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| 大型溞投放密度对湖库水体水质改善及底泥污染物影响 | |
| 引用本文： | 杨东翰, 张立秋, 刘永泽, 曲丹, 邱斌, 李鹏飞, 郭鹏, 封莉. 大型溞投放密度对湖库水体水质改善及底泥污染物影响[J]. 环境工程学报, 2021, 15(8): 2831-2838. doi: 10.12030/j.cjee.202011015 |
| 作者姓名： | 杨东翰 张立秋 刘永泽 曲丹 邱斌 李鹏飞 郭鹏 封莉 |
| 作者单位： | 1.北京市水体污染源控制技术重点实验室，北京 100083; 2.北京林业大学环境科学与工程学院，北京 100083; 3.北京市北运河管理委员会昌平区管理段，北京 102206; 4.北京市昌平区沙河闸管理处，北京 102206 |
| 基金项目： | 水体污染控制与治理科技重大专项 |
| 摘 要： |  向北京市沙河水库投放大型溞(Daphnia magna)，利用其摄食藻类、促进悬浮颗粒态污染物沉降的特性，以提升水体的透明度，为后续沉水植物群落的恢复创造条件，并探索大型溞的投放密度，以及投放后对水质及底泥主要污染物的影响。结果表明：向沙河水库投加大型溞的最佳密度为5~15 ind·L−1；在该条件下，水体透明度可在3~5 d由40 cm提升至100 cm，浊度由19.7 NTU降至3 NTU，藻密度由2.4×106 cell·mL−1降至(4~6)×104 cell·mL−1；大型溞可在沙河水库长期存活，并可长期抑制藻类、维持水体的透明度；水体COD并未发生明显改变；大型溞的分泌物促进了悬浮颗粒态氮、磷的沉降，使TN和TP的去除率分别达到70.2%和54.9%；由于投溞后藻类浓度迅速下降，藻对NH3-N的吸收量降低，使水体NH3-N升高了32.2%；底泥中有机质、TN、TP均出现了一定程度的升高。针对于湖库水体透明度低的问题，应投放适宜密度的大型溞，调整水质状态，并结合水中藻类、底泥污染物等条件，综合考虑有效改善水质的方法。 |
| 关 键 词： | 大型溞 投放密度 透明度提升 水质改善 底泥 |
| 收稿时间： | 2020-11-03 |
Effect of Daphnia magna density on water quality improvement and sediment pollutants in Lake and reservoir water |
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| YANG Donghan, ZHANG Liqiu, LIU Yongze, QU Dan, QIU Bin, LI Pengfei, GUO Peng, FENG Li. Effect of Daphnia magna density on water quality improvement and sediment pollutants in Lake and reservoir water[J]. Chinese Journal of Environmental Engineering, 2021, 15(8): 2831-2838. doi: 10.12030/j.cjee.202011015 | |
| Authors: | YANG Donghan ZHANG Liqiu LIU Yongze QU Dan QIU Bin LI Pengfei GUO Peng FENG Li |
| Affiliation: | 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. |
| Keywords: | Daphnia magna adding density transparency improvement water quality improvement sediment |
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