AI Article Synopsis
- Acid mine drainage (AMD) is a significant environmental issue marked by low pH and high metal content, often treated by oxidizing iron biologically and controlling pH.
- A study conducted using a ceramic membrane bioreactor (CMBR) explored the effects of different hydraulic retention times and feed iron concentrations on the treatment of AMD containing multiple metals.
- Results showed nearly complete iron oxidation and efficient performance of the bioreactor enriched with specific microbial cultures, highlighting that organic nutrients and higher iron concentrations improved treatment outcomes, while organic matter removal decreased iron oxidation rates.
Article Abstract
Acid mine drainage (AMD), generated in the active and abandoned mine sites, is characterized by low pH and high metal concentrations. One AMD treatment possibility is biologically oxidizing Fe followed by precipitation through pH control. As compared to autotrophic iron oxidizing microbial community, a microbial community enriched in the presence of organic nutrients was hypothesized to yield higher biomass during commissioning the bioreactor. In this study, the treatment of Fe, Cu, Co, Mn, Zn, Ni, and As containing simulated AMD was studied using an iron-oxidizing ceramic membrane bioreactor (CMBR) at varying hydraulic retention times (HRTs) (6-24 h) and two different feed Fe concentrations (250 and 750 mg/L). The impact of tryptone soya broth (TSB) on the CMBR performance was also investigated. Almost complete Fe oxidation and sustainable flux at around 5.0 L/(m.h) were obtained in the CMBR with the Alicyclobacillus tolerans and Acidiphilium cryptum dominated enrichment culture. The Fe oxidation rate, as assessed in batch operation cycles of CMBR, increased significantly with increasing Fe loading to the bioreactor. The iron oxidation rate decreased by the elimination of organic matter from the feed. The increase of the CMBR permeate pH to 3.5-4.0 resulted in selective co-precipitation of As and Fe (over 99%) with the generation of biogenic schwertmannite.
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| http://dx.doi.org/10.1016/j.watres.2021.117297 | DOI Listing |
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