Main content

The Trail Biochemical Reactor and the Removal of Arsenic with a Focus on the Specific Role of Iron

Show simple item record

dc.contributor.advisor Glasauer, Susan
dc.contributor.author Mattes, Allan
dc.date.accessioned 2013-09-10T15:11:54Z
dc.date.available 2013-09-10T15:11:54Z
dc.date.copyright 2013-08
dc.date.created 2013-08-19
dc.date.issued 2013-09-10
dc.identifier.uri http://hdl.handle.net/10214/7494
dc.description.abstract A bioremediation system was constructed in Trail British Columbia to treat high concentrations of Zn and sulphate through the formation of zinc sulphide (sphalerite). Arsenic concentrations were also high but it was unknown if arsenic would form similar sulphides and be removed. When it was, it was not clear what the mechanisms were. Therefore, a smaller pilot-scale sized system was constructed to specifically examine As removal to and delineate the removal mechanisms. It was noted that the concentration of Fe increased as seepage moved through the cells and it was hypothesized that this increase in Fe concentration could play a role in As removal. Analysis of the results of both the large system and the smaller system failed to fully explain As removal and it was decided to undertake a larger research program at the University of Guelph. Extensive analysis including As adsorption of the three substrate components (sand, limestone and pulp and paper biosolids) were completed. Most probable number bacteria studies of the small system were also completed. These results showed the expected bacteria as well as a previously unknown iron oxidizing bacteria. This IOB was isolated, characterized and identified. A second smaller system was constructed at Fleming College to further examine this bacteria. Anaerobic filtered samples of seepage were collected from horizontal sampling piezometers. These were analyzed by ICP-OES to measure the concentration of Fe and As on the filters. Correlation techniques were used to measure the association of these two elements on each filter. The same system was also used to study the changing internal dynamics of a BCR cell in operation. The final results provided information about the internal working of a BCR cell and showed that Fe was involved in some measure in these operations. Removal of arsenic in the Trail BCR was complex with multiple removal mechanisms. Formation of insoluble kottigite (Zn2(AsO4)3.7 H2O) initially takes place aerobically but it cannot form in the anaerobic regions of the cells. Arsenic can adsorb or co-precipitate on metal sulphides such as ZnS formed in the cells. In the most anaerobic regions orpiment (As2S3) can form. en_US
dc.description.sponsorship Ontario Centres of Excellence, Nature Works en_US
dc.language.iso en en_US
dc.subject Arsenic en_US
dc.subject zinc en_US
dc.subject iron en_US
dc.subject bacteria en_US
dc.subject sulphate reducing bacteria en_US
dc.subject iron reducing bacteria en_US
dc.subject acid producing bacteria en_US
dc.subject iron oxidizing bacteria en_US
dc.subject adsorption en_US
dc.subject orpiment en_US
dc.subject sphalerite en_US
dc.subject kottigite en_US
dc.title The Trail Biochemical Reactor and the Removal of Arsenic with a Focus on the Specific Role of Iron en_US
dc.type Thesis en_US
dc.degree.programme Environmental Sciences en_US
dc.degree.name Doctor of Philosophy en_US
dc.degree.department School of Environmental Sciences en_US
dc.rights.license All items in the Atrium are protected by copyright with all rights reserved unless otherwise indicated.


Files in this item

Files Size Format View Description
Mattes_Allan_201309_Phd.pdf 36.16Mb PDF View/Open Mattes_Allan_201309_Phd.pdf

This item appears in the following Collection(s)

Show simple item record