Effect of Daphnia magna density on water quality improvement and sediment pollutants in Lake and reservoir water
YANG Donghan1,2,, ZHANG Liqiu1,2, LIU Yongze1,2, QU Dan1,2, QIU Bin1,2, LI Pengfei3, GUO Peng4, FENG Li1,2,, 1.Beijing Key Laboratory for Source Control Technology of Water Pollution, Beijing 100083, China 2.College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China 3.Section of Changping District, Beijing Northern Canal Management Committee, Beijing 102206, China 4.Shahe Gate Management Office, Changping District, Beijing 102206, China
Abstract:To improve the transparency of the Beijing Shahe reservoir and create conditions for the recovery of submerged macrophytes, we added Daphnia magna in the reservoir water to enhance transparency by taking advantage of its characteristic of eating algae and promoting particle deposition. The density of added Daphnia magna and its effect on water and sediment quality were investigated. Results showed that the optimum density of Daphnia magna was 5~15 ind·L?1. At this density, the density of algae decreased from 2.4×106 to 4~6×104 cell·mL?1. The transparency increased from 40 to 100 cm, while the turbidity decreased from 19.7 to 3 NTU within 3~5 d. After the Daphnia magna releasing, the COD of water did not change significantly, while the removal efficiency of TN and TP was 70.2% and 54.9%, respectively. That is because Daphnia magna promoted the deposition of suspended particulate nitrogen and phosphorus. The concentration of NH3-N increased by 32.2%, mainly due to the rapid decrease of algal, which weakened its adsorption of NH3-N. The organic matter, TN and TP in the sediment increased after adding Daphnia magna.Therefore, the low transparency of lake and reservoir should be treated by adding appropriate density of Daphnia magna, and comprehensive measures need to be taken by considering the algae and sediment conditions in the reserviors. Key words:Daphnia magna/ adding density/ transparency improvement/ water quality improvement/ sediment.
图5不同投放密度下${\rm{NH}}_4^ + $、${\rm{NO}}_3^ - $-N、TN变化 Figure5.Variations of ${\rm{NH}}_4^ + $, ${\rm{NO}}_3^ - $-N and TN under different initial Daphnia magna delivery densities
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1.Beijing Key Laboratory for Source Control Technology of Water Pollution, Beijing 100083, China 2.College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China 3.Section of Changping District, Beijing Northern Canal Management Committee, Beijing 102206, China 4.Shahe Gate Management Office, Changping District, Beijing 102206, China Received Date: 2020-11-03 Accepted Date: 2020-12-14 Available Online: 2021-09-15 Keywords:Daphnia magna/ adding density/ transparency improvement/ water quality improvement/ sediment Abstract:To improve the transparency of the Beijing Shahe reservoir and create conditions for the recovery of submerged macrophytes, we added Daphnia magna in the reservoir water to enhance transparency by taking advantage of its characteristic of eating algae and promoting particle deposition. The density of added Daphnia magna and its effect on water and sediment quality were investigated. Results showed that the optimum density of Daphnia magna was 5~15 ind·L?1. At this density, the density of algae decreased from 2.4×106 to 4~6×104 cell·mL?1. The transparency increased from 40 to 100 cm, while the turbidity decreased from 19.7 to 3 NTU within 3~5 d. After the Daphnia magna releasing, the COD of water did not change significantly, while the removal efficiency of TN and TP was 70.2% and 54.9%, respectively. That is because Daphnia magna promoted the deposition of suspended particulate nitrogen and phosphorus. The concentration of NH3-N increased by 32.2%, mainly due to the rapid decrease of algal, which weakened its adsorption of NH3-N. The organic matter, TN and TP in the sediment increased after adding Daphnia magna.Therefore, the low transparency of lake and reservoir should be treated by adding appropriate density of Daphnia magna, and comprehensive measures need to be taken by considering the algae and sediment conditions in the reserviors.
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