Using biochemical system to improve cinnabar dissolution

Wang, Y.J.; Li, H.Y.; Hu, H.F.; Li, D.P.; Yang, Yi; Liu, C.

doi:10.1016/j.biortech.2013.01.010

Cited by 15 publications

(10 citation statements)

References 17 publications

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“…During the operation, few jarosite crystal deposits could be found in reaction. This is very different from the biooxidation of ferrous iron since iron in 9K medium would facilitate jarosite and Schwertmannite precipitation [10,19]. The precipitation would have a negative effect on the transport of substrate because of kinetic barriers [1].…”

Section: Biooxidation Of Ferrous Iron Citrate With Shake Flask Experimentioning

confidence: 97%

“…The bacteria were cultured in 9K medium proposed by Silverman and Lundgren [15] [11,19]. The sodium salts of citrate were supplied as chelating agents.…”

Section: Microorganism and Cultivationmentioning

confidence: 99%

“…After that, the reactor was operated under stable conditions. Our previous study showed that the biooxidation rate was limited by the dilution rate and air flow rate greatly [19]. The influence of dilution rate and air flow rate on chelated iron regeneration behavior was examined in the reactor during the 40-day operation.…”

Section: Biooxidation Of Ferrous Iron Citrate With Shake Flask Experimentioning

confidence: 99%

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A novel regeneration of iron citrate solution by biooxidation of iron-oxidizing bacteria

Wang

Liu

et al. 2014

Journal of Industrial Microbiology and Biotechnology

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Liquid phase oxidation process using chelated iron solution is among the most promising techniques for the hydrogen sulfide removal due to its double advantage of waste minimization and resource recovery. Regeneration of chelated iron is a core reaction in this process. Regeneration of chelated iron in acidic solution is very difficult. In this paper, a novel regeneration of iron citrate in acidic solution by biooxidation of iron-oxidizing bacteria was reported firstly. By using such a process, the influence of iron-oxidizing bacteria on the regeneration rate was investigated. The results demonstrated the regeneration rate with the new technology was increased significantly. The process may contribute to the biooxidation of iron-oxidizing bacteria. Application of this novel process increased the regeneration rate under the optimum conditions, suggesting the iron citrate regeneration process may be a feasible and economical method in application.

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Section: Biooxidation Of Ferrous Iron Citrate With Shake Flask Experimentioning

confidence: 97%

“…The bacteria were cultured in 9K medium proposed by Silverman and Lundgren [15] [11,19]. The sodium salts of citrate were supplied as chelating agents.…”

Section: Microorganism and Cultivationmentioning

confidence: 99%

Section: Biooxidation Of Ferrous Iron Citrate With Shake Flask Experimentioning

confidence: 99%

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A novel regeneration of iron citrate solution by biooxidation of iron-oxidizing bacteria

Wang

Liu

et al. 2014

Journal of Industrial Microbiology and Biotechnology

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“…The latter pathway is associated with iron-oxidizing bacteria. The Fe 3+ is reduced after oxidizing S 2-and regenerated Fe 3+ in the presence of the bacteria, as a result, more S 2-can be oxidized and the iron-oxidizing bacteria promotes the dissolution of cinnabar (64,65).…”

Section: Enhanced Hgs Dissolution In the Environmentmentioning

confidence: 99%

“…Instead of being the sink, recent studies showed that cinnabar can also serve as a continuous source of inorganic Hg in the natural environment because a variety of environmental factors can facilitate the solubility of cinnabar. These factors include the presence of iron(III) (60), sulfide (61), dissolved organic matter (DOM) (59,62,63), and aquatic microorganisms (64,65). The enhanced dissolution of cinnabar facilitated by these environmental factors could be an important process controlling Hg cycling in the aquatic environment.…”

Section: Dissolution Of Hgs In the Aquatic Environmentmentioning

confidence: 99%

Mercury Sulfide Dissolution in Environmental Conditions: Thermodynamic and Kinetic Approaches

Jiang¹

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Considering the lack of feasible techniques to differentiate dissolution and readsorption processes, I first developed an efficient method using isotope tracer and isotope dilution techniques to investigate the re-adsorption of released Hg during HgS dissolution.The HgS dissolution rate with consideration of re-adsorption was two times the rate calculated from detecting Hg alone in the presence of O2, indicating the importance of Hg re-adsorption during HgS dissolution. I further examined the role of Hg-ligand complexation in HgS dissolution and Hg(II) re-adsorption using a thermodynamic vii adsorption method, selecting L-cysteine (Cys) as a model compound for low molecular weight ligands and Waskish fulvic acid (FA) for natural dissolved organic matter (DOM).My results suggest that the presence of Cys enhanced HgS dissolution through the decreased re-adsorption of Hg-Cys complex, whereas Waskish FA inhibited HgS dissolution, possibly because of the adsorption of FA on HgS surface that covered dissolution sites.I further employed a geochemical modeling method to study Hg speciation and the relation of iHg speciation to MeHg, aiming to provide a methodological example for potentially evaluating the implications of Hg species distribution during HgS dissolution on MeHg production. I applied geochemical model PHREEQC to the Florida Everglades, a well-studied wetland with model input parameters available, to determine the distribution of iHg in surface water at different sites. The modeling results suggest that sulfide and DOM govern iHg speciation, and the Hg-sulfide and Hg-DOM species are related to MeHg in environmental media but not fish, suggesting the importance of iHg speciation in MeHg production and the complexity of Hg bioaccumulation.viii water, soil, and sediment and can be methylated to the toxic MeHg through microbemediated (e.g., sulfate reducing bacteria, SRB or iron reducing bacteria, IRB) and abiotic processes (7, 9, 10). Because of its lipophilic and protein-binding properties, MeHg is then easily accumulated by aquatic biota through the food web (7).All Hg forms, in particular the organomercury species, are highly toxic substances (11).Acute Hg exposure can produce permanent damage to the nervous and other systems to cause a range of symptoms such as paresthesia, ataxia, sensory disturbances, tremors, renal toxicity, myocardial infarction, and even death (12). Chronic Hg exposure was considered to mainly occur from the consumption of contaminated fish and other aquatic organisms (13,14). Rice is another important pathway for human exposure to MeHg in recent years. 2This was first discovered in Guizhou province, China, and it potentially exists elsewhere (15-17). The toxicity of Hg depends on the chemical form and the sources of exposure (11).The most dangerous mercury species is MeHg, which is obtained mainly from the diet and can be almost completely absorbed into blood and then be distributed to other organs in the human body, such as brain, kidney, liver, hair, and other tissues within a f...

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Combination of Vortex Agitation and Ultrasonic Irradiation for Mercury Removal from Sediment by Acid Extraction

Nugraha

Jeong

Dinh

et al. 2022

Bull Environ Contam Toxicol

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Using biochemical system to improve cinnabar dissolution

Cited by 15 publications

References 17 publications

A novel regeneration of iron citrate solution by biooxidation of iron-oxidizing bacteria

A novel regeneration of iron citrate solution by biooxidation of iron-oxidizing bacteria

Mercury Sulfide Dissolution in Environmental Conditions: Thermodynamic and Kinetic Approaches

Combination of Vortex Agitation and Ultrasonic Irradiation for Mercury Removal from Sediment by Acid Extraction

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