Advances in biotreatment of acid mine drainage and biorecovery of metals: 2. Membrane bioreactor system for sulfate reduction.

摘要: Several biotreatmemt techniques for sulfate conversion by the reducing bacteria (SRB) have been proposed in past, however few of them practically applied to treat containing acid mine drainage (AMD). This research deals with development an innovative polypropylene hollow fiber membrane bioreactor system treatment water from Berkeley Pit, Butte, MT, using hydrogen consuming SRB biofilms. The advantages over conventional tall liquid phase sparged gas systems are: large microporous surface phase; formation sulfide outside membrane, preventing mixing pressurized inside membrane; no requirement recycle compressor; is suitable immobilization active SRB, resulting biofilms, thus washout problems associated suspended culture reactors; and lower operating costs bioreactors, eliminating recompression costs. Information provided on reduction rate studies biokinetic tests anaerobic digester sludge sediment master reactors biofilms bench-scale bioreactors. Biokinetic parameters determined models systems. Data are presented effect loading at 25, 50, 75 100 ml/min scale-up units, under varied temperatures (25, 35 40 °C) determine optimize conversions effective AMD biotreatment. Pilot-scale generated data flow rates (MGD) inlet concentrations influents resultant outlet concentration effluents number modules needed desired those pilot-scale indicate that bioreactors can be toward field-scale biotreatment recovery high purity metals agriculturally usable water.