کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
233435 | 465342 | 2013 | 5 صفحه PDF | دانلود رایگان |
High rate sulfate reducing bioreactors can be effectively used in the treatment of acid mine drainage (AMD). The main disadvantage of sulfate reducing bioreactors is the requirement of a suitable carbon source and electron donor as the dissolved organic carbon content of AMD is usually quite low. In this study, a landfill leachate was used as a low-cost carbon source for sulfate reducing bacteria in a fluidized-bed (FBR) reactor for the treatment of synthetic AMD. Ethanol was replaced with leachate in the feed of FBR operated longer than 150 days at 35 °C. Although sulfate reduction rates decreased appreciably when ethanol (3.44 g sulfate/L/d) was replaced with leachate (0.90 g sulfate/L/d), leachate-fed FBR still performed well as the pH increased to neutral values, soluble metal removals were 82–99.9%, and total metal removals were 80–99.9%. In the case of leachate, electron flow to sulfate reduction decreased significantly. Higher performance may be achieved at chemical oxygen demand (COD)/sulfate ratios higher than 1.0. This study showed that leachate may be used as a low-cost soluble substrate for sulfate reducing bacteria in high rate bioreactors for AMD treatment.
► Sulfate reducing bioreactors are viable alternative for metal removal from AMD.
► Sulfate reducing bioreactors require a suitable carbon/electron supplementation.
► Low cost liquid substrates should be considered for sulfidogenic bioreactors.
► Landfill leachate is a good organic substrate for sulfidogenic AMD treatment.
► High metal removal from AMD can be attained in a leachate-fed sulfidogenic FBR.
Journal: Minerals Engineering - Volume 48, July 2013, Pages 56–60