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Figure 7-5 appears to be incorrect. It appears to be that of the SPARRO process and not the ettringite precipitation process.


H. C. Liang, PhD/ Senior Engineer/Water Chemistry and Process Technical Lead/ Tetra Tech, Inc./

Your "create a new account" function either doesn't work or is difficult to use - as I can't figure it out.

Thank you, Carl E. Zipper Virginia Polytechnic Institute and State University Blacksburg VA 24060 USA

Text in section (Reducing and Alkalinity Producing System Wetlands) is incorrect and should be changed.

First sentence, second paragraph reads: "This type of system was first implemented at the Howe Bridge site in NW Pennsylvania and was initially referred to as a successive alkalinity-producing system (SAPS); the name indicated that more than one of these units could be used in series to treat very highly acidic water (Kepler and McCleary, 1994)."

Text should be changed to read:

"This type of system was first implemented at Galax, Virginia, in the late 1980s to treat highly acidic, high iron water emerging from an abandoned pyrite mine (Hendricks 1991). In 1991, a second system of this type was constructed to treat water being discharged by a coal processing waste landfill near Norton Virginia (Duddleston et al. 1992). The term "successive alkalinity producing system (SAPS)", indicating that more than one of these units could be used in series to treat very highly acidic water, was applied to these systems by Kepler and McCleary (1994), who demonstrated a successful application at the owe Bridge site in NW Pennsylvania. The Kepler and McLeary application received widespread notice, and use of these systems expanded rapidly thereafter."


Hendricks, A. C. 1991. The use of an Artificial Wetland to Treat Acid Mine Drainage. In Proceedings of the International Conference on the Abatement of Acidic Drainage. Montreal, Canada. September 1991.

Duddleston, K.N. E. Fritz, A.C. Hendricks, and K. Roddenberry. 1992. Anoxic cattail wetland for treatment of water associated with coal mining activities. p. 249-254, In: Proceedings, 1992 National Meeting of the American Society for Surface Mining and Reclamation.

In Section Concluding Comments on Passive Treatment the sentence "ALDs can effectively treat net acidic mine water with a pH above 5.0" is in error. It should read "...a pH below 5.0".