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<p>Since the 1980s, Xuanwu Lake in Nanjing, China, has experienced eutrophication. Some restoration measures were implemented in Xuanwu Lake to control water eutrophication, including sediment dredging, algal bloom control through clay flocculation, and the promotion of aquatic macrophyte growth. This study aims to compare the water quality improvement levels achieved by various restoration measures. The water quality parameters, including dissolved oxygen concentration, total nitrogen, ammonia nitrogen, total phosphorus, permanganate index, etc., were monitored before and after implementing these measures. The results showed that the sediment was not the primary pollution source of the water body, the dredging did not change the nutrient contents in the lake significantly, and the heavy metal content in the sediment also did not decrease significantly. The water quality improved with increased water diversion, but improved less when it exceeded a certain level. Considering the comprehensive water quality and the cost of water diversion, it is recommended to divert 18 × 10<sup>4</sup> m<sup>3</sup> of water per day. Clay flocculation effectively inhibited cyanobacterial blooms within a short time, improved water quality, and promoted the restoration of the <i>Potamogeton crispu</i>s population. Aquatic population restoration is a sustainable and effective approach for Xuanwu Lake and controlling water eutrophication, water quality was improved distinctly during the growing period of the <i>P. crispus</i> population, compared to when aquatic vegetation was minimal. Partial harvesting of hygrophytes at the appropriate time will improve water quality. Therefore, in the management of eutrophic lakes, the method of dredging sediment should be carefully selected because it does not have a significant impact on improving water quality. Water diversion can improve water quality, but the amount of water diverted should be controlled at an appropriate level. Clay flocculation is an effective method for controlling algal blooms in emergency situations. The restoration of aquatic macrophytes is an effective way to maintain the health of aquatic ecosystems, and partial harvesting at the appropriate time will significantly improve water quality.</p>

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Water Quality of Xuanwu Lake, China, After Restoration

  • 期刊论文

  • 发表日期：

    2025年2月5日

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  • Jinqi Wang,
  • Yuzhi Song

摘要

Since the 1980s, Xuanwu Lake in Nanjing, China, has experienced eutrophication. Some restoration measures were implemented in Xuanwu Lake to control water eutrophication, including sediment dredging, algal bloom control through clay flocculation, and the promotion of aquatic macrophyte growth. This study aims to compare the water quality improvement levels achieved by various restoration measures. The water quality parameters, including dissolved oxygen concentration, total nitrogen, ammonia nitrogen, total phosphorus, permanganate index, etc., were monitored before and after implementing these measures. The results showed that the sediment was not the primary pollution source of the water body, the dredging did not change the nutrient contents in the lake significantly, and the heavy metal content in the sediment also did not decrease significantly. The water quality improved with increased water diversion, but improved less when it exceeded a certain level. Considering the comprehensive water quality and the cost of water diversion, it is recommended to divert 18 × 104 m3 of water per day. Clay flocculation effectively inhibited cyanobacterial blooms within a short time, improved water quality, and promoted the restoration of the Potamogeton crispus population. Aquatic population restoration is a sustainable and effective approach for Xuanwu Lake and controlling water eutrophication, water quality was improved distinctly during the growing period of the P. crispus population, compared to when aquatic vegetation was minimal. Partial harvesting of hygrophytes at the appropriate time will improve water quality. Therefore, in the management of eutrophic lakes, the method of dredging sediment should be carefully selected because it does not have a significant impact on improving water quality. Water diversion can improve water quality, but the amount of water diverted should be controlled at an appropriate level. Clay flocculation is an effective method for controlling algal blooms in emergency situations. The restoration of aquatic macrophytes is an effective way to maintain the health of aquatic ecosystems, and partial harvesting at the appropriate time will significantly improve water quality.