Cleaner utilization of electroplating sludge by bioleaching with a moderately thermophilic consortium: A pilot study

Effective multi-metal removal from plant incineration ash via the combination of bioleaching and brine leaching

“…(2) Modified BCR sequential extraction procedure: a BCR (Community Bureau of Reference) sequential extraction procedure was used to describe the metal speciation and obtain exchangeable, reducible, oxidizable and residual fractions. 26 The extraction procedures were displayed as follows: ① exchangeable fraction: 20 mL of 0.11 M HOA per 0.5 g of dry ash was shaken for 16 h at 25 °C; ② reducible fraction: 20 mL of 0.5 M NH 2 OH·HCl (pH = 2.0) was added to the residue and shaken for 16 h at 25 °C; ③ oxidizable fraction: 5 mL of 8.8 M H 2 O 2 was added to the residue and digested for 1 h at 25 °C, and then for 1 h at 85 °C in a water bath with a second volume of H 2 O 2 . Then, the solution was evaporated to about 1 mL.…”

Bio-Based Processes for Material and Energy Production from Waste Streams under Acidic Conditions

“…From other genera, members of the genus Leptospirillum, such as L. ferriphilum and L. ferrooxidans, are often studied [103,104]. At the present time, thermophiles (such as Sulfobacillus thermosulfidooxidans, S. acidophilus, Ferroplasma thermophilum, Thermoplasma acidophilum) have also attracted more attention [105,106]. The application of sulfuric acid producing bacteria in metal recovery from low-grade ores is well-established biotechnology in the industry.…”

“…The exploitation of thermophilic bacteria seems to be another way how to overcome time and efficiency limitations. Zhou et al (2019) reached over 99% recovery of Cu, Zn, Ni, and Cr from electroplating sludge within 5 hours after application of the consortium of moderately thermophilic bacteria [105]. Total Mn dissolution was The most often used bacteria producing sulfuric acid as one of the leaching agents belong to the genus Acidithiobacillus.…”

Growth in Ever-Increasing Acidity Condition Enhanced the Adaption and Bioleaching of Leptospirlium Ferriphilum

“…Acidophiles were the most e cient community on the metals bioleaching from sul de minerals. Recent disclosures demonstrated that these microorganisms still conducted crucial function for metals extraction from solid waste such as waste printed wiring board (Xia et al, 2017), electroplating sludge (Zhou et al, 2019) and coal y ash (Fan et al, 2019). However, the ckle bioleaching environment such as uctuated pH and the increased metal ion was detrimental to the growth of microorganisms and thus weakened the biological effects, which resulted in low leaching e ciency.…”