Batch versus continuous feeding strategies for pharmaceutical removal by subsurface flow constructed wetland

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• 作者：Dong Qing Zhang^a ; ^{dqzhang@ntu.edu.sg} ; Richard M. Gersberg^b ; ^{rgersber@mail.sdsu.edu} ; Junfei Zhu^a ; Tao Hua^a ; K.B.S.N. Jinadasa^c ; Soon Keat Tan^d ; ^{ctansk@ntu.edu.sg}
• 关键词：Batch (drain and fill) ; Continuous flow ; Pharmaceutical ; First-order kinetics ; Log Dow
• 刊名：Environmental Pollution
• 出版年：2012
• 期刊代码：28_02697491
• 类别：env
• 出版时间：August, 2012
• 卷：167
• 期：Complete
• 页码：124-131
• 文件大小：473 K

摘要

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聽cm聽day^鈭? and 2.8聽cm聽day^鈭?. Except for carbamazepine, clofibric acid and naproxen, removal in CWs was significantly (p聽<聽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聽<聽0.1) and inversely correlated with log D_ow value, but not with log K_ow value.