State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China.
State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China.
J Environ Manage. 2021 Dec 15;300:113798. doi: 10.1016/j.jenvman.2021.113798. Epub 2021 Sep 22.
The resuspension and sedimentation of particulate matter and the release of nutrients from sediment are important factors affecting the eutrophication of shallow lakes. The capture and removal of particles rich in nitrogen, phosphorus, and other nutrients at the bottom of lakes is of great significance for improving the management and eutrophication status of lakes. This study investigated the feasibility of applying lake bottom trap technology in seven different locations in Lake Chaohu, which is the fifth largest freshwater lake in China. The results showed that the trap in the western part of Lake Chaohu had the highest sedimentation rate and could capture most of the nutrients. The sedimentation rates were higher in spring and summer than in autumn and winter. The bottom trap effectively collected and preserved chlorophyll a, organic matter, total nitrogen, and total phosphorus. The trap per meter length (15-20 m wide) could catch 20.7-27.6 m of particles rich in nutrients with a water content of 50-70%, organic matter content of 281.9-375.8 kg, total nitrogen content of 24.5-32.6 kg, and total phosphorus content of 10.5-14 kg. The proposed bottom trap had little impact on the benthic organism system of the lake. The bottom trap technology used in this study could solve the problem of nitrogen, phosphorus, and algae accumulation in lakes and reservoirs, broaden the utility of lake hydrodynamics in environmental pollution control, and provide new ideas and strategies for the control and management of cumulative pollution in shallow lakes and reservoirs.
水体中颗粒物的再悬浮和沉降，以及底泥中营养盐的释放，是影响浅水湖泊富营养化的重要因素。湖泊底部富营养物质（如氮、磷等）颗粒的捕获和去除，对于改善湖泊管理和富营养化状况具有重要意义。本研究探讨了在我国第五大淡水湖——巢湖的七个不同位置应用湖底捕集技术的可行性。结果表明，巢湖西部的捕集器具有最高的沉降速率，可以捕获大部分营养物质。春季和夏季的沉降速率高于秋季和冬季。底栖捕集器有效地收集和保存了叶绿素 a、有机物、总氮和总磷。每米长度（15-20 米宽）的捕集器可以捕获 20.7-27.6 米长、含水量为 50-70%、有机物含量为 281.9-375.8 千克、总氮含量为 24.5-32.6 千克、总磷含量为 10.5-14 千克的富营养物质颗粒。所提出的底栖捕集器对湖泊底栖生物系统的影响很小。本研究中应用的底栖捕集技术可以解决湖泊和水库中氮、磷和藻类积累的问题，拓宽湖泊水动力在环境污染控制中的应用，为浅水湖泊和水库的累积污染控制和管理提供新的思路和策略。
