Understanding of the biochemical events in a chemo-bioreactor during continuous acid mine drainage treatment |
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| Authors: | Bidus Kanti Das Santi M Mandal Jayanta Bhattacharya |
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| Institution: | (1) Department of Mining Engineering, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India;(2) Central Research Facility, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India; |
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| Abstract: | Spent mushroom compost (SMC) is widely used as reactor matrix in passive bioreactor involving sulfate reducing bacteria (SRB)
for acid mine drainage (AMD) treatment. Follow-up our previous report, recent work has been established the extent of activity,
sustained organic carbon availability, and the biochemical events of successive alkalinity producing system-based chemo-bioreactor
for continuous performance using SMC. Removal of iron and sulfate from influent was over 77 and 90%, respectively, for first
13 weeks, while sulfate removal efficiency suddenly dropped down to 31% thereafter. Ahead of 13th week, process failure was
beginning to be noticed when available dissolved organic carbon (DOC) value dropped down to 50 mg/L. SRB population was mostly
affected with DOC drought at this stage. Sulfur was one of the major elements found with other tested metals in blackish green
effluent precipitate. Sulfide compounds of the tested metals were formed on both exhausted chemo-bioreactor bed and precipitate.
FTIR analysis indicated that SMC was responsible for metal binding and available nutrients supply. The present study revealed
the feasibility of SMC as a host for treating AMD by this chemo-bioreactor that will assist in designing the continuous treatment
practice. |
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