China National Rice Research Institute, Hangzhou 310006, PR China; Laboratory of Quality & Safety Risk Assessment for Rice (Hangzhou), Ministry of Agriculture, Hangzhou 310006, China; Key Laboratory of the Three Gorges Reservoir Region's Eco-Environments of Ministry of Education, Chongqing University, Chongqing, PR China.
China National Rice Research Institute, Hangzhou 310006, PR China.
J Hazard Mater. 2016 Jan 15;301:566-75. doi: 10.1016/j.jhazmat.2015.08.057. Epub 2015 Nov 13.
This study investigated the effects of selected four pharmaceutically active compounds (PhACs) (carbamazepine, sulfamethoxazole, ofloxacin, and roxithromycin) on the photosynthesis and antioxidant enzymes of Cyperus alternifolius in constructed wetlands (CWs). Moreover, the removal and kinetics of PhACs in CWs were evaluated to explore the related removal mechanisms. Results showed that C. alternifolius can uptake and withstand certain PhACs. The PhAC tolerance of C. alternifolius might be attributed to their capacity to maintain relatively normal photosynthetic activity and elevated antioxidative defense. CWs offered comparable or even higher removal efficiencies for the selected PhACs compared with conventional WWTPs. The removal of the target PhACs was enhanced in the planted CWs versus the unplanted CWs mostly because of plant uptake and rhizosphere effects. In particular, carbamazepine, which is considered the most recalcitrant of the PhACs, was significantly reduced (p<0.05). The removal of target PhACs fitted into two distinct periods. The initial fast step (within the first 2 h) was essentially attributed to the adsorption onto the CW medium surface. The subsequent slow process (2-12 h) closely followed first-order kinetics probably because of the interaction between microorganisms and plants. The obtained results indicate that C. alternifolius can phytoremediate PhAC-contaminated waters in CWs.
本研究考察了四种药用活性化合物（PhACs）（卡马西平、磺胺甲恶唑、氧氟沙星和罗红霉素）对人工湿地（CWs）中香附子光合作用和抗氧化酶的影响。此外，还评估了 CWs 中 PhACs 的去除及其动力学，以探讨相关的去除机制。结果表明，香附子可以吸收并承受一定浓度的 PhACs。香附子对 PhACs 的耐受性可能归因于其维持相对正常光合作用和增强抗氧化防御的能力。与传统的污水处理厂相比，CWs 对所选 PhACs 的去除效率相当甚至更高。与无植物 CWs 相比，种植 CWs 对目标 PhACs 的去除得到了增强，主要是因为植物吸收和根际效应。特别是被认为最难去除的 PhACs 之一卡马西平，其含量显著降低（p<0.05）。目标 PhACs 的去除可分为两个明显的阶段。初始快速阶段（前 2 小时内）主要归因于吸附到 CW 介质表面。随后的缓慢过程（2-12 小时）可能是由于微生物和植物之间的相互作用，符合一级动力学。研究结果表明，香附子可在 CWs 中进行植物修复受 PhACs 污染的水。
