http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Yuanmei Chen,Yutang Xiao,Guanping Wang,Wei Shi,Linquan Sun,Yanfang Chen,Aichun Miao 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.4
In this pilot-scale test, the ozonation-biological treatment-catalytic ozonation system was performed to treat complex organics and highly-concentrated total nitrogen (TN) in biological pretreated incineration leachate. The test results showed that the ratio of five-day biochemical oxygen demand (BOD5) / chemical oxygen demand (COD) increased from 0.059 to 0.237, which indicated that the concentration of biodegradable COD (CODbio) increased by ozonation pre-treatment process. In addition, the TN removal mainly occurred in anaerobic zone due to direct denitrification by the activated bacteria, which were domesticated through different influent ratio. Moreover, it was necessary to add catalytic ozonation process to reach higher direct effluent discharge criteria. After 60 days repeated debugging, the removal rate of COD and TN reached 88.5% and 98.2%, respectively. Finally, the total cost of this system was ¥ 6.65 /㎥ ($ 0.95 /㎥), which was acceptable for the treatment of biological pretreated leachate. This pilot-scale test could provide some guiding information for the treatment of leachate containing highly-concentrated TN with low CODbio/N by the composite system.
Measurement of the radon and thoron exhalation rates from the water surface of Yixin lake
Jiulin Wu,Shuaibin Liu,Tao Hu,Fen Lin,Ruomei Xie,Shuai Yuan,Haibo Yi,Yixiang Mo,Jiale Sun,Linquan Cheng,Huiying Li,Zhipeng Liu,Zhongkai Fan,Yanliang Tan Korean Nuclear Society 2024 Nuclear Engineering and Technology Vol.56 No.4
The importance of determining the radon exhalation rate from water surface is emphasized by the increased use of radon and its daughter products as tracers in large-scale circulation studies of the atmosphere. There were many methods to measure radon exhalation from water surface. With the development of radon exhalation rate measurement methods and instruments on the surface of the soil, the rock and building materials, so the radon exhalation rate from water surface can be more accurately measured by applying these improved methods and instruments. In this paper, a cuboid accumulation chamber surrounded by foam boards and a RAD7 were used to measure the radon exhalation rate on the water surface at three different positions by Yixin lake. Each measurement was performed 2 h. The radon exhalation rate from the water surface was about 6 × 10<sup>-3</sup> Bq m<sup>-2</sup>s<sup>-1</sup>. The thoron exhalation rate from the water surface also can be estimated, it is about 0.16 Bq m<sup>-2</sup>s<sup>-1</sup>. These results hint that the radon transmission from the lake bottom soil to water and then into the atmosphere.