Acid mine drainage and acid rock drainage contain sulfuric acid together with heavy metals. Biological treatment often relies on sulfate reducing bacteria which use organic electron donating substrates to enable bacteria to reduce sulfate to sulfide, subsequently sulfides precipitate heavy metals. However, excess sulfides are released from the treatment system, so the process is not very effective in removing sulfur. Excess sulfides have oxygen demand, are corrosive and malodorous. A process developed at the University of Arizona uses zero vale
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