Development of an accelerated leaching method for incineration bottom ash correlated to toxicity characteristic leaching protocol

Heavy metals and some metalloids are the most significant inorganic contaminants specified in toxicity characteristic leaching procedure (TCLP) in determining the safety of landfills or further utilization. As a consequence, a great deal of efforts had been made on the development of miniaturized an...

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Main Authors: Lin, Shengxuan, Zhou, Xuedong, Ge, Liya, Ng, Sum Huan, Zhou, Xiaodong, Chang, Victor Wei-Chung
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2016
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Online Access:https://hdl.handle.net/10356/80748
http://hdl.handle.net/10220/40738
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-807482020-09-26T21:58:23Z Development of an accelerated leaching method for incineration bottom ash correlated to toxicity characteristic leaching protocol Lin, Shengxuan Zhou, Xuedong Ge, Liya Ng, Sum Huan Zhou, Xiaodong Chang, Victor Wei-Chung School of Civil and Environmental Engineering A*STAR SIMTech Nanyang Environment and Water Research Institute Accelerated leaching method Heavy metal Incineration bottom ash Metalloid Toxicity characteristic leaching protocol Heavy metals and some metalloids are the most significant inorganic contaminants specified in toxicity characteristic leaching procedure (TCLP) in determining the safety of landfills or further utilization. As a consequence, a great deal of efforts had been made on the development of miniaturized analytical devices, such as Microchip Electrophoresis (ME) and μTAS for on-site testing of heavy metals and metalloids to prevent spreading of those pollutants or decrease the reutilization period of waste materials such as incineration bottom ash. However, the bottleneck lied in the long and tedious conventional TCLP that requires 18 h of leaching. Without accelerating the TCLP process, the on-site testing of the waste material leachates was impossible. In this study, therefore, a new accelerated leaching method (ALM) combining ultrasonic assisted leaching with tumbling was developed to reduce the total leaching time from 18 h to 30 min. After leaching, the concentrations of heavy metals and metalloids were determined with ICP-MS or ICP-optical emission spectroscopy. No statistical significance between ALM and TCLP was observed for most heavy metals (i.e., cobalt, manganese, mercury, molybdenum, nickel, silver, strontium, and tin) and metalloids (i.e., arsenic and selenium). For the heavy metals with statistical significance, correlation factors derived between ALM and TCLP were 0.56, 0.20, 0.037, and 0.019 for barium, cadmium, chromium, and lead, respectively. Combined with appropriate analytical techniques (e.g., ME), the ALM can be applied to rapidly prepare the incineration bottom ash samples as well as other environmental samples for on-site determination of heavy metals and metalloids. Accepted version 2016-06-22T05:02:44Z 2019-12-06T13:58:05Z 2016-06-22T05:02:44Z 2019-12-06T13:58:05Z 2016 2016 Journal Article Lin, S., Zhou, X., Ge, L., Ng, S. H., Zhou, X., & Chang, V. W.-C. (2016). Development of an accelerated leaching method for incineration bottom ash correlated to toxicity characteristic leaching protocol. Electrophoresis, in press. 0173-0835 https://hdl.handle.net/10356/80748 http://hdl.handle.net/10220/40738 10.1002/elps.201600129 192108 en Electrophoresis © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This is the author created version of a work that has been peer reviewed and accepted for publication by Electrophoresis, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1002/elps.201600129]. application/pdf
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic Accelerated leaching method
Heavy metal
Incineration bottom ash
Metalloid
Toxicity characteristic leaching protocol
spellingShingle Accelerated leaching method
Heavy metal
Incineration bottom ash
Metalloid
Toxicity characteristic leaching protocol
Lin, Shengxuan
Zhou, Xuedong
Ge, Liya
Ng, Sum Huan
Zhou, Xiaodong
Chang, Victor Wei-Chung
Development of an accelerated leaching method for incineration bottom ash correlated to toxicity characteristic leaching protocol
description Heavy metals and some metalloids are the most significant inorganic contaminants specified in toxicity characteristic leaching procedure (TCLP) in determining the safety of landfills or further utilization. As a consequence, a great deal of efforts had been made on the development of miniaturized analytical devices, such as Microchip Electrophoresis (ME) and μTAS for on-site testing of heavy metals and metalloids to prevent spreading of those pollutants or decrease the reutilization period of waste materials such as incineration bottom ash. However, the bottleneck lied in the long and tedious conventional TCLP that requires 18 h of leaching. Without accelerating the TCLP process, the on-site testing of the waste material leachates was impossible. In this study, therefore, a new accelerated leaching method (ALM) combining ultrasonic assisted leaching with tumbling was developed to reduce the total leaching time from 18 h to 30 min. After leaching, the concentrations of heavy metals and metalloids were determined with ICP-MS or ICP-optical emission spectroscopy. No statistical significance between ALM and TCLP was observed for most heavy metals (i.e., cobalt, manganese, mercury, molybdenum, nickel, silver, strontium, and tin) and metalloids (i.e., arsenic and selenium). For the heavy metals with statistical significance, correlation factors derived between ALM and TCLP were 0.56, 0.20, 0.037, and 0.019 for barium, cadmium, chromium, and lead, respectively. Combined with appropriate analytical techniques (e.g., ME), the ALM can be applied to rapidly prepare the incineration bottom ash samples as well as other environmental samples for on-site determination of heavy metals and metalloids.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Lin, Shengxuan
Zhou, Xuedong
Ge, Liya
Ng, Sum Huan
Zhou, Xiaodong
Chang, Victor Wei-Chung
format Article
author Lin, Shengxuan
Zhou, Xuedong
Ge, Liya
Ng, Sum Huan
Zhou, Xiaodong
Chang, Victor Wei-Chung
author_sort Lin, Shengxuan
title Development of an accelerated leaching method for incineration bottom ash correlated to toxicity characteristic leaching protocol
title_short Development of an accelerated leaching method for incineration bottom ash correlated to toxicity characteristic leaching protocol
title_full Development of an accelerated leaching method for incineration bottom ash correlated to toxicity characteristic leaching protocol
title_fullStr Development of an accelerated leaching method for incineration bottom ash correlated to toxicity characteristic leaching protocol
title_full_unstemmed Development of an accelerated leaching method for incineration bottom ash correlated to toxicity characteristic leaching protocol
title_sort development of an accelerated leaching method for incineration bottom ash correlated to toxicity characteristic leaching protocol
publishDate 2016
url https://hdl.handle.net/10356/80748
http://hdl.handle.net/10220/40738
_version_ 1681056567110139904