PASSIVE TREATMENT OF LOW-PH, FERRIC IRON-DOMINATED ACID ROCK DRAINAGE IN A VERTICAL FLOW WETLAND II: METAL REMOVAL 1

@inproceedings{Thomas2002PASSIVETO,
  title={PASSIVE TREATMENT OF LOW-PH, FERRIC IRON-DOMINATED ACID ROCK DRAINAGE IN A VERTICAL FLOW WETLAND II: METAL REMOVAL 1},
  author={Robert C. Thomas and Christopher S. Romanek},
  year={2002}
}
A limestone-buffered organic substrate (LBOS) is used to passively remove iron (140 mg·L -1 ) and aluminum (85 mg·L -1 ) from low pH (<3), ferric iron-dominated acid rock drainage (ARD). Iron and aluminum removal is attributed to an increase in pH with precipitates of both elements segregated along a pH gradient. The increase in pH is rapid and occurs across a limestone dissolution front. Three distinct mineralogical zones demarcate the limestone dissolution front. The oxide zone overlies the… CONTINUE READING

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