Journal
ENVIRONMENTAL POLLUTION
Volume 167, Issue -, Pages 124-131Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2012.04.004
Keywords
Batch (drain and fill); Continuous flow; Pharmaceutical; First-order kinetics; Log D-ow
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Funding
- Maritime Research Centre (MRC)
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This study evaluated the effect of continuous and batch feeding on the removal of 8 pharmaceuticals (carbamazepine, naproxen, diclofenac, ibuprofen, caffeine, salicylic acid, ketoprofen and clofibric acid) from synthetic wastewater in mesocosm-scale constructed wetlands (CWs). Both loading modes were operated at hydraulic application rates of 5.6 cm day(-1) and 2.8 cm day(-1). Except for carbamazepine, clofibric acid and naproxen, removal in CWs was significantly (p < 0.05) enhanced under the batch versus continuous mode. For all compounds tested except naproxen, values for first-order decay constants (k) for drain and fill operation were higher than that for the continuous mode of operation. Correlation between the distribution coefficient (log D-ow) and removal efficiencies of pharmaceutical compounds in the CWs, showed that pharmaceutical removal efficiency was significantly (p < 0.1) and inversely correlated with log D-ow value, but not with log K-ow value. (C) 2012 Elsevier Ltd. All rights reserved.
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