Stability prediction of the xanthate-stabilized Zn(OH)2 and Cu(OH)2 sludge in simulated landfill environment

Teh Sheng Su; Yi Kuo Chang; Juu En Chang; Ming Sheng Ko; Yan Hsuen Chen

Stability prediction of the xanthate-stabilized Zn(OH)₂ and Cu(OH)₂ sludge in simulated landfill environment

Teh Sheng Su, Yi Kuo Chang, Juu En Chang, Ming Sheng Ko, Yan Hsuen Chen

Department of Environmental Engineering

Research output: Contribution to conference › Paper › peer-review

Abstract

In this work, the long-term stability of the xanthate-stabilized Zn(OH)₂ sludge (ZnBX matrices) and Cu(OH)₂ sludge (CuBX matrices) under simulated acidic landfill environment was studied. The semi-dynamic leaching test (SDLT) using 1N acetic acid solution as leachant was performed to simulate the landfill age as one SDLT leaching cycle provided the equivalent acidity of a 5-yr landfill period. The SDLT had been performed 10 weeks totally (i.e., 10 leaching cycles), which gives the simulation of the time period for 50 years of landfill age. The leaching and stabilizing characteristics of the ZnBX and CuBX matrices through the SDLT were characterized using pH meter, ORP meter, A.A., UV-vis, XRD and EA techniques. The result of SDLT after 10 weeks of extractions showed that the leached species were reducing and alkaline materials, and both the metal released rate in ZnBX and CuBX matrices gradually decreased with the increase of extraction time. The cumulative fraction of zinc released was 71.9 %, whereas the copper was 2.6 %. The xanthate treatment was suitable for copper-bearing sludges than zinc-bearing sludges when choosing landfill as final disposal. The rate of containment leaching was controlled by dissolution (diffusion) and surface wash-off. The UV-vis spectra of leaching solutions indicated that the xanthate species were decomposed in the acidic solution. The XRD patterns showed the Cu(BX)₂ and ZnS to be the residual phase of the ZnBX and CuBX matrices after SDLT. The long-term stability of the CuBX matrices might be attributed to the formation of Cu(BX)₂ complexes.

Original language	English
Publication status	Published - 2006 Jan 1
Event	5th International Conference on Environmental Informatics, ISEIS 2006 - Bowling Green, United States Duration: 2006 Aug 1 → 2006 Aug 3

Other

Other	5th International Conference on Environmental Informatics, ISEIS 2006
Country	United States
City	Bowling Green
Period	06-08-01 → 06-08-03

All Science Journal Classification (ASJC) codes

Environmental Engineering
Water Science and Technology
Renewable Energy, Sustainability and the Environment
Management, Monitoring, Policy and Law

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@conference{15d9c47b9b154e20a07b127efa361b7b,

title = "Stability prediction of the xanthate-stabilized Zn(OH)2 and Cu(OH)2 sludge in simulated landfill environment",

abstract = "In this work, the long-term stability of the xanthate-stabilized Zn(OH)2 sludge (ZnBX matrices) and Cu(OH)2 sludge (CuBX matrices) under simulated acidic landfill environment was studied. The semi-dynamic leaching test (SDLT) using 1N acetic acid solution as leachant was performed to simulate the landfill age as one SDLT leaching cycle provided the equivalent acidity of a 5-yr landfill period. The SDLT had been performed 10 weeks totally (i.e., 10 leaching cycles), which gives the simulation of the time period for 50 years of landfill age. The leaching and stabilizing characteristics of the ZnBX and CuBX matrices through the SDLT were characterized using pH meter, ORP meter, A.A., UV-vis, XRD and EA techniques. The result of SDLT after 10 weeks of extractions showed that the leached species were reducing and alkaline materials, and both the metal released rate in ZnBX and CuBX matrices gradually decreased with the increase of extraction time. The cumulative fraction of zinc released was 71.9 %, whereas the copper was 2.6 %. The xanthate treatment was suitable for copper-bearing sludges than zinc-bearing sludges when choosing landfill as final disposal. The rate of containment leaching was controlled by dissolution (diffusion) and surface wash-off. The UV-vis spectra of leaching solutions indicated that the xanthate species were decomposed in the acidic solution. The XRD patterns showed the Cu(BX)2 and ZnS to be the residual phase of the ZnBX and CuBX matrices after SDLT. The long-term stability of the CuBX matrices might be attributed to the formation of Cu(BX)2 complexes.",

author = "Su, {Teh Sheng} and Chang, {Yi Kuo} and Chang, {Juu En} and Ko, {Ming Sheng} and Chen, {Yan Hsuen}",

year = "2006",

month = jan,

day = "1",

language = "English",

note = "5th International Conference on Environmental Informatics, ISEIS 2006 ; Conference date: 01-08-2006 Through 03-08-2006",

}

Stability prediction of the xanthate-stabilized Zn(OH)₂ and Cu(OH)₂ sludge in simulated landfill environment. / Su, Teh Sheng; Chang, Yi Kuo; Chang, Juu En; Ko, Ming Sheng; Chen, Yan Hsuen.

2006. Paper presented at 5th International Conference on Environmental Informatics, ISEIS 2006, Bowling Green, United States.

Research output: Contribution to conference › Paper › peer-review

TY - CONF

T1 - Stability prediction of the xanthate-stabilized Zn(OH)2 and Cu(OH)2 sludge in simulated landfill environment

AU - Su, Teh Sheng

AU - Chang, Yi Kuo

AU - Chang, Juu En

AU - Ko, Ming Sheng

AU - Chen, Yan Hsuen

PY - 2006/1/1

Y1 - 2006/1/1

N2 - In this work, the long-term stability of the xanthate-stabilized Zn(OH)2 sludge (ZnBX matrices) and Cu(OH)2 sludge (CuBX matrices) under simulated acidic landfill environment was studied. The semi-dynamic leaching test (SDLT) using 1N acetic acid solution as leachant was performed to simulate the landfill age as one SDLT leaching cycle provided the equivalent acidity of a 5-yr landfill period. The SDLT had been performed 10 weeks totally (i.e., 10 leaching cycles), which gives the simulation of the time period for 50 years of landfill age. The leaching and stabilizing characteristics of the ZnBX and CuBX matrices through the SDLT were characterized using pH meter, ORP meter, A.A., UV-vis, XRD and EA techniques. The result of SDLT after 10 weeks of extractions showed that the leached species were reducing and alkaline materials, and both the metal released rate in ZnBX and CuBX matrices gradually decreased with the increase of extraction time. The cumulative fraction of zinc released was 71.9 %, whereas the copper was 2.6 %. The xanthate treatment was suitable for copper-bearing sludges than zinc-bearing sludges when choosing landfill as final disposal. The rate of containment leaching was controlled by dissolution (diffusion) and surface wash-off. The UV-vis spectra of leaching solutions indicated that the xanthate species were decomposed in the acidic solution. The XRD patterns showed the Cu(BX)2 and ZnS to be the residual phase of the ZnBX and CuBX matrices after SDLT. The long-term stability of the CuBX matrices might be attributed to the formation of Cu(BX)2 complexes.

AB - In this work, the long-term stability of the xanthate-stabilized Zn(OH)2 sludge (ZnBX matrices) and Cu(OH)2 sludge (CuBX matrices) under simulated acidic landfill environment was studied. The semi-dynamic leaching test (SDLT) using 1N acetic acid solution as leachant was performed to simulate the landfill age as one SDLT leaching cycle provided the equivalent acidity of a 5-yr landfill period. The SDLT had been performed 10 weeks totally (i.e., 10 leaching cycles), which gives the simulation of the time period for 50 years of landfill age. The leaching and stabilizing characteristics of the ZnBX and CuBX matrices through the SDLT were characterized using pH meter, ORP meter, A.A., UV-vis, XRD and EA techniques. The result of SDLT after 10 weeks of extractions showed that the leached species were reducing and alkaline materials, and both the metal released rate in ZnBX and CuBX matrices gradually decreased with the increase of extraction time. The cumulative fraction of zinc released was 71.9 %, whereas the copper was 2.6 %. The xanthate treatment was suitable for copper-bearing sludges than zinc-bearing sludges when choosing landfill as final disposal. The rate of containment leaching was controlled by dissolution (diffusion) and surface wash-off. The UV-vis spectra of leaching solutions indicated that the xanthate species were decomposed in the acidic solution. The XRD patterns showed the Cu(BX)2 and ZnS to be the residual phase of the ZnBX and CuBX matrices after SDLT. The long-term stability of the CuBX matrices might be attributed to the formation of Cu(BX)2 complexes.

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M3 - Paper

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T2 - 5th International Conference on Environmental Informatics, ISEIS 2006

Y2 - 1 August 2006 through 3 August 2006