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| Analysis of pond water retention time and retention capacity of nitrogen stratification |
| Received:April 04, 2022 Revised:May 25, 2022 |
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| KeyWord:pond;hydraulic retention;nitrogen retention;residence time distribution（RTD） ;TASCC method |
| Author Name | Affiliation | E-mail | | WEN Wen | Yangtze University, Wuhan 430000, China
Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China | | | ZHANG Mingyao | Yangtze University, Wuhan 430000, China
Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China | | | ZHONG Yonglin | Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China | | | GAO Xiufang | Yangtze University, Wuhan 430000, China | | | Lü Mingquan | Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China | lvmingquan@cigit.ac.cn | | WU Shengjun | Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China | |
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| Abstract: |
| To reveal the characteristics of water retention capacity and nitrogen retention at different pond depths, an experimental pond in Beibei District, Chongqing City was selected and the field pulse tracer experiment was carried out in winter. The residence time distribution was adopted to evaluate and analyze the hydraulic retention capacity. Characteristics of nitrate nitrogen retention capacity were analyzed by the additions of tracer additions TASCC method based on nutrient spiral principle . The concentration of nutrients in the bottom layer of the pond was higher than that in the upper layer, and the retention capacity of nutrients in the bottom layer was stronger than that in the upper layer. Most of the nitrogen entering the pond flowed slowly through the bottom and accumulated in the bottom of the pond with water flow. The remainder flowed away quickly from the upper layer, facilitating subsequent nitrogen removal. In the background concentration, the absorption rate of NO3--N background concentration of each layer depth varied from 2.50 to 9.13 μg·m-2·s-1, the absorption rate of NO3--N background concentration ranged from 0.12 to 0.40 m·s-1, the entire overlying water of the pond absorbed and transformed nitrogen, and the nitrogen trapped in the bottom layer was constantly exchanged between the overlying water and sediment to perform nitrification and denitrification, and reduce nitrogen pollution from the agricultural non-point sources. |
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