滇池污染底泥环保疏浚一期工程实施后环境效益评估

胡小贞<sup>1</sup>; $2<sup>1</sup>刘倩<sup>1</sup>; $2<sup>2</sup>

引用本文:	胡小贞金相灿刘倩李发荣.滇池污染底泥环保疏浚一期工程实施后环境效益评估[J].环境监控与预警,2010,2(4):46-49
	HU Xiao-zhen ,JIN Xiang-can ,LIU Qian ,LI Fa-rong.Study on Environmental Benefits of Environmental Dredging the First Phase Project in Lake Dianchi[J].Environmental Monitoring and Forewarning,2010,2(4):46-49

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滇池污染底泥环保疏浚一期工程实施后环境效益评估
胡小贞金相灿刘倩李发荣^1,2
1.中国环境科学研究院国家环境保护湖泊污染控制重点实验室,北京 100012;2.昆明市环境监测中心,云南昆明 650032

摘要:

通过对滇池草海污染底泥环保疏浚一期工程实施前后水质、底质及水生生物的监测和分析，评价工程实施后对改善草海水质，减轻内源负荷及对水生态恢复的环境效益。结果表明，疏浚工程直接去除了草海污染底泥层，随污染层分别去除TN、TP20538t和1716t。疏浚后草海水体透明度南0.37m提高到0.80m，水体中的TN和TP由疏挖前的8.91mg／L和1.07mg／L降低到疏挖后的8.15mg/L和0.69mg／L。疏浚后新生界面层促使形成新的水-沉积物的平衡，水质与底质条件改善以及水下光照条件超过沉水植物恢复的需求，

关键词: 滇池底泥环保疏浚环境效益评估

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基金项目:国家“十一五”水体污染控制与治理科技重大专项项目（2009ZX07106-005）,国家公益性行业科研专项项目（200909048）

Study on Environmental Benefits of Environmental Dredging the First Phase Project in Lake Dianchi

HU Xiao-zhen ,JIN Xiang-can ,LIU Qian ,LI Fa-rong^1,2

1. State Environmental Protection Key Laboratory for Lake Pollution Control, Research Center of Lake Environment, Chinese Research Academy of Environment Sciences, Beijing 100012, China;2. Kunming Environmental Monitoring Center, Kunming,Yunnan 650032, China

Abstract:

Based on monitoring and analysis of data of water quality, sediment and aquatic organism before and after the project, the environmental benefits of the Lake Dianehi Dredging the First Pahse Project were evaluated. The results showed that dredging directly removed the contaminated sediment layer of Caohai with simultaneously removal of pollutant TN and TP 20 538 t and 1 716 t respectively. After dredging, main water quality indexes such as TN and TP decreased fi＇om 8.91 mg/L to 8.15 mg/L and 1.07 mg/L to 0.69 mg/L respectively, which led to increase of water transparency from 0.37 m to 0.80 m. Formation of new interfacial layer after dredging forced starting new balance between water and sediment, which contributed to improvement of water quality. And the improvement of aquatic and sediment quality after dredging, especially increase of underwater light conditions, was the mechanism of restoration trend of aquatic ecosystems of Caobai.

Key words: Lake Dianchi sediment environmental dredging environmental benefits evaluation