Impact of Fulvic Acid and Acidithiobacillus ferrooxidan Inoculum Amount on the Formation of Secondary Iron Minerals

Huang, Haitao; Geng, Kanghui; Wang, Chong; Wu, Xiu-Ping; Wei, Caichun

doi:10.3390/ijerph20064736

Cited by 3 publications

(1 citation statement)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The rate of Fe 3+ hydrolytic mineralization is directly proportional to the rate of Fe 3+ supply. A higher rate of Fe 3+ supply accelerated the formation of secondary minerals and increased the precipitation of TFe [50]. However, the rate of Fe 3+ hydrolytic mineralization slows down once Fe 2+ is completely oxidized.…”

Section: Effects Of Nitrogen Sources On Mineralization Efficiencymentioning

confidence: 99%

Effects of Different Nitrogen Sources on the Formation of Biogenic Jarosite

Huang,

Hu,

et al. 2023

Sustainability

Self Cite

View full text Add to dashboard Cite

The effects of nitrogen sources on the biosynthesis of jarosite were investigated by analyzing the changes in pH, Fe2+, total Fe (TFe), and jarosite production in a 9K culture medium containing different nitrogen sources. Three nitrogen sources, namely (NH4)2SO4, carbamide (CO(NH2)2), and NH4NO3, were used in this study. The solution’s pH and Fe2+ concentrations were set to 2.5 and 160 mmol/L, respectively. The results demonstrated that the three different nitrogen sources could be used by Acidithiobacillus ferrooxidans (A. ferrooxidans) LX5, but the degree of utilization differed. The addition of (NH4)2SO4 facilitated the growth of A. ferrooxidans LX5 compared with the other two nitrogen sources, while the bacterial activity in the CO(NH2)2 set was minimum. The pH of the solution had an inverse correlation with bacterial activity. The mineralization rate using (NH4)2SO4 as the nitrogen source was 42.48%, which was slightly higher than the rates obtained with CO(NH2)2 and NH4NO3 (31.67% and 35.35%, respectively). The resulting minerals showed a different appearance and chemical composition. However, the XRD spectra showed similar chemical structure. The jarosites were identified as a mixture of jarosite, ammonioiarosite, and carphosiderite.

show abstract

Section: Effects Of Nitrogen Sources On Mineralization Efficiencymentioning

confidence: 99%

Effects of Different Nitrogen Sources on the Formation of Biogenic Jarosite

Huang,

Hu,

et al. 2023

Sustainability

Self Cite

View full text Add to dashboard Cite

show abstract

The effect of calcium on the removal of Cd2+ in the formation of biogenic secondary iron minerals

Geng,

Wang,

et al. 2024

Sci Rep

View full text Add to dashboard Cite

Cadmium is a toxic heavy metal found in acid mine drainage. It hinders plant and animal growth and accumulates in human organs. In this study, through shake flask experiments, an iron-rich, sulphate-rich environment was simulated, and Acidithiobacillus ferrooxidans was used to mediate the formation of secondary high-iron minerals to explore the effect of calcium ions on the removal of Cd 2+ from that environment. Four treatment systems were used: “Blank”, “Ca 2+ -30 mg/L”, “Fe/K = 3,Ca 2+ -30 mg/L”, and “Fe/K = 3”. The results showed that Cd 2+ with an initial concentration of 20 mg/L was effectively removed in each treatment system. The removal efficiencies of Cd 2+ in each treatment were 23.46%, 18.42%, 52.88%, and 45.76% respectively. The quantity and type of minerals determined the removal efficiency of Cd 2+ . The Fe/K = 3 treatment system can significantly increase the amount of mineral formation and improve the removal efficiency of Cd 2+ . In the Ca 2+ -30 mg/L, Fe/K = 3 treatment system, the biological oxidation ability was the strongest, and the removal effect of Cd 2+ was the best under the combined action of K + and Ca 2+ . Co-precipitation was the main way to remove Cd 2+ during the formation of biogenic secondary iron minerals, and the removal amount was 5.64 to 14.83 times that of adsorption. Biogenetic secondary iron minerals showed high values in repairing heavy metal pollution. This study provides a theoretical basis for treating heavy metals in acid mine drainage.

show abstract

Effect of Rotation Speed and Fulvic Acid Concentration on Biogenic Secondary High-Iron Mineral Synthesis

Huang,

Ji,

Wang

et al. 2024

Water

View full text Add to dashboard Cite

From an engineering standpoint, investigating the effects of rotation speed and fulvic acid concentration on the development of secondary high-iron minerals is crucial for treating acid mine drainage. The Fe2+ oxidation mechanism by Acidithiobacillus (A.) ferrooxidans to synthesise secondary high-iron minerals was examined in this study using shaking flask tests under various conditions: fulvic acid concentrations of 0, 0.2, or 0.4 g/L and rotation speeds of 180 r/min or 100 r/min. The pH, Fe2+ oxidation rate, total iron precipitation rate, secondary high-iron mineral functional groups and ore equivalent indicators were also investigated. The results demonstrated that at a fulvic acid concentration of 0 g/L, the pH decreased from 2.5 to 2.17 at 180 r/min. At 0.2 g/L, it decreased from 2.5 to 2.05. Finally, at 0.4 g/L, it decreased from 2.5 to 2.07. Fe2+ was completely oxidised after 48 h, and the final total iron precipitation rate ranged from 26.2% to 33.4%. The synthesised secondary high-iron minerals were uniformly dispersed in the solution. When the rotation speed was 100 r/min, the pH reduced from 2.5 to 2.25 at a fulvic acid concentration of 0 g/L, from 2.5 to 2.14 at 0.2 g/L, and from 2.5 to 2.19 at 0.4 g/L. Notably, Fe2+ was completely oxidised within 72 h. The experiment’s final iron precipitation rate ranged from 23.6 to 29.6%. The synthesised secondary high-iron minerals were blocky and adhered to the bottom of the shaking flask. In summary, at a rotation speed of 180 r/min or 100 r/min, the Fe2+ oxidation rate and total iron precipitation rate of the experimental group with a fulvic acid concentration of 0.2 g/L were higher than those of the control group and the experimental group with a fulvic acid concentration of 0.4 g/L. A fulvic acid concentration of 0.2 g/L enhanced the activity of A. ferrooxidans. The minerals obtained from these experiments were characterised and identified as schwertmannite and jarosite.

show abstract

Impact of Fulvic Acid and Acidithiobacillus ferrooxidan Inoculum Amount on the Formation of Secondary Iron Minerals

Cited by 3 publications

References 33 publications

Effects of Different Nitrogen Sources on the Formation of Biogenic Jarosite

Effects of Different Nitrogen Sources on the Formation of Biogenic Jarosite

The effect of calcium on the removal of Cd2+ in the formation of biogenic secondary iron minerals

Effect of Rotation Speed and Fulvic Acid Concentration on Biogenic Secondary High-Iron Mineral Synthesis

Contact Info

Product

Resources

About