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British Columbia Mine Reclamation Symposium
A performance comparison of arsenic, cadmium and zinc treatment in a duplicate column study of an anaerobic bioreactor operated at 4 degrees C and 25 degrees C Kawaja, Jonathan D. E.; Gould, W. Douglas; Morin, Lucie; Mattes, Al; Duncan, William F. A. (William Frederick Alexander)
Abstract
This study provides a performance comparison of arsenic, cadmium and zinc treatment at mildly acid to neutral pH in an anaerobic bioreactor (ABR) column experiment operated at 4°C and 25°C. The materials and contaminants were based on a field scale system operated by Nature Works Remediation Corp. for Teck Cominco Metals Ltd. in Trail, BC. The majority of arsenic was removed within the oxic zones of the ABR columns. Although it was thought that arsenic removal at this stage was attributed to sorption to iron, it is now known to be zinc arsenate. The work showed cadmium and zinc removal improved in relation to the extent of anoxic conditions in the columns. In the most anaerobic zone of the columns (i.e., characterized by good sulphate reducing bacteria (SRB) activity) effective zinc removal required a stable SRB population, but was not necessarily temperature dependent. However, there was a direct and significant impact to microbial activity as a result of a temperature change. The work suggested that internal monitoring of DO and SRB can provide valuable information with respect to significant metal removal mechanisms, and the active volume in which metal sulphides can be significantly generated. The information can be used to: troubleshoot an under-performing system, and make appropriate amendments to improve system performance.
Item Metadata
Title |
A performance comparison of arsenic, cadmium and zinc treatment in a duplicate column study of an anaerobic bioreactor operated at 4 degrees C and 25 degrees C
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Creator | |
Contributor | |
Date Issued |
2006
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Description |
This study provides a performance comparison of arsenic, cadmium and zinc treatment at mildly
acid to neutral pH in an anaerobic bioreactor (ABR) column experiment operated at 4°C and
25°C. The materials and contaminants were based on a field scale system operated by Nature
Works Remediation Corp. for Teck Cominco Metals Ltd. in Trail, BC. The majority of arsenic
was removed within the oxic zones of the ABR columns. Although it was thought that arsenic
removal at this stage was attributed to sorption to iron, it is now known to be zinc arsenate. The
work showed cadmium and zinc removal improved in relation to the extent of anoxic conditions
in the columns. In the most anaerobic zone of the columns (i.e., characterized by good sulphate
reducing bacteria (SRB) activity) effective zinc removal required a stable SRB population, but
was not necessarily temperature dependent. However, there was a direct and significant impact to
microbial activity as a result of a temperature change. The work suggested that internal
monitoring of DO and SRB can provide valuable information with respect to significant metal
removal mechanisms, and the active volume in which metal sulphides can be significantly
generated. The information can be used to: troubleshoot an under-performing system, and make
appropriate amendments to improve system performance.
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Extent |
158422 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-05-28
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Provider |
Vancouver : University of British Columbia Library
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Rights |
Attribution-NonCommercial-NoDerivatives 4.0 International
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DOI |
10.14288/1.0042493
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URI | |
Affiliation | |
Peer Review Status |
Unreviewed
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Scholarly Level |
Other
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Copyright Holder |
British Columbia Technical and Research Committee on Reclamation
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Rights URI | |
Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International