Bioleaching of spent fluid catalytic cracking catalyst using Aspergillus niger

Aung, Khin Moh Moh; Ting, Yen‐Peng

doi:10.1016/j.jbiotec.2004.10.008

Cited by 182 publications

(75 citation statements)

References 12 publications

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“…Some studies have revealed that the bioleaching of Al can be carried out in cultures of A. thiooxidans with a yield of approximately 40% (Krebs et al, 1997). Other authors have reported that, on applying bioleaching with fungi, it is also possible to recover Al, with around 30% recovery (Aung and Ting, 2005;Santhiya and Ting, 2005). The solubilization of V was not influenced by the pulp density or by the type of leaching (chemical or microbial) used.…”

Section: Indirect Microbial Leachingmentioning

confidence: 97%

BIOLEACHING OF METALS FROM A SPENT DIESEL HYDRODESULFURIZATION CATALYST EMPLOYING Acidithiobacillus thiooxidans FG-01

Ferreira

Sérvulo

Costa

et al. 2017

Braz. J. Chem. Eng.

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-This study evaluates the recovery of heavy metals employing a spent catalyst from the hydrodesulfurization (HDS) of diesel, with no chemical, thermal or physical pretreatment, using the bacterial strain Acidithiobacillus thiooxidans FG-01. Direct and indirect bioleaching tests were carried out in Erlenmeyer flasks (500 mL). The influence of the pulp density and supplementation with elemental sulfur on the bioleaching were also investigated. The spent catalyst contained organochlorines, petroleum hydrocarbons and heavy metals in its composition. The best recovery results (26% Al, 26% V and 39% Mo) were achieved in the two-stage (indirect) bioprocess, with a pulp density of 50 g/L. It was not possible to recover Co, Cu and Ni (< 5%) under any of the conditions tested. The bacterial strain A. thiooxidans FG-01 was found to be a promising candidate for the recovery of Al, V and Mo using the crude spent HDS catalyst.

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Section: Indirect Microbial Leachingmentioning

confidence: 97%

BIOLEACHING OF METALS FROM A SPENT DIESEL HYDRODESULFURIZATION CATALYST EMPLOYING Acidithiobacillus thiooxidans FG-01

Ferreira

Sérvulo

Costa

et al. 2017

Braz. J. Chem. Eng.

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“…However, the biogenically produced organic acids play a major and direct role in the bioleaching process. Aung and Ting(2005) reported that the bioleaching efficiency is directly proportional to the organic acids present in the leaching medium.…”

Section: Sequential Extraction Of Arsenicmentioning

confidence: 99%

Optimization of As Bioleaching by Herbaspirillum sp. GW103 Coupled with Coconut Oil Cake

Govarthanan¹,

Praburaman²,

Kim³

et al. 2015

Journal of Soil and Groundwater Environment

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The objective of this study was to optimize the experimental conditions for bioleaching of arsenic (As) using Herbaspirillum sp. GW103 and to understand the interaction between bacteria and As during bioleaching. Five variables, temperature, time, CaCO 3 , coconut oil cake, and shaking rate, were optimized using response surface methodology (RSM) based Box-Behnken design (BBD). Maximum (73.2%) bioleaching of As was observed at 30ºC, 60 h incubation, 1.75% CaCO 3 , 3% coconut oil cake, and 140 rpm. Sequential extraction of bioleached soil revealed that the isolate Herbaspirillum sp. GW103 significantly reduced 28.6% of water soluble fraction and increased 38.8% of the carbonate fraction. The results of the study indicate that the diazotrophic bacteria Herbaspirillum sp. could be used for bioleaching As from mine soil.

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“…Thus, the recycling of e-waste not only reduces environmental damage caused by toxic metals (such as lead and cadmium) present in e-waste but also leads to precious metal recovery. Indeed, increased global consumption has also led to pressing need to discover more alternative sources of gold due to depleting natural resources and a worldwide increase in the demand for gold 5 . In the mining industry, naturally-occurring microorganisms have been exploited for extraction of metals from mining waste and lean ores.…”

Section: Introductionmentioning

confidence: 99%

Bio-extraction of precious metals from urban solid waste

Das

Natarajan

Ting

2017

AIP Conference Proceedings

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Abstract.Reduced product lifecycle and increasing demand for electronic devices have resulted in the generation of huge volumes of electronic waste (e-waste). E-wastes contain high concentrations of toxic heavy metals, which have detrimental effects on health and the environment. However, e-wastes also contain significant concentrations of precious metals such as gold, silver and palladium, which can be a major driving force for recycling of urban waste. Cyanogenic bacteria such as Chromobacterium violaceum generate cyanide as a secondary metabolite which mobilizes gold into solution via a soluble gold-cyanide complex. However, compared to conventional technology for metal recovery, this approach is not effective, owing largely to the low concentration of lixiviants produced by the bacteria. To overcome the challenges of bioleaching of gold from e-waste, several strategies were adopted to enhance gold recovery rates. These included (i) pretreatment of ewaste to remove competing metal ions, (ii) mutation to adapt the bacteria to high pH environment, (iii) metabolic engineering to produce higher cyanide lixiviant, and (iv) spent medium leaching with adjusted initial pH. Compared to 7.1 % recovery by the wild type bacteria, these strategies achieved gold recoveries of 11.3%, 22.5%, 30% and 30% respectively at 0.5% w/v pulp density respectively. Bioleached gold was finally mineralized and precipitated as gold nanoparticles using the bacterium Delftia acidovorans. This study demonstrates the potential for enhancement of biocyanide production and gold recovery from electronic waste through different strategies, and extraction of solid gold from bioleached leachate.

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Bioleaching of spent fluid catalytic cracking catalyst using Aspergillus niger

Cited by 182 publications

References 12 publications

BIOLEACHING OF METALS FROM A SPENT DIESEL HYDRODESULFURIZATION CATALYST EMPLOYING Acidithiobacillus thiooxidans FG-01

BIOLEACHING OF METALS FROM A SPENT DIESEL HYDRODESULFURIZATION CATALYST EMPLOYING Acidithiobacillus thiooxidans FG-01

Optimization of As Bioleaching by Herbaspirillum sp. GW103 Coupled with Coconut Oil Cake

Bio-extraction of precious metals from urban solid waste

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