The behavior of selected chlorinated organic micropollutants in the activated sludge process: A pilot plant study |
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Authors: | R. S. K. Buisson P. W. W. Kirk J. N. Lestera |
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Affiliation: | 1. Department of Environmental Biology, University of Guelph, N1 G 2W1, Guelph, Ontario, Canada
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Abstract: | The effects of Cu(II) sulfate on sediment respiration were investigated in a 3-phase aquatic microcosm, containing a calcareous, southern Ontario stream sediment. In Cu2+ treated flask-microcosms, with the pH restored to 7.1, both aerobic and anaerobic CO2 evolution were unaffected by 5000 jig Cu g?1 sediment over a 40-day period at 15 °C. Oxygen consumption in sediment was initially unaffected by 5000 μg Cu g?1. However, after 35 to 40 days, a significant reduction of 28% was observed. The added Cu?2+ was removed from the water column and the sediment solution. In microcosms containing 5000 μg g?1 of total Cu, only 1.00 ± 0.76 μg g?1 was water soluble Cu, and the free cupric cation (Cu2+) concentration was below the detection limit of the specific ion electrode (less than 0.01 μg g?1). Maximum Cu retention (98.6%) was observed at 2800 μg Cu g?1, above which fractional retention decreased. In a calcareous, organic rich, sediment of pH 7.1, Cu+ was essentially unvailable to exert a toxic effect on respiration. |
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