Treatment of Drainage Water Containing Pharmaceuticals Using Duckweed (Lemna gibba)

摘要

The potential use of duckweed (Lemna gibba) system to remove pharmaceuticals from drainage water (DW) was investigated. The system achieved removal of 66.12±1.4%, 47.50±2.0% and 66.50±1.7% for 1000 μg/L of acetaminophen (ACT), diclofenac (DFC), and progesterone (PRG), respectively. The uptake rate (k_(r1)) of ACT, DFC, and PRG was significantly decreased from 0.884±0.12 to 0.199±0.02, from 0.528±0.02 to 0.152±0.01 and from 0.719±0.03 to 0.264±0.01 at increasing the initial concentration from 1 to 1000 ug/L, respectively. Moreover, the duckweed uptake contributed the major removal pathway followed by duckweed sorption and microbial degradation for ACT, DFC and PRG.