Effects of sulfur dosage and inoculum size on pilot-scale thermophilic bioleaching of heavy metals from sewage sludge

Chen, Shen-Yi; Cheng, Yun-Kai

doi:10.1016/j.chemosphere.2019.06.084

Cited by 32 publications

(11 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Only 27.6-28.3% of the initial supply of sulfur (powder and prills) was utilized in the bioleaching process, and 0.181 g sulfur remained in per gram of fly ash after bioleaching with sulfur powder. Similar low sulfur oxidation degree was reported by substantial studies [15,22,23,27]. The remaining elemental sulfur would result in the reacidification of the treated fly ash [15,21], and should be recovered after the bioleaching treatments for environmental safety and economical efficiency concern.…”

Section: Ph and Sulfate Variations In Bioleaching With Different Sulfur Formssupporting

confidence: 76%

“…Not surprisingly, few heavy metals were solubilized during bioleaching without sulfur (Figure A1). It is known that biooxidation and acidification by sulfur oxidizing bacteria are the primary mechanisms of heavy metals solubilization in the bioleaching process [23]. In general, the solubilization of heavy metals in the bioleaching process was highly related to the pH value of the system [12,23].…”

Section: Heavy Metals Solubilization In Bioleachingmentioning

confidence: 99%

“…One of the critical technical parameters of bioleaching is the substrate supply. Sulfur powder is commonly used as the most efficient energy substrate in the bioleaching process utilizing sulfur oxidizing bacteria [12,19,[21][22][23][24]. In general, in order to ensure sufficient sulfuric acid production and metal solubilization, the optimal sulfur concentration ranging from 5 to 10 g per liter fly ash suspension is needed for fly ash bioleaching [19,25,26].…”

Section: Introductionmentioning

confidence: 99%

“…In general, in order to ensure sufficient sulfuric acid production and metal solubilization, the optimal sulfur concentration ranging from 5 to 10 g per liter fly ash suspension is needed for fly ash bioleaching [19,25,26]. However, about 40-70% of the sulfur powder could not be utilized during the bioleaching process [15,23,24,27]. A noteworthy and non-negligible issue is that the unused sulfur powder remaining in the treated wastes is difficult separate from the wastes after bioleaching and represents a potential reacidification risk to the disposal land due to the subsequent oxidation of sulfur to sulfuric acid [15,24].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Bioleaching of Heavy Metals from Municipal Solid Waste Incineration Fly Ash: Availability of Recoverable Sulfur Prills and Form Transformation of Heavy Metals

Zhang

Wei

Hao

et al. 2020

Metals

View full text Add to dashboard Cite

Bioleaching is an effective and promising approach for the recovery or removal of heavy metals from metal-laden municipal solid waste incineration fly ash. To exclude the risk of reacidification of the leached fly ash after bioleaching with sulfur powder, molded sulfur prills were used as energy substrate for sulfur oxidizing bacteria to examine the availability of reusing the recyclable sulfur forms. The chemical species of heavy metals during the bioleaching process were also investigated. Results showed that the pH reduction, sulfate production, and metal solubilization with sulfur prills were comparable to that with sulfur powder despite of the theoretically calculated smaller surface of the formers. After 15 days of bioleaching, 80.7–82.1% of Cd, 72.5–74.1% of Zn, 42.8–43.9% of Cu, 24.1–25.2% of Cr, and 12.4–13.0% of Pb were removed from the fly ash, respectively. During bioleaching, heavy metals in the acid extractable and reducible fraction were significantly removed, and metals in oxidizable from were partially reduced. The low leaching toxicity of heavy metals according to toxicity characteristic leaching procedure (TCLP) verified the effective detoxification of fly ash. Moreover, the comparable pH reduction and metal removal efficiencies of bioleaching process with recycled sulfur prills to that with fresh sulfur revealed the potential of reusing the recoverable sulfur prills in the bioleaching process for decontamination of heavy metals from municipal solid waste fly ash.

show abstract

Section: Ph and Sulfate Variations In Bioleaching With Different Sulfur Formssupporting

confidence: 76%

Section: Heavy Metals Solubilization In Bioleachingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Bioleaching of Heavy Metals from Municipal Solid Waste Incineration Fly Ash: Availability of Recoverable Sulfur Prills and Form Transformation of Heavy Metals

Zhang

Wei

Hao

et al. 2020

Metals

View full text Add to dashboard Cite

show abstract

“…Thus, it is evident that optimal Fe(II) concentration of 7 g/L is appropriate for iron-based bioleaching of the type of sphalerite used with L. ferriphilum. Approximately 85%-100% of zinc leaching efficiency has been accounted for somewhere else, which relies upon the type of mineral concentrate, microorganism, and conditions present during bioleaching [21][22][23]. The bioleached residue obtained at the flask using media with 7 g/L Fe(II) was subjected to energy-dispersive X-ray (EDX) analysis to analyze leached out zinc.…”

Section: Effect Of Fe(ii) On Bioleaching Of Zincmentioning

confidence: 99%

Effect of FE(II) Concentration on Bioleaching of Zinc from Sphalerite using Leptospirillum Ferriphilum: Kinetic Aspects

S*,

Adugna

et al. 2019

IJEAT

View full text Add to dashboard Cite

The objective of this study was to isolate an acidophilic iron-oxidizing bacterium, Leptospirillum ferriphilum, and explore the impacts of initial Fe(II) concentration on the bioleaching kinetics of zinc retrieval from sphalerite concentrate. L. ferriphilum strain was successfully isolated from Chitradurga mine, Karnataka, India, and molecular techniques for DNA sequencing were applied. The obtained nucleotide sequence was deposited to GenBank and accession number KF743135 was granted. The effect of Fe(II) on the iron-based bioleaching kinetics of zinc leaching using the L. ferriphilum isolate was ascertained under the following experimental conditions: inoculum size, 10% (v/v); bioleaching period, 20 days; system temperature, 301±2 K; initial pH, 3; pulp density 5% (w/v); and Fe(II) concentration in the medium, 1–9 g/L. The results demonstrated that efficiency of bioleaching was highly influenced by concentration of Fe(II) and maximized yield of 87.85% zinc was obtained at 7 g/L. The kinetic study specify that the rate constant estimations of zinc biosolubilization were moderately high at 7 g/L Fe(II), and the kinetic analysis using shrinking core model showed that the leaching rate is constrained by ash layer diffusion step

show abstract

Process Engineering Aspects in Bioleaching of Metals from Electronic Waste

Minimol

Kodialbail

Saidutta

2020

The Handbook of Environmental Chemistry

View full text Add to dashboard Cite

Effects of sulfur dosage and inoculum size on pilot-scale thermophilic bioleaching of heavy metals from sewage sludge

Cited by 32 publications

References 44 publications

Bioleaching of Heavy Metals from Municipal Solid Waste Incineration Fly Ash: Availability of Recoverable Sulfur Prills and Form Transformation of Heavy Metals

Bioleaching of Heavy Metals from Municipal Solid Waste Incineration Fly Ash: Availability of Recoverable Sulfur Prills and Form Transformation of Heavy Metals

Effect of FE(II) Concentration on Bioleaching of Zinc from Sphalerite using Leptospirillum Ferriphilum: Kinetic Aspects

Process Engineering Aspects in Bioleaching of Metals from Electronic Waste

Contact Info

Product

Resources

About