Culwick Togamana, BSc, MSc (USP), PhD (Exeter)
Lecturer in Chemistry
Location: 010 - 233 (FSTE Building, Room N233)
Tel: (679) 32 32477
Fax: (679)32 31512
Current Research Interests
The presence of toxic elements such as arsenic, cadmium and lead in mine wastes present an unique challenge to their management and disposal methods, particularly at a time when legislation affecting waste management practices are becoming increasingly stringent, all over the world, owing to a greater public awareness of the environment. The rapid depletion of high grade mineral reserves through centuries of mining is imminent and as such there is an urgent need to develop new cost effective technology which would place an emphasis on the sorting, recycling and reclamation of mine wastes. Micro-organisms are known to have played a key role in the solubilisation, transport, and deposition of metals and minerals. Sulfides will react under appropriate conditions to produce sulfuric acid and dissolved species, responsible for acid mine drainage. Both chemical and biological oxidation mechanisms exist but under optimal conditions of pH and temperature, the bacteria-assisted reaction rates are several order of magnitude greater than the chemical rates. If a microbial leaching process can be developed to include the treatment of sulfide tailings, then the potential for the release of toxic substances is lowered and the local environment protected. The metals extracted from tailings material may provide an additional source of revenue and therefore represent a source of future raw-materials.
Published and Unpublished Papers and Reports
A study of Solomon Islands Medicinal plant, Ficus nodosa, 1990
Adsorption of copper, chromium and arsenic by acidic soils from the Pacific Region, 1990
R.J. Morrison, P. Gangaiya, S. Kubuabola, C. Togamana, and Limalevu, L., 1992. Nutrient transport via rivers to the marine environment in Fiji and other South Pacific Islands. In H. Windom and J. Jiang (Editors) River input of nutrients to the marine environment in the Western Pacific. IOC Workshop Report No. 79, UNESCO, Paris, pp 64-79
Nutrient transport via sedimentary processes in the Rewa catchment, MSc thesis, USP 1995
Enhanced microbial extraction of base metals from tailings prior to disposal, Transfer report from MPhil to PhD, Camborne School of Mines, University of Exeter, 1996
C. Togamana, M. A. Jordan, and N. Powell, 1998. Predicting the release of metals from mineral tailings. Paper submitted to the APCOM '98, 27th International Symposium on Computer Applications in the Mineral Industries, Imperial College, London, UK. 19-23 April 1998
C. Togamana, M.A. Jordan, C.V. Phillips and S. McGinness, 1998. Enhanced release of Fe from mine wastes receiving acid pulse. Proceeding of Tailings and Mine Waste'98. Colorado State University. Fort Collins. Colorado. 26-28 January, 1998
C. Togamana. 1998. Evaluation of stability of metalliferrous tailings by chemical and microbiological leaching. PhD Thesis, University of Exeter, UK.
C. Togamana. 1998. Environmental effects of cyanide in mining. Workshop on "Best Practice Environmental Management in the Fijian Mineral Industry. Forum Secretariat, Suva. Fiji. May 11-14, 1998
C. Togamana, 1998. Identification of unknown hazardous wastes. SPREP / CSSP / USP Workshop on "Chemical Safety and Disposal" for Senior Secondary School Teachers. Marine Studies Centre, USP. 24-26 August.