He Yang, Chi Jie
a School of Resources and Environmental Engineering , Ludong University , Yantai , People's Republic of China.
b School of Environmental Science and Engineering , Tianjin University , Tianjin , People's Republic of China.
Environ Technol. 2019 Feb;40(5):605-613. doi: 10.1080/09593330.2017.1398783. Epub 2017 Nov 9.
The results of phytoremediation of sediments contaminated with polycyclic aromatic hydrocarbons (PAHs) by two submerged aquatic plants (Vallisneria spiralis and Hydrilla verticillata) at pilot scale were reported for the first time in this study. During a 108-day period, the plants grew well, and more PAHs were dissipated in planted sediments than in unplanted sediments. At the end, dissipation ratios of phenanthrene and pyrene were 85.9% and 79.1% in sediments planted with V. spiralis, 76.3% and 64.6% in sediments planted with H. verticillata, but only 64.8% and 55.8% in unplanted sediments. V. spiralis exhibited higher phytoremediation ability, which was significantly related to its root oxygenation as indicated by the redox potential in sediments. The remediation results at pilot scale were also compared with those previously obtained in our laboratory. The ratio of root weight to sediment weight showed a similar trend to PAH dissipation enhancement. Bioconcentration factors of PAHs in the two plants were larger in the pilot experiment than in the laboratory tests as a result of quicker increase of plant weight in the pilot experiment.
本研究首次报道了两种沉水水生植物（螺旋藻和黑藻）对多环芳烃（PAHs）污染沉积物进行中试规模植物修复的结果。在108天的时间里，植物生长良好，种植沉积物中消散的多环芳烃比未种植沉积物中的多。最后，种植螺旋藻的沉积物中菲和芘的消散率分别为85.9%和79.1%，种植黑藻的沉积物中分别为76.3%和64.6%，而未种植沉积物中仅为64.8%和55.8%。螺旋藻表现出较高的植物修复能力，这与沉积物中的氧化还原电位所表明的其根系氧合作用显著相关。中试规模的修复结果也与我们之前在实验室获得的结果进行了比较。根重与沉积物重量之比与多环芳烃消散增强呈现相似趋势。由于中试实验中植物重量增加更快，两种植物中多环芳烃的生物浓缩系数在中试实验中比实验室测试中更大。
