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

被引:78
作者
Zhang, Dong Qing [1 ]
Gersberg, Richard M. [2 ]
Zhu, Junfei [1 ]
Hua, Tao [1 ]
Jinadasa, K. B. S. N. [3 ]
Tan, Soon Keat [4 ]
机构
[1] Nanyang Technol Univ, DHI NTU Ctr, Nanyang Environm & Water Res Inst, Singapore 639798, Singapore
[2] San Diego State Univ, Grad Sch Publ Hlth, San Diego, CA 92182 USA
[3] Univ Peradeniya, Dept Civil Engn, Peradeniya 20400, Sri Lanka
[4] Nanyang Technol Univ, Maritime Res Ctr, Sch Civil & Environm Engn, Singapore 639798, Singapore
关键词
Batch (drain and fill); Continuous flow; Pharmaceutical; First-order kinetics; Log D-ow; PERSONAL CARE PRODUCTS; WASTE-WATER TREATMENT; CLOFIBRIC ACID; PERFORMANCE; IBUPROFEN; PLANT; FATE; CARBAMAZEPINE; DEGRADATION; METABOLITES;
D O I
10.1016/j.envpol.2012.04.004
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
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 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.
引用
收藏
页码:124 / 131
页数:8
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