caa a22 4500 475812867 CHVBK 20180406123801.0 cr unu---uuuuu 170329e20000901xx s 000 0 eng 10.1007/BF02687260 doi (NATIONALLICENCE)springer-10.1007/BF02687260 Alkalinity generation and metals retention in a successive alkalinity producing system [Elektronische Daten] [Robert Nairn, Matthew Mercer] Alkalinity generation and metals retention were evaluated during the initial year of operation of a treatment wetland, consisting of four 185 m2 inseries cells comprised of alternating vertical-flow anaerobic substrate wetlands (VFs) and surface-flow aerobic settling ponds (SFs). The substrate in the VFs consists of spent mushroom substrate (SMS) and limestone gravel, supplemented with hydrated fly ash in a 20∶10∶1 ratio by volume. Approximately 15±4 L/min of acid mine drainage (AMD) from an abandoned underground coal mine in southeastern Oklahoma, USA, was directed to the system in October 1998 (mean influent water quality: 660 mg L−1 net acidity as CaCO3 eq., pH 3.4, 215 mg L−1 total Fe, 36 mg L−1 Al, 14 mg L−1 Mn, and 1000 mg L−1 SO4 −2). Flow through the first VF resulted in substantial increases in alkalinity, decreased metal concentrations and circumneutral pH. 258±84 mg L−1 of alkalinity was produced in the first VF by a combination of processes. Final discharge waters were net alkaline on all sampling dates (mean net alkalinity=136 mg L−1). Total Fe and Al concentrations decreased significantly from 216±45 to 44±28 mg L−1 and 36±6.9 to 1.29±4.4 mg L−1, respectively. Manganese concentrations did not change significantly in the first two cells, but decreased significantly in the second two cells. Mean acidity removal rates in the first VF (51 g m−2 day−1) were similar to those previously reported. Springer Verlag, 2000 Acid mine drainage nationallicence Oklahoma nationallicence passive treatment nationallicence water treatment nationallicence wetlands nationallicence Nairn Robert School of Civil Engineering and Environmental Science, The University of Oklahoma, 202 West Boyd Street Room 334, 73019, Norman, OK aut Mercer Matthew Oklahoma Conservation Commission, 2800 N. Lincoln Blvd. Suite 160, 73105, Oklahoma City, OK aut Mine Water and the Environment Springer-Verlag 19/2(2000-09-01), 124-133 1025-9112 19:2<124 2000 19 10230 https://doi.org/10.1007/BF02687260 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02687260 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Nairn Robert School of Civil Engineering and Environmental Science, The University of Oklahoma, 202 West Boyd Street Room 334, 73019, Norman, OK aut NATIONALLICENCE 700 1- Mercer Matthew Oklahoma Conservation Commission, 2800 N. Lincoln Blvd. Suite 160, 73105, Oklahoma City, OK aut NATIONALLICENCE 773 0- Mine Water and the Environment Springer-Verlag 19/2(2000-09-01), 124-133 1025-9112 19:2<124 2000 19 10230 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer