Water quality, fate of metals, and predictive model validation of a constructed wetland treating acid mine drainage

摘要: Abstract A 0.39 ha constructed wetland designed with 9 cells, including two anaerobic cells that were to stimulate dissimilatory sulfate reduction, was evaluated for its effect on water quality of a low-order acid mine drainage (AMD) stream in southeastern Ohio, U.S.A. Emphasis the uptake and fate selected metals accuracy simulation model predicted this specific wetland's behavior before it built. pH acidity showed little improvement through study period despite anoxic drain. Iron decreased an average 166 mg/l 32 mg/l aluminum 83 mg/l 56 mg/l from inflow outflow. Typha latifolia above-water peak biomass averaged 502 g/m 2 iron concentration 2.5 mg/g; plant accounted only 0.07% iron. concentrations sediments 14.3% dry weight surface (10 cm) 7.2% upper 30 cm no apparent spatial pattern or relationship vegetation. Simulations published prior construction removal retentions 50 98% 6.1 g Fe m −2  day −1 . When actual field data same year entered into model, generated 3.60 g retention. Both estimates (pre-wetland 1993 data) bracket 4.76 g Aluminum retention rates ranged 0 90% removal; had 60% removal.