Bioreduction of selenite and tellurite by phanerochaete chrysosporium. (2021)

• Record Type: Book
• Further Information: Note: Erika Jimena Espinosa-Ortiz.
• Authors: Espinosa-Ortiz, Erika Jimena
• Contents: 1 General introduction ; 1.1 Background; 1.2 Problem statement; 1.3 Research objectives; 1.4 Structure of the thesis; 1.5 References 2 Literature review; 2.1 Introduction; 2.2 Fungal pellets; 2.2.1 Fungal pellets: formation and growth; 2.2.2 Factors influencing the characteristics and formation of pellets; 2.2.3 Fungal pellets in bioreactors; 2.3 Fungal pelleted bioreactors for wastewater treatment; 2.3.1 Potential applications and challenges; 2.3.2 Reactor configurations; 2.3.3 Reactor design for fungal pelleted reactors; 2.3.4 Sterile versus non‐sterile conditions; 2.3.5 Biomass recycle in fungal pelleted reactors; 2.4 Removal of organic and inorganic pollutants; 2.4.1 Removal of organic pollutants; 2.4.2 Removal of inorganic pollutants; 2.5 Scope for further research; 2.6 Conclusions; 2.7 References 3 Effects of selenium oxyanions on the fungus Phanerochaete chrysosporium; 3.1 Introduction; 3.2 Materials and methods; 3.2.1 Fungal culture and medium composition; 3.2.2 Batch experiments; 3.2.3 Transmission electron microscopy (TEM) and electron‐energy loss spectroscopy (EELS) analysis; 3.2.4 Analytical methods; 3.3 Results; 3.3.1 Fungal interaction with selenium oxyanions; 3.3.2 Effect of glucose concentration; 3.3.3 Effect of pH; 3.3.4 Effects of selenium concentration; 3.4 Discussion; 3.4.1 Inhibition of fungal growth induced by selenium oxyanions; 3.4.2 Morphological effects induced by selenium oxyanions; 3.4.3 Removal of selenium oxyanions by P. chrysosporium; 3.4.4 Production of Se0 by P. chrysosporium; 3.4.5 Potential applications; 3.5 References 4 Removal of selenite from wastewater in a Phanerochaete chrysosporium pellet based fungal bioreactor; 4.1 Introduction; 4.2 Materials and methods; 4.2.1 Strain, medium composition and pre‐cultivation of fungal cultures; 4.2.2 Bioreactor configuration and operating conditions; 4.2.3 Analytical methods; 4.2.4 Statistical analysis; 4.3 Results; 4.3.1 Bioreactor operation in batch mode; 4.3.2 Continuous bioreactor operation at constant selenium concentrations; 4.3.3 Bioreactor response to spikes of selenium concentration; 4.3.4 Evolution and growth of the fungal biomass; 4.4 Discussion; 4.4.1 Removal of selenite in a fungal pelleted bioreactor; 4.4.2 Response of the system to selenium spikes; 4.4.3 Fungal morphology in the bioreactor; 4.4.4 Operational advantages of fungal pelleted reactors; 4.4.5 Longevity of reactor operation; 4.5 Conclusions; 4.6 References 5 Sorption of zinc onto elemental selenium nanoparticles immobilized in Phanerochaete chrysosporium pellets; 5.1 Introduction; 5.2 Experimental; 5.2.1 Biosorbent preparation; 5.2.2 Biosorbent characterization ; 5.2.3 Batch adsorption experiments; 5.2.4 Analytical methods; 5.3 Results; 5.3.1 Characterization of biosorbent material; 5.3.2 Effects of operational parameters on sorption capacity of nSe0‐pellets; 5.3.3 Sorption kinetics; 5.3.4 Adsorption isotherms; 5.4 Discussion; 5.4.1 Sorption mechanisms of Zn onto nSe0 pellets; 5.4.2 Effects of operational parameters on sorption capacity of nSe0‐pellets; 5.4.3 Potential applications; 5.4.4 Conclusions; 5.5 References 6 Effect of selenite on the morpholoy and respiratory activity of Phanerochaete chrysosporium biofilms; 6.1 Introduction; 6.2 Materials and methods; 6.2.1 Fungal strain and culturing conditions; 6.2.2 Biofilm growth and exposure experiments; 6.2.3 Microsensor measurements; 6.2.4 Biofilm sectioning and imaging; 6.2.5 Analytical methods; 6.3 Results; 6.3.1 Influence of short‐term SeO3 2‐ exposure on P. chrysosporium biofilm activity; 6.3.2 Influence of long‐term SeO3 2‐ exposure on P. chrysosporium biofilm activity; 6.4 Discussion; 6.4.1 Inhibition of developed P. chrysosporium biofilms by SeO3 2‐; 6.4.2 Influence of SeO3 2‐ on the physical and morphological properties of P. chrysosporium biofilms; 6.5 Conclusions; 6.6 References 7 Biomineralization of tellurium and selenium‐tellurium nanoparticles by the white‐rot fungus Phanerochaete chrysosporium; 7.1 Introduction; 7.2 Materials and methods; 7.2.1 Fungal strain and culturing conditions; 7.2.2 Batch experiments; 7.2.3 Characterizations of fungal morphology; 7.2.4 Analytical methods; 7.3 Results; 7.3.1 Fungal interaction with chalcogen oxyanions; 7.3.2 Effect of Se:Te ratio on tellurite reduction; 7.3.3 Fungal morphology; 7.3.4 Electron microscopic analysis; 7.4 Discussion; 7.4.1 P. chrysosporium as a tellurite‐reducing organism; 7.4.2 Synergetic effect of selenite and tellurite on P. chrysosporium; 7.4.3 Morphological effects induced by tellurite and Se‐Te combinations; 7.4.4 Production of nTe0 and nSe‐Te; 7.5 Conclusions; 7.6 References 8 Mycotechnology for the treatment of Se and Te contaminated effluents and biomineralization of Se0 and Te0 nanoparticles; 8.1 Mycotechnology; 8.2 Fungal technology in the removal of Se and Te from wastewater; 8.3 Fungi as Se0 and Te0 nanofactories; 8.4 Novel hybrid fungal sorbents containing nanoparticles for wastewater; 8.5 Fungal technology for the removal of selenium and potential applications of the Se0 nanoparticles immobilized in fungal pellets; 8.6 Conclusions and future perspectives; 8.7 References Appendix 1
• Edition: 1st
• Publisher Details: Boca Raton : CRC Press
• Publication Date: 2021
• Extent: 1 online resource
• Subjects: 628.358; Sewage -- Purification -- Heavy metals removal; Selenite; Tellurites; Phanerochaete; Heavy metals
• Languages: English
• ISBNs: 9781351463751
• Related ISBNs: 9781351463768; 9781315138381
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