All Presentations (pdf)

8:15 Brent Means
10:10 James J. Gusek
12:40 Jonathan M. Dietz
2:15 Kimberly R. Weaver
4:00 Brent Means

8:45 Robert Kleinmann
9:15 Brent Means
9:30 James J. Gusek
10:00 Glenn C. Miller
10:30 Linda Ann Figueroa
12:40 Art Rose
1:10 Charles A. Cravotta III
1:40 Danielle M C Huminicki
2:50 Bernard Aube
3:20 Timothy K. Tsukamoto
3:50 Bradley R. Shultz
4:20 Kimberly R. Weaver


8:00 Linda Ann Figueroa
8:30 John Senko
9:00 Song Jin
10:10 Jonathan M. Dietz
10:40 Daryle H. Fish
12:40 John Chermak
1:10 Griff Wyatt
1:40 Dan Mueller
2:50 Sean C. Muller
3:20 Jack Adams
3:50 Roger Bason
3:50 Mark B. Carew

8:00 Rep. John E. Peterson
8:30 Scott Sibley
9:00 Charles A. Cravotta III
9:30 Michael R. Silsbee
10:30 Lykourgos Iordanidis
11:00 Mark Conedera
11:30 Barry Scheetz
1:25 William Benusa
1:55 Mike Sawayda
2:25 Susan J. Tewalt
3:25 Robert S. Hedin
3:55 Chad J. Penn

4:25 Ron Neufeld

Tuesday 12:40 Dr. Art Rose, Professor Emeritus of Geochemistry, Pennsylvania State University

Long-Term Performance of Vertical Flow Ponds


Arthur W. Rose, Ph.D.
Professor Emeritus of Geochemistry
Penn State University
409 Deike Building
University Park, PA 16802



Increasingly, it is recognized that many vertical flow ponds (SAPS) are not performing up to expectations over the long term. This paper extends the data on performance and problems previously presented, with the addition of new sites and updated information.

Of 39 sites, about half are performing satisfactorily. Four sites have essentially ceased to treat. Most of the remainder are treating at a moderate level, but not up to original expectations. Problems are overflow because of plugging by Fe precipitate on top of compost or by Al precipitate in limestone, leakage, decreased treatment because of short circuiting or Al coating, or inadequate size for the acidity loading. Several systems have been rebuilt at low cost and are performing satisfactorily. Areal loading of Fe and Al is an additional design parameter that should be considered.



Arthur W. Rose is Professor Emeritus of Geochemistry at Penn State University. He holds a PhD in Geology and Geochemistry From California Institute of Technology. After jobs for Kennecott Copper Co and the State of Alaska, he taught economic geology and applied Geochemistry at Penn State for 29 years. Starting in 1990, he supervised a number of theses and research projects on acid mine drainage prevention and passive treatment. In recent years he has presented numerous papers on passive treatment methods, and continues research in this area. He is active as Technical Chair with the Clearfield Creek Watershed Association, and is currently supervising construction of two vertical flow systems.