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Microbial Cyanidation of Gold
Published in Sadia Ilyas, Jae-chun Lee, Gold Metallurgy and the Environment, 2018
The cyanogenic bacterial species like Chromobacterium violaceum, Pseudomonas fluorescens, Pseudomonas aureofaciens, Pseudomonas aeruginosa, Pseudomonas plecoglossicida, Pseudomonas putida, Pseudomonas syringae, Bacillus megaterium, archaea species viz. Ferroplasma acidipholum, and Ferroplasma acidarmanus, and some fungal species such as Marasmius oreades, Clitocybe sp., and Polysporus sp. have been reported so far (Knowles, 1976; Askeland and Morrison, 1983; Paterson, 1990; Flaishman, 1996; Golyshina et al., 2000; Faramarzi et al., 2004; Faramarzi and Brandl, 2006; Brandl et al., 2008; Hol et al., 2011). However, the application of fungi and archaea is limited, and commercially available microbial isolates (Chromobacterium violaceum and Pseudomonas fluorescens) are the most commonly studied.
Microbial Processes for Treatment of e-Waste Printed Circuit Boards and Their Mechanisms for Metal(s) Solubilization
Published in Ram Chandra, R.C. Sobti, Microbes for Sustainable Development and Bioremediation, 2019
Shailesh R. Dave, Asha B. Sodha, Devayani R. Tipre
Since 1898, the cyanidation process has been known for the extraction of gold and silver from gold-containing minerals (Smith and Mudder 1991). Several bacteria and fungi are reported for HCN production; among these few organisms capable of HCN production are reported for gold extractions from e-Waste. Bacteria such as Chromobacteriun violaceum, Pseudomonas fluorescens, Pseudomonas plecoglossicida, and Pseudomonas aeruginosa are reported for gold solubilization due to HCN production. Some members from fungi such as Marasmius oreades and species of Clitocyde and Polysphrous are reported for HCN production, so they could be used for gold and silver extraction from e-Waste (Dave et al. 2018, 2016a).
Zinc and copper supplements enhance trichloroethylene removal by Pseudomonas plecoglossicida in water
Published in Environmental Technology, 2022
Lan Qiu, Keng Seng Lok, Qihong Lu, Hua Zhong, Xiaoyuan Guo, Hojae Shim
In this study, the main objective was to study the effects of two representative microelements (zinc and copper) on the TCE co-metabolism utilising toluene as growth substrate. The microorganism used was previously isolated from a heavily petroleum-contaminated site and identified as Pseudomonas plecoglossicida [37]. Pseudomonas plecoglossicida is a Gram-negative, aerobic and rod-shaped bacterium, which is closely related to P. putida, showing > 99% of similarity of the 16S rRNA gene [38]. Pseudomonas strains are prevalent cultivatable aerobic monoaromatic degraders across diverse environments [39], which have been demonstrated efficient in co-metabolising TCE with the presence of toluene [10,14]. Different concentrations of Zn and Cu provided in forms of sulfate and chloride salts were evaluated at the fixed concentrations of TCE and toluene. The cell growth and metal concentrations were both monitored to further characterise the TCE co-metabolism by P. plecoglossicida. In this study, the main objective was to assess the effects (stimulatory/inhibitory) of zinc (Zn2+) and copper (Cu2+) supplements on the aerobic co-metabolic removal of TCE by the isolate Pseudomonas plecoglossicida, utilising toluene as growth substrate. Results from this study could expand our knowledge on microelements mediated TCE co-metabolism by P. plecoglossicida and shed light on in situ bio-stimulation with proper zinc and copper to enhance the removal of toluene and trichloroethylene.