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ACID MINE DRAINAGE PILOT REMEDIATION SYSTEM USING WASTE
PRODUCTS FROM THE STEEL MANUFACTURING AND SUGAR INDUSTRIES
Naidu, T.S., C.M. Sheridan, L.D. Van Dyk, and A. Higginson.
International Mine Water Association (IMWA) Conference, 15-19 July, Perm, Russia, 2019
A 2-step chemical and biological treatment scheme that incorporates steel slag and sugarcane bagasse waste products was pilot-scale tested to treat acid mine drainage (AMD). A slag eluate buffered AMD and precipitated metals in a sedimentation tank. AMD was then passed through a packed bed containing sugarcane bagasse inoculated with sulfate-reducing bacteria (SRB) as a polishing step to remove sulfate, precipitate metal sulfides, and elevate pH to near-neutral conditions. A portion of the effluent was recycled through a packed bed of slag to create the eluate for pre-treatment of the raw AMD solution. The AMD was characterized by pH 2.6 and was contaminated with 174 mg/L Al, 245 mg/L Ca, 4289 mg/L Fe, 334 mg/L Mn, 415 mg/L Mg and 16333 mg/L SO42-. Operation of the pilot-scale system treating 200-1000 L/day has thus far shown maximum Al, Fe, Mn and SO42- removals of 97%, 87%, 100%, and 87%, respectively. The dissolution of the slag and the alkalinity generation was found to occur mainly due to CaO and MgO dissolution. The SRB functioned in the slag eluate and a maximum sulfate reduction of 76% was found in the bioreactors. https://www.imwa.info/docs/imwa_2019/IMWA2019_Naidu_121.pdf
International Mine Water Association (IMWA) Conference, 15-19 July, Perm, Russia, 2019
A 2-step chemical and biological treatment scheme that incorporates steel slag and sugarcane bagasse waste products was pilot-scale tested to treat acid mine drainage (AMD). A slag eluate buffered AMD and precipitated metals in a sedimentation tank. AMD was then passed through a packed bed containing sugarcane bagasse inoculated with sulfate-reducing bacteria (SRB) as a polishing step to remove sulfate, precipitate metal sulfides, and elevate pH to near-neutral conditions. A portion of the effluent was recycled through a packed bed of slag to create the eluate for pre-treatment of the raw AMD solution. The AMD was characterized by pH 2.6 and was contaminated with 174 mg/L Al, 245 mg/L Ca, 4289 mg/L Fe, 334 mg/L Mn, 415 mg/L Mg and 16333 mg/L SO42-. Operation of the pilot-scale system treating 200-1000 L/day has thus far shown maximum Al, Fe, Mn and SO42- removals of 97%, 87%, 100%, and 87%, respectively. The dissolution of the slag and the alkalinity generation was found to occur mainly due to CaO and MgO dissolution. The SRB functioned in the slag eluate and a maximum sulfate reduction of 76% was found in the bioreactors. https://www.imwa.info/docs/imwa_2019/IMWA2019_Naidu_121.pdf
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