深圳荔枝湖富营养化综合治理工程效果研究

分析和比较了深圳荔枝湖综合治理工程运行9个月内不同湖区水体的叶绿素a、总磷、总氮及透明度的变化,探讨了综合治理工程对城市富营养化湖泊荔枝湖的水质改善情况.结果表明,治理工程运行期间全湖湖水营养水平控制在较低水平(总磷＜0.1 mg·L-1,总氮＜1.5 mg·L-1),四湖区藻类水平北湖区(16.77μg·L-1)和东湖区(21.45μg·L-1)较低,南湖区(35.83μg·L-1)、西湖区(32.69μg·L-1)相对较高,全湖水体透明度提高(全湖平均＞0.5 m);治理工程将湖水水质由劣Ⅴ类改善为Ⅳ类,由重富营养化水平改善为富营养化水平.

Treatment Effect of Eutrophication Restoration Project for Lichee Lake in Shenzhen

Based on 9-month monitoring field data, this paper analyzes the variation of chlorophyll-a (Chl-a), total phosphorus (TP), total nitrogen (TN) and transparency (SD) in different sub-lake districts in order to study the treatment effect of eutrophication restoration project in Lichee Lake in Shenzhen. The statistical results show that, the average of TP and TN for whole lake were below 0.1 mg x L(-1) and 1.5 mg x L(-1) respectively, the average of Chl-a of north lake district and east lake district were 16.77 microg x L(-1) and 21.45 microg x L(-1) respectively, lower than that of south lake district (35.83 microg x L(-1) and west lake district (32.69 microg x L(-1)), and the average of SD for whole lake was greater than 0.5 m. During the 9-month operation of the restoration project, the average water quality satisfied the National Standard IV for surface water and the water was improved from hypereutrophic status to eutrophic status in Lake.