Pharmaceuticals Concentrations in TreatedWastewater in Rural Sewerage and Dynamics of Pharmaceuticals in Paddy Field Irrigated with Treated Wastewater

本研究认为，农村污水处理厂具有较高的药物去除能力，尤其是采用活性污泥法的处理厂。实际农村污水处理厂处理后的废水中检测到多种药物，但浓度均未超过水生生态系统的临界水平。然而，在这项研究中测量的15种药物中，酮洛芬（非甾体抗炎药）的风险最高。经处理后的废水灌溉的稻田对包括酮洛芬在内的15种药物几乎都有净化作用。在田间试验中，未观察到药物在水稻土中随时间的积累和药物向水稻可食部位的迁移。这些结果表明，无稀释再生水灌溉水稻是一种有价值的技术，对污水处理厂周围的水生态系统的环境保护。

In this research, it was suggested that the rural sewerage treatment plants have high removal function of pharmaceuticals, especially for the plants employing the activated sludge process. While the various kinds of pharmaceuticals were detected in the treated wastewaters in the actual rural sewerage treatment plants, the concentrations were not over the critical level for aquatic ecosystem. Ketoprofen (nonsteroidal anti-inflammatory drug) had the highest risk, however, in 15 pharmaceuticals measured in this research. The paddy field which irrigated with treated wastewater had the purification function for the almost all of the 15 pharmaceuticals including Ketoprofen. In the investigated field, the pharmaceuticals accumulation with time in paddy soil and the pharmaceuticals movement to the edible parts of rice plant were not observed. These results suggest that the non-diluted reclaimed wastewater irrigation for paddy is valuable technique for environmental protection for aquatic ecosystem surrounding wastewater treatment plants.