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Effect of oxidant-to-substrate ratios on the degradation of MTBE with Fenton reagent.
Water Res. 2008 Jun; 42(12):3225-39.WR

Abstract

Prior studies have shown the effectiveness of Fenton reagent (FR) for degrading low concentrations (1.0-2.0mg/L) of methyl tert-butyl ether (MTBE), similar to those found in contaminated groundwater. The present study investigates the effect of increasing FR doses on the extent of degradation and mineralization of a given initial MTBE concentration. The FR to MTBE molar ratio (FMMR) was the operating variable, and was investigated at values between 0.5:1 and 200:1. This approach provided sequential snapshots of the MTBE degradation process, which may help to improve the understanding of MTBE degradation with FR. The initial MTBE concentration (MTBE(0)) was approximately 22.7 microM (approximately 2.0mg/L), and FR was used in a 1:1 molar ratio of ferrous iron (Fe(2+)) and hydrogen peroxide (H(2)O(2)). The concentrations of MTBE and the following main reaction byproducts: tert-butyl formate (TBF), tert-butyl alcohol (TBA), acetone and methyl acetate were determined from samples collected at specific intervals over a total reaction time of 1h. Total organic carbon (TOC) was monitored to determine MTBE mineralization, and the total concentration of tert-butyl compounds (tBC) was monitored due to the suspected toxicity associated with this functional group. The results showed that the minimum FMMR necessary for achieving complete MTBE degradation was 20:1, but at that FMMR, TOC and tBC reduction were only 45.6% and 24.9%, respectively. Complete MTBE mineralization was not achieved in any case, even at FMMRs as high as 200:1, where only 63.3% of mineralization was observed (although tBC reduction reached 99.6%, since traces of TBA were still detected). These results confirm the relative inability of FR to achieve complete mineralization of a target substrate, even those that are highly reactive with the hydroxyl radical.

Authors+Show Affiliations

MWH Americas Inc., 618 Michillinda Ave. Suite 200, Arcadia, CA 91007, USA. arturo.burbano@mwhglobal.comNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

18468654

Citation

Burbano, Arturo A., et al. "Effect of Oxidant-to-substrate Ratios On the Degradation of MTBE With Fenton Reagent." Water Research, vol. 42, no. 12, 2008, pp. 3225-39.
Burbano AA, Dionysiou DD, Suidan MT. Effect of oxidant-to-substrate ratios on the degradation of MTBE with Fenton reagent. Water Res. 2008;42(12):3225-39.
Burbano, A. A., Dionysiou, D. D., & Suidan, M. T. (2008). Effect of oxidant-to-substrate ratios on the degradation of MTBE with Fenton reagent. Water Research, 42(12), 3225-39. https://doi.org/10.1016/j.watres.2008.04.004
Burbano AA, Dionysiou DD, Suidan MT. Effect of Oxidant-to-substrate Ratios On the Degradation of MTBE With Fenton Reagent. Water Res. 2008;42(12):3225-39. PubMed PMID: 18468654.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of oxidant-to-substrate ratios on the degradation of MTBE with Fenton reagent. AU - Burbano,Arturo A, AU - Dionysiou,Dionysios D, AU - Suidan,Makram T, Y1 - 2008/04/06/ PY - 2007/11/29/received PY - 2008/03/22/revised PY - 2008/04/01/accepted PY - 2008/5/13/pubmed PY - 2008/11/7/medline PY - 2008/5/13/entrez SP - 3225 EP - 39 JF - Water research JO - Water Res VL - 42 IS - 12 N2 - Prior studies have shown the effectiveness of Fenton reagent (FR) for degrading low concentrations (1.0-2.0mg/L) of methyl tert-butyl ether (MTBE), similar to those found in contaminated groundwater. The present study investigates the effect of increasing FR doses on the extent of degradation and mineralization of a given initial MTBE concentration. The FR to MTBE molar ratio (FMMR) was the operating variable, and was investigated at values between 0.5:1 and 200:1. This approach provided sequential snapshots of the MTBE degradation process, which may help to improve the understanding of MTBE degradation with FR. The initial MTBE concentration (MTBE(0)) was approximately 22.7 microM (approximately 2.0mg/L), and FR was used in a 1:1 molar ratio of ferrous iron (Fe(2+)) and hydrogen peroxide (H(2)O(2)). The concentrations of MTBE and the following main reaction byproducts: tert-butyl formate (TBF), tert-butyl alcohol (TBA), acetone and methyl acetate were determined from samples collected at specific intervals over a total reaction time of 1h. Total organic carbon (TOC) was monitored to determine MTBE mineralization, and the total concentration of tert-butyl compounds (tBC) was monitored due to the suspected toxicity associated with this functional group. The results showed that the minimum FMMR necessary for achieving complete MTBE degradation was 20:1, but at that FMMR, TOC and tBC reduction were only 45.6% and 24.9%, respectively. Complete MTBE mineralization was not achieved in any case, even at FMMRs as high as 200:1, where only 63.3% of mineralization was observed (although tBC reduction reached 99.6%, since traces of TBA were still detected). These results confirm the relative inability of FR to achieve complete mineralization of a target substrate, even those that are highly reactive with the hydroxyl radical. SN - 0043-1354 UR - https://www.unboundmedicine.com/medline/citation/18468654/Effect_of_oxidant_to_substrate_ratios_on_the_degradation_of_MTBE_with_Fenton_reagent_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0043-1354(08)00141-3 DB - PRIME DP - Unbound Medicine ER -