Dissertation > Excellent graduate degree dissertation topics show

Accumulation of Cesium by Microorganisms and Role of Microorganisms in the Formation of Cesium-Bearing Geyserite in Geothermal Areas, Tibet

Author: WangHaiLei
Tutor: ZhengMianPing;KongFanJing
School: Chinese Academy of Geological Sciences
Course: Mineral prospecting and exploration
Keywords: Qinghai-Tibet Plateau cesium-bearing geyserite deposit microorganism biosorption cesium mineralization model
CLC: P611
Type: PhD thesis
Year: 2006
Downloads: 171
Quote: 1
Read: Download Dissertation

Abstract


A new type of hydrothermal cesium ore—cesium-bearing geyserite was found in Tibet in the late 1980s and the early 1990s. Large-scale mineralization is now still ongoing, and cesium-bearing geyserite is being formed continuously in cesium-bearing geyserite area. Microorganisms grow in large quantities in these areas. We studied the adsorption and absorption of cesium, and influence on the Si-Fe system by microorganisms. In addition, we collected water and geyserite samples from these areas, performed related geochemical analysis and detailed microexamination.Study shows that bacteria and algae dominate in the areas with Calothrix sp., Oscillatoria sp. and Denticula elegans as the dominant species of the algae. These species of microorganisms have a regular population distribution pattern in the area: bacteria and diatoms are the dominant species in spring water; microbial mats dominate at the bottom of a spring, with Calothrix sp. and Oscillatoria sp. as the dominant species; bacteria dominate in bed mud and geyserite, but archean and algae are also developed.Abundant fossil organisms are found in geyserite, high affinity to jelly opal grains in spatial distribution. The fossil organisms were verified to be culturable, and the cultured living bodies resemble the dominant species in the area, indicating that they are the same or similar species.The geyserite shows distinct algal laminated structure. Geochemical and electron microprobe analysis indicats that the cesium content in algae lamination is higher than that in opal lamination.All the dominant species, i.e. Thermus sp. TibetanG6, Calothrix sp., Oscillatoria sp. and Denticula elegans, in the area, show the ability to accumulate cesium from solution. The microbial mats beneath water contain cesium. The solution containing the strain TibetanG6 can efficiently enhance the effect of leaching of cesium from cesium-bearing geyserite. In addition, these dominant species can promote silica precipitation in water. All the above evidences show the biological origin of the cesium-bearing geyserite. At last we present a composite mineralization model of cesium-bearing geyserite from a biological view.

Related Dissertations

  1. Study on Microorganism Contamination Control and Decontamination of Chilled Carved Pork,R446.5
  2. Study on Bacterial and Fungi Community Diversity of Different Particle Size in Paddy Soils under Long-Term Fertilization Treatments in the Tai Lake Region, China,S154.3
  3. The Study on Dynamic Changes of Soil Nutients, Enzymes Activities and Microorganism in Rhizosphere of Tobacco,S572
  4. Preparition and Biological Control Effect of Microbial Organical Fertilizer Against Cotton Verticillium Wilt,S435.621
  5. Isolation & Characterization of 3-Phenoxybenzoic Acid-Degrading Strain BA3 (Sphingobium Sp.) and Construction of Genetically Engineered Microorganism,X172
  6. Ecological Function of Cassava-Peanut Intercropping in Small Red Soil Watershed,S533
  7. Method of Stored Grain Pest Control in Rural Areas,S379
  8. Trametes sp.SQ01 and Chaetomium sp.R01 mixed culture studies on decolorization,X791
  9. Hydroxyapatite fixed contamination of soil heavy metals applied research,X53
  10. White rot fungi on PAHs adsorption and biodegradation of biological repair,X172
  11. Degradation of soil Ethametsulfuron Isolation and identification of fungi,S154.3
  12. Analysis of Genetic Diversity and Important Traits about Species of Uncultivated Agaricus Bisporus in Qinghai-Tibet Plateau,S646
  13. Biofilm wastewater for showers surfactants and ammonia removal Study,X703
  14. Heavy metal ions on aerobic activated sludge activity impact study,X703.1
  15. Improvement the immobilized sludge degradation of ice cream wastewater produced hydrogen and immobilized carrier,X703
  16. Treatment of Wastewater Containing Strontium and Cesium by Combined Microfiltration Process and Pelleting Process,X703
  17. Pu'er tea flavor ingredients and microbiological changes during storage,TS272
  18. The Study on Formaldehyde Absorption Capacity in 18 Ornamental Plants,S688
  19. Characteristics of Grain Size and Element Geochemistry of Garze a Section on West Sichuan Plateau,P532
  20. Using D-InSAR to Monitor the Motion of Frozen Ground in Qinghai-Tibet Plateau,P642.14
  21. A Study on the Activity of Maduo-Gande Fault,P542.3

CLC: > Astronomy,Earth Sciences > Geology > Of ore deposits > Genesis of
© 2012 www.DissertationTopic.Net  Mobile