fulltext.study @t Gmail

In situ photocatalytic remediation of MTBE-contaminated water: Effects of organics and inorganics

Paper ID Volume ID Publish Year Pages File Format Full-Text
41463 45890 2011 10 PDF Available
Title
In situ photocatalytic remediation of MTBE-contaminated water: Effects of organics and inorganics
Abstract

This investigation is part of a feasibility study which uses photocatalysis as a potential technology for cleaning up contaminated groundwater. It is likely that the presence of other constituents in groundwater may affect the performance of the process. Therefore, this study was conducted to investigate the effect of organic compounds and dissolved ions on the removal efficiency of a contaminant, methyl tert butyl ether (MTBE), using a reactor reported previously, Honeycomb II. Toluene, ethylbenzene and o-xylene (TEo-X), and iron, calcium, nitrate and chloride were used to represent organic and inorganic constituents, respectively, in this study. The MTBE removal efficiency decreased with increasing TEo-X concentration. The low MTBE removal efficiency at iron concentrations of 15 and 30 mg L−1 could be suppressed by the effect of chloride ion via possible mechanisms such as OH radical scavenging and/or blocking of active sites via adsorption onto the catalyst surface in acidic conditions. The MTBE removal efficiency peaked at iron concentrations of 50 mg L−1. When flowing through the reactor in a single pass, the MTBE removal efficiency of Honeycomb II increased with increasing hydraulic residence time (HRT), similar to a previous study but at lower efficiencies. When both TEo-X and dissolved ions were present, the MTBE removal efficiency remained circa 50% after 8 h operation despite the variation of TEo-X and dissolved ion concentrations. Although the catalyst was used for six experiments prior to the double pass flow experiment, about 80% MTBE removal was achieved after two passes in 48 h, in the presence of TEo-X and dissolved ions. This study demonstrated that this photocatalytic reactor can still degrade MTBE in the presence of other constituents without any process optimisation measures and reinforces its potential use for in situ groundwater remediation.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (167 K)Download as PowerPoint slideResearch highlights► MTBE removal varied inversely with the concentration of organics. ► The presence of chloride reduced the MTBE removal efficiency. ► MTBE removal efficiency peaked at an iron concentration of 50 mg L−1. ► Dissolved inorganic ions have greater impact on the MTBE removal than organics. ► At least 80% MTBE was removed in the presence of both organics and dissolved ion.

Keywords
Dissolved ions; Immobilised titanium dioxide (TiO2); In situ groundwater remediation; Organics; Photocatalysis
First Page Preview
In situ photocatalytic remediation of MTBE-contaminated water: Effects of organics and inorganics
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 394, Issues 1–2, 28 February 2011, Pages 52–61
Authors
, ,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us