AI Article Synopsis
- The study examined how continuous and batch feeding methods affect the removal of 8 pharmaceuticals from synthetic wastewater in constructed wetlands.
- Batch feeding generally performed better than continuous feeding for most of the compounds tested, showing significant removal improvements.
- There was a significant correlation between the distribution coefficient and the removal efficiency of these pharmaceuticals, indicating that certain chemical properties influence how well they are eliminated in these systems.
Article Abstract
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.
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| http://dx.doi.org/10.1016/j.envpol.2012.04.004 | DOI Listing |
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