A new model for simulating microbial cyanide production and optimizing the medium parameters for recovering precious metals from waste printed circuit boards

Yuan, Zeming; Ruan, Jujun; Li, Yaying; Qiu, Rongliang

doi:10.1016/j.jhazmat.2018.04.007

Cited by 60 publications

(20 citation statements)

References 30 publications

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“…One percent of strain culture with OD 600nm adjusted was transferred into new R2A medium with different pH levels (2–12, additional NaCl = 0%), different additional NaCl (0–10%, pH = 7.0) concentrations, and different medium (LB, MM, R2A, and TY, pH = 7.0), individually. LB medium contained 10 g/L of tryptone, 5 g/L of yeast extract, and 10 g/L of NaCl, with pH adjusted to 7.0 by HCl or NaOH [ 47 ]. MM medium contained 2.0 g/L of sodium gluconate, 6.06 g/L of trimethylaminomethane, 4.68 g/L of NaCl, 1.49 g/L of KCl, 1.07 g/L of NH 4 Cl, 0.43 g/L of Na 2 SO 4 , 0.005 g/L of ferric ammonium citrate, 0.2 g/L of MaCl 2 ·6H 2 O, 0.03 g/L of CaCl 2 ·2H 2 O, 0.23 g/L of Na 2 HPO 4 ·12H 2 O, 1.5 mg/L of FeCl 2 ·4H 2 O, 0.19 mg/L of CoCl 2 ·6H 2 O, 0.1 mg/L of MnCl 2 ·4H 2 O, 62 μg/L of H 3 BO 3 , 70 μg/L of ZnCl 2 , 36 μg/L of Na 2 MoO 4 ·2H 2 O, 24 μg/L of NiCl 2 ·6H 2 O, and 17 μg/L of CuCl 2 ·2H 2 O, with pH adjusted to 7.0 by HCl or NaOH [ 26 ].…”

Section: Methodsmentioning

confidence: 99%

Characterization of Two Highly Arsenic-Resistant Caulobacteraceae Strains of Brevundimonas nasdae: Discovery of a New Arsenic Resistance Determinant

Yang

Feng

et al. 2022

IJMS

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Arsenic (As), distributed widely in the natural environment, is a toxic substance which can severely impair the normal functions in living cells. Research on the genetic determinants conferring functions in arsenic resistance and metabolism is of great importance for remediating arsenic-contaminated environments. Many organisms, including bacteria, have developed various strategies to tolerate arsenic, by either detoxifying this harmful element or utilizing it for energy generation. More and more new arsenic resistance (ars) determinants have been identified to be conferring resistance to diverse arsenic compounds and encoded in ars operons. There is a hazard in mobilizing arsenic during gold-mining activities due to gold- and arsenic-bearing minerals coexisting. In this study, we isolated 8 gold enrichment strains from the Zijin gold and copper mine (Longyan, Fujian Province, China) wastewater treatment site soil, at an altitude of 192 m. We identified two Brevundimonas nasdae strains, Au-Bre29 and Au-Bre30, among these eight strains, having a high minimum inhibitory concentration (MIC) for As(III). These two strains contained the same ars operons but displayed differences regarding secretion of extra-polymeric substances (EPS) upon arsenite (As(III)) stress. B. nasdae Au-Bre29 contained one extra plasmid but without harboring any additional ars genes compared to B. nasdae Au-Bre30. We optimized the growth conditions for strains Au-Bre29 and Au-Bre30. Au-Bre30 was able to tolerate both a lower pH and slightly higher concentrations of NaCl. We also identified folE, a folate synthesis gene, in the ars operon of these two strains. In most organisms, folate synthesis begins with a FolE (GTP-Cyclohydrolase I)-type enzyme, and the corresponding gene is typically designated folE (in bacteria) or gch1 (in mammals). Heterologous expression of folE, cloned from B. nasdae Au-Bre30, in the arsenic-hypersensitive strain Escherichia coli AW3110, conferred resistance to As(III), arsenate (As(V)), trivalent roxarsone (Rox(III)), pentavalent roxarsone (Rox(V)), trivalent antimonite (Sb(III)), and pentavalent antimonate (Sb(V)), indicating that folate biosynthesis is a target of arsenite toxicity and increased production of folate confers increased resistance to oxyanions. Genes encoding Acr3 and ArsH were shown to confer resistance to As(III), Rox(III), Sb(III), and Sb(V), and ArsH also conferred resistance to As(V). Acr3 did not confer resistance to As(V) and Rox(V), while ArsH did not confer resistance to Rox(V).

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Section: Methodsmentioning

confidence: 99%

Characterization of Two Highly Arsenic-Resistant Caulobacteraceae Strains of Brevundimonas nasdae: Discovery of a New Arsenic Resistance Determinant

Yang

Feng

et al. 2022

IJMS

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“…Deep extraction is the recovery of metals from LFP materials, which is an important source (Yuan et al, 2018). Deep extraction mainly includes chemical reduction (Meng et al, 2018a), acid leaching (Zhang et al, 2018a(Zhang et al, , 2018b, bioleaching (Wang et al, 2018a), electrochemical method (Meng et al, 2018b), carbon reductant combined with selective leaching (Huang et al, 2019;Zhang et al, 2018aZhang et al, , 2018b, and heat treatment combined leaching (Huang et al, 2018;Wang et al, 2018b).…”

Section: Evaluation Of Automatic Linementioning

confidence: 99%

Environmentally friendly automated line for recovering aluminium and lithium iron phosphate components of spent lithium-iron phosphate batteries

Zhu

Zhan³

et al. 2021

Waste Manag Res

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Lithium iron phosphate (LFP) batteries contain metals, toxic electrolytes, organic chemicals and plastics that can lead to serious safety and environmental problems when they are improperly disposed of. The published literature on recovering spent LFP batteries mainly focuses on policy-making and conceptual design. The production line of recovering spent LFP batteries and its detailed operation are rarely reported. A set of automatic line without negative impact to the environment for recycling spent LFP batteries at industrial scale was investigated in this study. It includes crushing, pneumatic separation, sieving, and poison gas treatment processes. The optimum retaining time of materials in the crusher is 3 minutes. The release rate is the highest when the load of the impact crusher is 800 g. An air current separator (ACS) was designed to separate LFP from aluminium (Al) foil and LFP powder mixture. Movement behaviour of LFP powder and Al foil in the ACS were analysed, and the optimized operation parameter (35.46 m/s) of air current speed was obtained through theoretical analysis and experiments. The weight contents of an Al foil powder collector from vibrating screen-3 and LFP powder collector from bag-type dust collector are approximately 38.7% and 52.4%, respectively. The economic cost of full manual dismantling is higher than the recovery production line. This recycling system provides a feasible method for recycling spent LFP batteries.

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“…To obtain kinetic parameters of cell growth and cyanide production, a revised logistic model (Mu et al, 2006) and an empirical model proposed by Yuan et al (2018) according to an allometric equation (Enquist et al, 1998) were used. Figure 10B shows the kinetic models obtained for cell growth and cyanide production.…”

Section: Kinetics Of Cell Growth and Cyanide Productionmentioning

confidence: 99%

A Systems-Based Approach for Cyanide Overproduction by Bacillus megaterium for Gold Bioleaching Enhancement

Aminian-Dehkordi

Mousavi

Marashi

et al. 2020

Front. Bioeng. Biotechnol.

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A new model for simulating microbial cyanide production and optimizing the medium parameters for recovering precious metals from waste printed circuit boards

Cited by 60 publications

References 30 publications

Characterization of Two Highly Arsenic-Resistant Caulobacteraceae Strains of Brevundimonas nasdae: Discovery of a New Arsenic Resistance Determinant

Characterization of Two Highly Arsenic-Resistant Caulobacteraceae Strains of Brevundimonas nasdae: Discovery of a New Arsenic Resistance Determinant

Environmentally friendly automated line for recovering aluminium and lithium iron phosphate components of spent lithium-iron phosphate batteries

A Systems-Based Approach for Cyanide Overproduction by Bacillus megaterium for Gold Bioleaching Enhancement

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