, hydroxyl radical, tert-butyl format, tert-butyl alcohol, MTBE.
1 Introduction
MTBE has been widely used as an octane enhancer in gasoline in Iran since
2000. The gasoline has been stored in aboveground and underground storage
tanks at refineries and service stations, and has been transferred via pipeline,
barge, rail and truck. As a result of leaks and splits, MTBE has been detected in
groundwater supplies more than 2 µg/l [1]. The physical properties of MTBE
Keywords
photocatalysis, advanced oxidation process, nanocrystalline titanium
dioxide, hydroxyl radical, tert-butyl format, tert-butyl alcohol, MTBE.
Related Book
Other papers in this volume
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