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34 AN ADVANCED OXIDATION PROCESS USING HYDROGEN PEROXIDE AND HETEROGENEOUS CATALYSTS M. Brett Borup, Assistant Professor Brigham Young University Department of Civil Engineering Provo, Utah 84602 Craig T. Ashcroft, Project Engineer John Carollo Engineers Salt Lake City, Utah 84115 INTRODUCTION The need to develop treatment methods for refractory organic compounds has led to a growing interest in advanced oxidation processes. Advanced oxidation processes have been defined as those processes which generate hydroxyl radicals in sufficient quantity to affect water treatment. Hydroxyl radicals are highly reactive, non-selective, and exhibit consistently high reaction rates with a broad range of organic compounds, including many compounds which are otherwise refractory. Several advanced oxidation processes have previously been studied which take advantage of these characteristics, including; Fenton's reagent,' the combination of hydrogen peroxide and ultraviolet light,2 ozone and UV light,1 and hydrogen peroxide and ozone.4 Each of these processes have been found to successfully oxidize refractory organic compounds which are not oxidized by conventional oxidants or microorganisms. The purpose of this paper is to present the results of tests that were conducted to evaluate the effectiveness of using hydrogen peroxide in the presence of a heterogeneous catalyst for refractory organic oxidation. In this advanced oxidation process hydroxyl radicals are generated as hydrogen peroxide is decomposed upon contact with the catalyst. Two types of catalysts were used in these tests, granular activated carbon (GAC) and ion exchange resin loaded with iron. This type of process would not require the large energy inputs of UV based processes, nor would it require the continuous addition of a second chemical reagent. METHODS AND MATERIALS Several different tests were conducted to investigate Ihe properties of this new process. First, a series of batch tests were conducted to determine the ability of seven different types of granular activated carbon to decompose hydrogen peroxide. One gram of carbon was added to one liter of a solution of hydrogen peroxide and research grade deionized water. Samples were withdrawn from rapidly mixed beakers with time and the hydrogen peroxide concentrations were determined immediately using the titanium(IV) chloride method. The seven carbons tested are described in Table 1. The ash content, the specific surface area, and the quantity of several elements present in each carbon was Table I. Properties of GAC Used Surface Area, Carbon Manufacturer Source Material m2/g Filtrasorb 300 Calgon Bituminous Coal 950-1050 PCB Calgon Coconut Shell 1150-1250 CO 401 Westates Carbon Bituminous Coal 900-1150 KP401 Westates carbon Bituminous Coal 950-1075 Granular Darco American Norit Lignite 625 Darco CG American Norit Lignite 625 Nuchar WV-B Westvaco Bituminous Coal 1422 47th Purdue Industrial Waste Conference Proceedings, 1992 Lewis Publishers, Inc., Chelsea, Michigan 48118. Printed in U.S.A. 301
Object Description
Purdue Identification Number | ETRIWC199234 |
Title | Advanced oxidation process using hydrogen peroxide and heterogeneous catalysts |
Author |
Borup, M. Brett Ashcroft, Craig T. |
Date of Original | 1992 |
Conference Title | Proceedings of the 47th Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://e-archives.lib.purdue.edu/u?/engext,43678 |
Extent of Original | p. 301-308 |
Collection Title | Engineering Technical Reports Collection, Purdue University |
Repository | Purdue University Libraries |
Rights Statement | Digital object copyright Purdue University. All rights reserved. |
Language | eng |
Type (DCMI) | text |
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Date Digitized | 2009-12-10 |
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Color Depth | 8 bit |
Description
Title | page 301 |
Collection Title | Engineering Technical Reports Collection, Purdue University |
Repository | Purdue University Libraries |
Rights Statement | Digital copyright Purdue University. All rights reserved. |
Language | eng |
Type (DCMI) | text |
Format | JP2 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Transcript | 34 AN ADVANCED OXIDATION PROCESS USING HYDROGEN PEROXIDE AND HETEROGENEOUS CATALYSTS M. Brett Borup, Assistant Professor Brigham Young University Department of Civil Engineering Provo, Utah 84602 Craig T. Ashcroft, Project Engineer John Carollo Engineers Salt Lake City, Utah 84115 INTRODUCTION The need to develop treatment methods for refractory organic compounds has led to a growing interest in advanced oxidation processes. Advanced oxidation processes have been defined as those processes which generate hydroxyl radicals in sufficient quantity to affect water treatment. Hydroxyl radicals are highly reactive, non-selective, and exhibit consistently high reaction rates with a broad range of organic compounds, including many compounds which are otherwise refractory. Several advanced oxidation processes have previously been studied which take advantage of these characteristics, including; Fenton's reagent,' the combination of hydrogen peroxide and ultraviolet light,2 ozone and UV light,1 and hydrogen peroxide and ozone.4 Each of these processes have been found to successfully oxidize refractory organic compounds which are not oxidized by conventional oxidants or microorganisms. The purpose of this paper is to present the results of tests that were conducted to evaluate the effectiveness of using hydrogen peroxide in the presence of a heterogeneous catalyst for refractory organic oxidation. In this advanced oxidation process hydroxyl radicals are generated as hydrogen peroxide is decomposed upon contact with the catalyst. Two types of catalysts were used in these tests, granular activated carbon (GAC) and ion exchange resin loaded with iron. This type of process would not require the large energy inputs of UV based processes, nor would it require the continuous addition of a second chemical reagent. METHODS AND MATERIALS Several different tests were conducted to investigate Ihe properties of this new process. First, a series of batch tests were conducted to determine the ability of seven different types of granular activated carbon to decompose hydrogen peroxide. One gram of carbon was added to one liter of a solution of hydrogen peroxide and research grade deionized water. Samples were withdrawn from rapidly mixed beakers with time and the hydrogen peroxide concentrations were determined immediately using the titanium(IV) chloride method. The seven carbons tested are described in Table 1. The ash content, the specific surface area, and the quantity of several elements present in each carbon was Table I. Properties of GAC Used Surface Area, Carbon Manufacturer Source Material m2/g Filtrasorb 300 Calgon Bituminous Coal 950-1050 PCB Calgon Coconut Shell 1150-1250 CO 401 Westates Carbon Bituminous Coal 900-1150 KP401 Westates carbon Bituminous Coal 950-1075 Granular Darco American Norit Lignite 625 Darco CG American Norit Lignite 625 Nuchar WV-B Westvaco Bituminous Coal 1422 47th Purdue Industrial Waste Conference Proceedings, 1992 Lewis Publishers, Inc., Chelsea, Michigan 48118. Printed in U.S.A. 301 |
Resolution | 300 ppi |
Color Depth | 8 bit |
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