Acidogenic mine tailings the use of biofilm bacteria to exclude oxygen View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1992-03

AUTHORS

S. A. Blenkinsopp, D. C. Herman, R. G. L. Mccready, J. W. Costerton

ABSTRACT

The data obtained in these preliminary experiments clearly demonstrate that a bacteria and nutrient top-dressing is capable of generating anaerobiosis and of increasing pH. These changes appear to correspond to the depths at which increases in the bacterial population are noted. This suggests that the bacterial population had utilized the available oxygen, and had promoted anaerobic conditions and reduced acid production by plugging the available pore spaces through cell growth and exopolymer production. This interpretation is strongly supported by the reduction in permeability noted after top-dressing with bacteria and nutrient. As indicated by the cell counts and pH data, the bacteria and nutrient top-dressing prevented the development of acidogenic conditions throughout the 30-cm unoxidized Denison tailings column. This strategy was less successful in the oxidized Denison tailings, although an abundant bacterial population and large increases in pH were generated in the upper 6 cm in two experiments. It is of interest that the pH and bacterial population increase noted in oxidized tailings top-dressed with nutrient only was very similar to tailings top-dressed with both bacteria and nutrient. It may therefore be possible, in a field situation, to treat tailings with nutrient alone to enhance the indigenous population. However, before this strategy can be entertained, further testing is obviously required to determine if the rate of permeability reduction is equivalent for both treatments. A bacteria and nutrient top-dressing may possibly provide a greater initial rate of permeability reduction than a nutrient top-dressing alone, which must first stimulate the indigenous population. Our data suggest that it may be expedient to top-dress unoxidized tailings before oxidation can occur. More... »

PAGES

801-809

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf02920598

DOI

http://dx.doi.org/10.1007/bf02920598

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1027427689


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