Sulfate reduction and the precipitation of metal sulfides may have great potential to improve water quality of mine effluents in wetland treatment systems. Laboratory exeperiments using sulfate reducing bacteria(SRB) and limestone to treat effluents from the abandoned Dalsung tungsten-copper mine show that encouraging results, that have been attributed to sulfate reduction. Fe, Al, Cd, Cu and Zn are reduced to below detection limits with 99-100% metal removal rates, Mn is reduced by at least 90% to below 8.0mg/l, and the pH is raised from 5.12 to 7.60 after 53 days of experiments. In the staged design, laboratory experiments are initiated to determine what would be reasonable substrate materials for remadiation of the mine effluents. A substrate mixture containing 70% oak compost and 30% mushroom compost maintains 0.03-0.04mM of lactate, which provides good condition for the SRB granule. A downflow SRB wetland system is proposed as follows: 1) The lower part of the treatment system consists with a 25cm
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