Song Hai-Liang, Nakano Kazunori, Taniguchi Takashi, Nomura Munehiro, Nishimura Osamu
Graduate School of Engineering, Tohoku University, Aoba 6-6-06, Sendai 980-8579, Japan.
Bioresour Technol. 2009 Jun;100(12):2945-51. doi: 10.1016/j.biortech.2009.01.045. Epub 2009 Feb 28.
The presence of estrone (E1), 17 beta-estradiol (E2) and 17 alpha-ethynylestradiol (EE2) in sewage treatment work (STW) effluent pose a potential risk to aquatic ecosystem. The objectives of this study were to evaluate the effectiveness of vertical-flow wetland as polishing step of conventional wastewater treatment in the removal of estrogens and to examine the effect of sand depth. The highest removal efficiency of 67.8+/-28.0%, 84.0+/-15.4% and 75.3+/-17.6% for E1, E2 and EE2, respectively, was achieved by the shallowest wetland among three constructed wetlands with different filter layer depth (i.e. 7.5, 30 and 60 cm). Together with the result that the performance of wetlands when operating in unsaturated condition was superior to that when operating in water-saturated condition, it is suggested that maintaining sufficient aerobic circumstance in constructed wetlands was important for estrogens removal. Core sampling indicated that the highest efficiency achieved in extremely shallow wetland might be due partly to the highest root density, besides the superior condition for penetration of oxygen. The adsorbed estrogens in sand accounted for less than 12% of the removed estrogens irrespective of the depth, indicating biotic processes play a major role in the estrogens removal.
污水处理厂（STW）排放水中存在的雌酮（E1）、17β - 雌二醇（E2）和17α - 乙炔基雌二醇（EE2）对水生生态系统构成潜在风险。本研究的目的是评估垂直流湿地作为传统污水处理的抛光步骤在去除雌激素方面的有效性，并研究砂层深度的影响。在三个具有不同过滤层深度（即7.5、30和60厘米）的人工湿地中，最浅的湿地对E1、E2和EE2的去除效率最高，分别达到67.8±28.0%、84.0±15.4%和75.3±17.6%。结合人工湿地在非饱和条件下运行时的性能优于在水饱和条件下运行的结果，表明在人工湿地中维持充足的好氧环境对于去除雌激素很重要。岩心取样表明，极浅湿地中实现的最高效率可能部分归因于最高的根系密度，以及氧气渗透的优越条件。无论深度如何，砂中吸附的雌激素占去除雌激素的比例不到12%，这表明生物过程在雌激素去除中起主要作用。
