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A proposed photocatalytic reactor design for in situ groundwater applications

Paper ID Volume ID Publish Year Pages File Format Full-Text
42197 45914 2010 9 PDF Available
Title
A proposed photocatalytic reactor design for in situ groundwater applications
Abstract

Groundwater remediation is a challenging task as many existing technologies do not clean up contaminated groundwater in situ. Photocatalysis can decompose a wide range of organic compounds and in principle could be applied to in situ groundwater remediation. However, photocatalytic reactor designs are typically small in scale and generally focus on process intensification to maximise its efficiency, particularly for high flows in wastewater treatment. These compact reactor designs may not be technically and economically viable for in situ groundwater remediation. This paper aims to propose a reactor design suitable for in situ groundwater remediation and characterise it with respect to the surface area to volume ratio, aeration, flow and reliability. The surface area study showed that arranging additional immobilised catalyst radially around the UVA lamp can also enhance the reactor efficiency. The reactor efficiency remained consistent throughout 5 successive experiments with continuous aeration. Aeration is an essential component of photocatalytic oxidation and it has an immediate impact on the photocatalytic degradation. The study demonstrated that under the conditions tested, there was a critical hydraulic residence time (HRT) of 1 day (corresponding to an average water velocity of 0.21 m d−1) beyond which the reactor efficiency can be maintained. This paper shows the potential of this reactor configuration for in situ groundwater remediation.

Graphical abstractA parameter study showed that the reactor efficiency is significantly reduced when the hydraulic residence time (HRT) is less than 1 day. This corresponds to an average water velocity of 20 cm d−1 for the reactor studied. As groundwater velocities are typically slower than this, it indicates the potential of this reactor design for in situ groundwater remediation.Figure optionsDownload full-size imageDownload high-quality image (14 K)Download as PowerPoint slide

Keywords
Aeration; Groundwater clean up; Honeycomb reactor; Single pass flow; Reliability; Scale up; Surface area to volume ratio
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A proposed photocatalytic reactor design for in situ groundwater applications
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 378, Issue 2, 30 April 2010, Pages 202–210
Authors
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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