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24 DEVELOPMENT AND EVALUATION OF Mn OXIDE-COATED COMPOSITE ADSORBENT FOR THE REMOVAL AND RECOVERY OF HEAVY METALS FROM METAL CONTAMINATED WASTEWATER Huan-Jung Fan, Graduate Research Assistant Paul R. Anderson, Associate Professor Pritzker Department of Environmental Engineering Illinois Institute of Technology, Chicago, Illinois 60616 INTRODUCTION With 29% of the world reserves, coal is the most abundant fossil energy resource in the United States. This amount of coal is equivalent to 2 trillion barrels of crude oil; more than twice the world's known oil reserves. According to DOE's National Energy Strategy, the 770 million tons of coal per year used in 1990 will increase 50% by 2010. This number will nearly double by 2030. In 1990, 55% of US electricity was produced by coal.1 Due to the increased use of coal, mobilization of heavy metals contained in coal is a growing concern. Although metals are found in coal in relatively low concentrations, total emissions of metals can be significant because of the extremely large quantities of coal consumed. Traditional techniques to treat metal-contaminated wastewater involve some form of a precipitation process. However, these processes have some potential disadvantages. For example, complexing agents may inhibit the precipitation process, the optimal pH for precipitation varies from one metal to another, and there are problems associated with sludge management. An alternative treatment process is the removal of metals by adsorption onto oxide adsorbents, such as aluminum oxides, iron oxides, and manganese oxides. However, one of the major limitations of the adsorption process is solid separation. Because a typical oxide adsorbent is in a colloidal form, it is difficult to separate from aqueous solution. One solution to this problem is to prepare a granular composite adsorbent that can be used in a column process. Based on this concept, a composite adsorbent prepared from manganese and granular activated carbon (MnGAC) may address some of these problems. The reason for choosing Mn oxides is that relative to Fe or Al oxides, Mn oxides have a higher affinity for many heavy metals.2"4 Furthermore, several investigators have suggested applications for Mn oxides in water and wastewater treatment.4"7 Results from these studies suggest that Mn oxides can be used to synthesize an effective adsorbent for metal removal. GAC, which has a high surface area, should provide an efficient surface for the Mn oxide. At the same time, the Mn oxides can improve the metal adsorption capacity of GAC. The resulting composite adsorbent (MnGAC) has good potential to become a very efficient way to remove metals from metal contaminated wastewater. MATERIALS AND METHODS This study includes two sections, adsorbent preparation and adsorbent characterization. A composite adsorbent (Mn GAC) was prepared by coating Mn-oxide onto granular activated carbon (GAC). The adsorbent was characterized by batch adsorption capacity, batch kinetic, and column tests. Reagent grade chemicals were used throughout this study unless specified, and all labware was acid washed and thoroughly rinsed with double distilled water (DDW). 50th Purdue Industrial Waste Conference Proceedings, 1995. Ann Arbor Press. Inc.. Chelsea. Michigan 48118. Printed in U.S.A. 217
Object Description
Purdue Identification Number | ETRIWC199524 |
Title | Development and evaluation of Mn oxide-coated composite adsorbent for the removal and recovery of heavy metals from metal contaminated wastewater |
Author |
Fan, Huan-Jung Anderson, Paul R. |
Date of Original | 1995 |
Conference Title | Proceedings of the 50th Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://e-archives.lib.purdue.edu/u?/engext,45474 |
Extent of Original | p. 217-226 |
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 |
Format | JP2 |
Date Digitized | 2009-11-24 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page 217 |
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 | 24 DEVELOPMENT AND EVALUATION OF Mn OXIDE-COATED COMPOSITE ADSORBENT FOR THE REMOVAL AND RECOVERY OF HEAVY METALS FROM METAL CONTAMINATED WASTEWATER Huan-Jung Fan, Graduate Research Assistant Paul R. Anderson, Associate Professor Pritzker Department of Environmental Engineering Illinois Institute of Technology, Chicago, Illinois 60616 INTRODUCTION With 29% of the world reserves, coal is the most abundant fossil energy resource in the United States. This amount of coal is equivalent to 2 trillion barrels of crude oil; more than twice the world's known oil reserves. According to DOE's National Energy Strategy, the 770 million tons of coal per year used in 1990 will increase 50% by 2010. This number will nearly double by 2030. In 1990, 55% of US electricity was produced by coal.1 Due to the increased use of coal, mobilization of heavy metals contained in coal is a growing concern. Although metals are found in coal in relatively low concentrations, total emissions of metals can be significant because of the extremely large quantities of coal consumed. Traditional techniques to treat metal-contaminated wastewater involve some form of a precipitation process. However, these processes have some potential disadvantages. For example, complexing agents may inhibit the precipitation process, the optimal pH for precipitation varies from one metal to another, and there are problems associated with sludge management. An alternative treatment process is the removal of metals by adsorption onto oxide adsorbents, such as aluminum oxides, iron oxides, and manganese oxides. However, one of the major limitations of the adsorption process is solid separation. Because a typical oxide adsorbent is in a colloidal form, it is difficult to separate from aqueous solution. One solution to this problem is to prepare a granular composite adsorbent that can be used in a column process. Based on this concept, a composite adsorbent prepared from manganese and granular activated carbon (MnGAC) may address some of these problems. The reason for choosing Mn oxides is that relative to Fe or Al oxides, Mn oxides have a higher affinity for many heavy metals.2"4 Furthermore, several investigators have suggested applications for Mn oxides in water and wastewater treatment.4"7 Results from these studies suggest that Mn oxides can be used to synthesize an effective adsorbent for metal removal. GAC, which has a high surface area, should provide an efficient surface for the Mn oxide. At the same time, the Mn oxides can improve the metal adsorption capacity of GAC. The resulting composite adsorbent (MnGAC) has good potential to become a very efficient way to remove metals from metal contaminated wastewater. MATERIALS AND METHODS This study includes two sections, adsorbent preparation and adsorbent characterization. A composite adsorbent (Mn GAC) was prepared by coating Mn-oxide onto granular activated carbon (GAC). The adsorbent was characterized by batch adsorption capacity, batch kinetic, and column tests. Reagent grade chemicals were used throughout this study unless specified, and all labware was acid washed and thoroughly rinsed with double distilled water (DDW). 50th Purdue Industrial Waste Conference Proceedings, 1995. Ann Arbor Press. Inc.. Chelsea. Michigan 48118. Printed in U.S.A. 217 |
Resolution | 300 ppi |
Color Depth | 8 bit |
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