removal of methyl tert-butyl ether (mtbe) from contaminated water by photocatalytic process

نویسندگان

a eslami dept. of environmental health engineering, school of public health and center for environmental rese

s nasseri dept. of environmental health engineering, school of public health and center for environmental rese

b yadollahi dept. of chemistry, university of isfahan, iran

a mesdaghinia dept. of environmental health engineering, school of public health and center for environmental rese

چکیده

background: methyl tert -butyl ether (mtbe) has been commercially used as an octane enhancer to replace tetraethyl lead in gasoline since 1979. the high mobility, water solubility, and resistance to natural attenuation associated with mtbe may re­sult in contamination of ground and surface waters. in this investigation the degradation of aqueous mtbe at relatively high concentrations was studied by uv-vis/tio 2 /o 2 photocatalytic process. the effect of important operational parameters such as ph, oxygen flow, catalyst loading, and irradiation time were also studied. methods: concentration of mtbe and intermediates such as tert-butyl formate (tbf) and tert-butyl alcohol (tba) were meas­ured using a gas chromatograph equipped with flam ionization detector and combined with headspace sampler. results: the time required for complete degradation increased from 15 to 150 min, when the initial concentration was in­creased from 10 to 500 mg/l. the first order rate constant for degradation of mtbe from the hydroxyl radical was esti­mated to be 0.266 to 0.033 min -1 as the concentration increased from 10 to 500 mg/l. study on the overall mineralization moni­tored by total organic carbon (toc) analysis showed that in the initial concentration of 100 mg/l mtbe, complete min­eralization was obtained after 110 min under uv-vis/ tio 2 /o 2 photocatalytic process. conclusion: the data presented in this paper clearly indicate that uv/tio 2 /o 2 advanced oxidation process provides an effi­cient treatment alternative for the remediation of mtbe contaminated water.

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Photocatalytic Degradation of Methyl Tert-Butyl Ether (MTBE) from Aqueous Solution: A Review

 Nowadays, underground water is the main source of drinking water that contamination to organic pollutants such as MTBE is an important issue. One of the suitable methods for these types of pollutants is the advanced oxidation methods. Advanced oxidation processes (AOPs) are involved in the production of highly reactive hydroxyl radicals that oxidize organic matter such as MTBE and even le...

متن کامل

Methyl tert-butyl ether (MTBE) bioremediation studies

The massive production of methyl tert-butyl ether (MTBE), a primary constituent of reformulated gasoline, combined with its mobility, persistence and toxicity, makes it an important pollutant. It was considered recalcitrant until a few years ago, but recently MTBE biodegradation in aerobic conditions has been demonstrated with both mixed and pure cultures. Mixed cultures are generally the more ...

متن کامل

Methyl tert-butyl ether (MTBE) degradation by a microbial consortium.

The widespread use of methyl tert-butyl ether (MTBE) as a gasoline additive has resulted in a large number of cases of groundwater contamination. Bioremediation is often proposed as the most promising alternative after treatment. However, MTBE biodegradation appears to be quite different from the biodegradation of usual gasoline contaminants such as benzene, toluene, ethyl benzene and xylene (B...

متن کامل

Rapid Biodegradation of Methyl tert-Butyl Ether (MTBE) by Pure Bacterial Cultures

Two pure bacterial strains capable of rapid degrading methyl tert–butyl ether (MTBE) were isolated from an industrial wastewater treatment plant, identified and characterized. These strains are able to grow on MTBE as the sole carbon and energy sources and completely mineralize it to the biomass and carbon dioxide. The strains were identified as Bacillus cereus and Klebsiella terrigena. Bot...

متن کامل

Cometabolism of methyl tert-butyl ether (MTBE) with alkanes

The release of methyl tert-butyl ether (MTBE) to the environment, mainly from damaged gasoline underground storage tanks or distribution systems spills, has provoked extended groundwater pollution. Biological treatments are, in general, a good alternative for bioremediation of polluted sites; however, MTBE elimination from environment has constituted a challenge because of its chemical structur...

متن کامل

Removal of methyl tert-butyl ether from water by pervaporation using ceramic-supported polymer membranes

Pervaporation removal of methyl tert-butyl ether (MTBE) from dilute aqueous solutions was demonstrated using ceramic-supported polymer (CSP) membranes. These membranes were created by the free radical graft polymerization of vinyl acetate onto a vinyl trimethoxysilaneactivated porous silica substrate having a native average pore size of 500 Å. The resulting membranes consisted of poly(vinyl ace...

متن کامل

منابع من

با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید


عنوان ژورنال:
iranian journal of public health

جلد ۳۸، شماره ۲، صفحات ۱۸-۲۶

میزبانی شده توسط پلتفرم ابری doprax.com

copyright © 2015-2023