Effects of pH, temperature and solids loading on microbial community structure during batch culture on a polymetallic ore
MetadataShow full item record
The bioleaching of an organic-rich polymetallic ore was conducted under conditions intended to probe the boundaries of microbial activity using iron and sulphur oxidising microorganisms and heterotrophs enriched from self-heating pyritic coal. Solution chemistry parameters such as rapidly increased ORP and reduction in pH subsequent to inoculation point to the development of active microbial communities. The ease with which communities adapted to the organic-rich ore and the bioleaching systems indicated that the organic compounds were not present in leachates at toxic levels. Overall, extractions obtained in three series of inoculated tests were at 35 °C: 79–96% Zn, 48–82% Cu, 47–55% Ni and 79–86% Co; at 55 °C: 96–97% Zn, 72–80% Cu, 46–50% Ni and 82–83% Co. T-RFLP provided semi-quantitative estimates of species abundance. The greatest microbial complexity was observed with moderate pH and low solids loading. Microbial complexity was reduced significantly by low pH or increased solids loading. Nevertheless, efficient bioleaching was observed over a relatively wide range of operating conditions. Even under the more extreme conditions, the community profile was dominated by combinations of organisms not typically seen in most commercial operations.
Showing items related by title, author, creator and subject.
Jahnert, Ricardo; Collins, Lindsay (2013)Microbial deposits at Shark Bay constitute a diverse living microbial carbonate system, developed in a semi-arid, highly evaporative marine setting. Three tidal flats located in different embayments within the World ...
Continental-scale variation in seaweed host-associated bacterial communities is a function of host condition, not geographyMarzinelli, E.; Campbell, A.; Zozaya Valdes, E.; Vergés, A.; Nielsen, S.; Wernberg, T.; de Bettignies, T.; Bennett, Scott; Caporaso, J.; Thomas, T.; Steinberg, P. (2015)© 2015 Society for Applied Microbiology and John Wiley & Sons Ltd.Interactions between hosts and associated microbial communities can fundamentally shape the development and ecology of 'holobionts', from humans to marine ...
Modelling the co-occurence of Streptococcus pneumoniae with other bacterial and viral pathogens in the upper respiratory tractJacoby, P.; Watson, K.; Bowman, J.; Taylor, A.; Riley, T.; Smith, D.; Lehmann, Deborah (2007)Go to ScienceDirect® Home Skip Main Navigation Links Brought to you by: The University of Western Australia Library Login: + Register Athens/Institution Login Not Registered? - User Name: Password: ...