Effect of air bubbling on atrazine adsorption in water by powdered activated carbons : competitive adsorption of impurities

The effect of air bubbling on trace organic (atrazine) removal from water by powdered activated carbon (PAC) adsorption was investigated by injecting air bubbles at different flow rates into the solution as a mixing method in batch kinetic tests. The factors introduced by the use of air bubbling,...

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Main Authors: Wang, Rong, Krantz, William B., Jia, Yue, Fane, Anthony Gordon
Other Authors: Nanyang Environment and Water Research Institute
Format: Article
Language:English
Published: 2013
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Online Access:https://hdl.handle.net/10356/100155
http://hdl.handle.net/10220/11015
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1001552020-03-07T12:48:43Z Effect of air bubbling on atrazine adsorption in water by powdered activated carbons : competitive adsorption of impurities Wang, Rong Krantz, William B. Jia, Yue Fane, Anthony Gordon Nanyang Environment and Water Research Institute DRNTU::Engineering::Environmental engineering::Water treatment The effect of air bubbling on trace organic (atrazine) removal from water by powdered activated carbon (PAC) adsorption was investigated by injecting air bubbles at different flow rates into the solution as a mixing method in batch kinetic tests. The factors introduced by the use of air bubbling, such as pH increase, N2 and O2 competitive adsorption, mixing efficiency and contaminant release from PVC tubing were examined to identify their contributions to the change of atrazine adsorption efficiency caused by the air bubbling. The experiments revealed that the adsorption process could benefit from higher air bubbling rates. However, under some conditions, the uptake of atrazine was partially reversed after an initial rapid uptake. Several factors that could contribute to this undesirable effect have been examined. The evidence points to the detrimental effect of trace contaminants introduced by the plastic tubing delivering the air. All other factors examined had small to negligible impact. The leaked contaminants presented increasingly in the solution with operating time and competed with atrazine solutes for the active sites in the carbon particles and even displaced adsorbed atrazine over the 6-h kinetic test. As a result, atrazine adsorption efficiency was reduced. In contrast, when stainless steel tubing was used for air injection, no reversal phenomenon was observed in the bubbling batch kinetic adsorption tests. These observations may be important for hybrid adsorption-membrane processes which could use bubbling to provide mixing and fouling control. The common practice of using plastic piping for air delivery may need to be reconsidered especially for trace pollutants removal. 2013-07-08T06:45:44Z 2019-12-06T20:17:34Z 2013-07-08T06:45:44Z 2019-12-06T20:17:34Z 2005 2005 Journal Article Jia, Y., Wang, R., Fane, A. G., & Krantz, W. B. (2005). Effect of air bubbling on atrazine adsorption in water by powdered activated carbons – competitive adsorption of impurities. Separation and Purification Technology, 46(1-2), 79-87. 1383-5866 https://hdl.handle.net/10356/100155 http://hdl.handle.net/10220/11015 10.1016/j.seppur.2005.04.018 en Separation and purification technology © 2005 Elsevier B.V.
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic DRNTU::Engineering::Environmental engineering::Water treatment
spellingShingle DRNTU::Engineering::Environmental engineering::Water treatment
Wang, Rong
Krantz, William B.
Jia, Yue
Fane, Anthony Gordon
Effect of air bubbling on atrazine adsorption in water by powdered activated carbons : competitive adsorption of impurities
description The effect of air bubbling on trace organic (atrazine) removal from water by powdered activated carbon (PAC) adsorption was investigated by injecting air bubbles at different flow rates into the solution as a mixing method in batch kinetic tests. The factors introduced by the use of air bubbling, such as pH increase, N2 and O2 competitive adsorption, mixing efficiency and contaminant release from PVC tubing were examined to identify their contributions to the change of atrazine adsorption efficiency caused by the air bubbling. The experiments revealed that the adsorption process could benefit from higher air bubbling rates. However, under some conditions, the uptake of atrazine was partially reversed after an initial rapid uptake. Several factors that could contribute to this undesirable effect have been examined. The evidence points to the detrimental effect of trace contaminants introduced by the plastic tubing delivering the air. All other factors examined had small to negligible impact. The leaked contaminants presented increasingly in the solution with operating time and competed with atrazine solutes for the active sites in the carbon particles and even displaced adsorbed atrazine over the 6-h kinetic test. As a result, atrazine adsorption efficiency was reduced. In contrast, when stainless steel tubing was used for air injection, no reversal phenomenon was observed in the bubbling batch kinetic adsorption tests. These observations may be important for hybrid adsorption-membrane processes which could use bubbling to provide mixing and fouling control. The common practice of using plastic piping for air delivery may need to be reconsidered especially for trace pollutants removal.
author2 Nanyang Environment and Water Research Institute
author_facet Nanyang Environment and Water Research Institute
Wang, Rong
Krantz, William B.
Jia, Yue
Fane, Anthony Gordon
format Article
author Wang, Rong
Krantz, William B.
Jia, Yue
Fane, Anthony Gordon
author_sort Wang, Rong
title Effect of air bubbling on atrazine adsorption in water by powdered activated carbons : competitive adsorption of impurities
title_short Effect of air bubbling on atrazine adsorption in water by powdered activated carbons : competitive adsorption of impurities
title_full Effect of air bubbling on atrazine adsorption in water by powdered activated carbons : competitive adsorption of impurities
title_fullStr Effect of air bubbling on atrazine adsorption in water by powdered activated carbons : competitive adsorption of impurities
title_full_unstemmed Effect of air bubbling on atrazine adsorption in water by powdered activated carbons : competitive adsorption of impurities
title_sort effect of air bubbling on atrazine adsorption in water by powdered activated carbons : competitive adsorption of impurities
publishDate 2013
url https://hdl.handle.net/10356/100155
http://hdl.handle.net/10220/11015
_version_ 1681048586240917504