| 城市富营养化湖泊综合治理——以武汉北太子湖为例 |
| Comprehensive Treatment of a Eutrophic Urban Lake: A Case Study of Wuhan Beitaizi Lake |
| 投稿时间：2020-04-30 修订日期：2021-06-04 |
| DOI：10.15928/j.1674-3075.202004300118 |
| 中文关键词:城市湖泊 富营养化 综合治理 北太子湖 |
| 英文关键词:urban lake eutrophication comprehensive treatment Beitaizi Lake |
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| 中文摘要: |
| 应用“污染源控制+水生态修复+水质提升”综合技术治理北太子湖，为城市富营养化湖泊的治理提供技术体系和示范。北太子湖规划蓝线水面面积52.6hm2，湖岸线长5km，平均水深1.8m，工程前水质整体为劣V类，治理目标是湖水水质达到地表水IV类。2018年3月-2019年2月，通过实施污水管网改造、初期雨水调蓄池修建、生态植草沟构建、污染底泥疏浚、湖体水生态系统构建、旁路人工湿地水体提标等工程措施，COD、TN、TP的去除率分别为58.14%、83.18%、90.91%；2019年6-8月水体COD、TN、TP连续3个月达到地表水IV类标准。建议在水生态修复工程完工后，投加一些生态环保型的水质净化剂，提升水体透明度，促进沉水植物快速生长繁殖。 |
| 英文摘要: |
| Beitaizi Lake is located in Wuhan City of Hubei Province, with a water catchment area of 3.72 km2, a shoreline of 5 km and the average water depth of 1.8 m. According to water quality monitoring results, the water quality of Beitaizi Lake was generally inferior to class V during 2012-2017 and is a typical eutrophication urban lake. To improve water quality, a comprehensive treatment project was conducted in Taizihu Lake from March 2018 to February 2019, with the treatment target of meeting the class IV standard (GB 3838-2002) for three consecutive months. The project integrated a series of key technologies, including sewage system renovation, construction of a rainwater storage tank and bioswales, contaminated sediment dredging, construction a bypass artificial wetland. The result was a comprehensive system that incorporated ‘pollution source control, aquatic ecosystem restoration and water body improvement’ to effectively remediate urban lake eutrophication. The TN, TP and COD were monitored at five monitoring points before (February 2018), during (March 2018-February 2019) and after (March-August 2019) the project was completed. In February 2018, the concentrations of TN, TP and COD in February 2018 were, respectively, 3.39, 0.66, and 41.35 mg/L. During the period of pollution abatement and ecological restoration (March-May), there was little improvement in water quality. However, as operation of the restoration project stabilized (June – October), the concentrations of TN, TP and COD decreased to 1.57, 0.36 and 32.03 mg/L and, after the artificial wetland was operational (November 2018-February 2019), the respective concentrations decreased continuously to 1.12, 0.15 and 21.19 mg/L. As expected with ecologically based treatment processes, water purification efficiency was affected by water temperature. From March to August 2019, TN, TP and COD decreased to 0.57, 0.06 and 17.31mg/L (reductions of 83.18%, 90.91% and 58.14%, compared with those in February 2018). From June to August 2019, COD, TN, and TP concentrations met the standard for surface water class IV (GB 3838-2002) and the lake treatment goal was achieved. While the project was successful, we recommend the addition of eco-environmental water purifiers to improve water transparency and promote the rapid growth and reproduction of submerged plants. |
| 汪尚朋,郭艳敏,万骥,周超群,欧雅菲.2021.城市富营养化湖泊综合治理——以武汉北太子湖为例[J].水生态学杂志,42(4):91-96. |
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