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PERFORMANCE OF A SULFIDOGENIC BIOREACTOR INOCULATED WITH INDIGENOUS ACIDIC COMMUNITIES FOR TREATING AN EXTREMELY ACIDIC MINE WATER
Gonzales, D., Y. Liu, D.V. Gomez, G. Southam, S. Hedrich, P. Galleguillos, C. Colipai, et al.
Minerals Engineering 131:370:375(2019)

This study tested the performance of a low pH sulfidogenic bioreactor inoculated with an indigenous microbial community to treat mine-impacted water. The inoculum was obtained from anaerobic sediments collected from an acidic river located in northern Chile. The sulfidogenic bioreactor system (2.3 L) was operated as a continuous flow mode unit for 99 days at 30°C and fed with synthetic water based on the chemical composition of the acidic river. The bioreactor pH was set to 4.5 initially and was increased in stages to pH 6.0 during the experiment. Results show that zinc concentrations in liquors draining the bioreactor were below the detection level in most of the samples analyzed. Increasing the glycerol concentration increased the removal of iron (70%), but generated acetic acid (from 1 to 5 mM). Microbial populations changed with varying operation parameters, and a known acetogenic sulfidogen (Desulfoporosinus acididurans) became more dominant over time.



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