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Long-term Operation of a Permeable Reactive Barrier with Diffusive Exchange by Alex Schwarz; Norma Pérez is a Environmental Science article available to read on EtoBox.

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In this study, we evaluate the long term operation of a bench-scale reactor which simulates a permeable reactive barrier with sulfidic diffusive exchange (SDES PRB) to treat acid mine drainage (AMD), considering that treatment costs are very sensitive to the useful life for passive reactors. Its functioning was evaluated for a much longer period of 591 days compared to previous SDES PRB studies, with two influents simulating moderately and highly acid groundwater contaminated by AMD. First, we fed water amended with 200 mg/L Zn and 3300 mg/L SO at pH 4.9; and after, water with 450 mg/L Fe, 100 mg/L Zn, 10 mg/L Ni, 5 mg/L Cu and 3600 mg/L SO at pH 2.5. Biologically produced sulfide and alkalinity were enough to remove both metals and acidity (~99%) from the moderately acidic water, while with the highly acidic water, they resulted in significant removal of the metals reaching up to 87% and 79% of total Fe and Zn, respectively. Furthermore, no inhibitory effect was apparent, as the sulfate reduction rates in the two experiments did not vary significantly (averages close to 0.2 mol/m-d), despite the much higher acidity and metal load in the second case. Hence, the SDES PRB protected t

Who reads Long-term Operation of a Permeable Reactive Barrier with Diffusive Exchange?

Author

Alex Schwarz; Norma Pérez

Publisher

Elsevier BV

Published

2021

Language

EN

Field

Environmental Science (Physical Sciences)