小型封闭景观水体应急修复技术研究

Small Enclosed Landscape Water Emergency Repair Engineering Research

良好的感官性状是景观水体的基本特征,封闭景观水体的水域面积小、环境容量低、水体自净能力差等特点决定了其易受到污染。目前针对该水体修复常用的技术手段多为换水及固定底泥。以师陶园内500 m2的封闭池塘为研究对象,对该水体实施换水及固定底泥的应急修复工程,通过监测修复前后的水质,分析其变化情况,评估该应急修复方法的经济性及持效性。结果发现修复10 d后,其水质得到明显改善,水质指标达GB38382-2002 IV类标准,表观污染等级由重污染转变为清洁,氨氮、磷酸盐、COD以及浊度由25、1.5、120、90 mg/L下降到2、0.1、40、5 mg/L,DO由0.5 mg/L上升到3.0 mg/L。该修复工程的费用为2.12元/m3,水质持效时间可达10个月左右。

Good apparent property is the essential characteristic of landscape water body. Closed landscape water body can be easily polluted due to its small area, small water environmental capacity and poor self-purification ability. Water change and sediment fixation are the regular remediation methods for this kind of water body. In this research, emergency remediation engineering was carried out including water change and sediment fixation in the 500 m^2 enclosed pond named Shitao Garden. Then the economicalefnciency and persistence of this engineering was evaluated through water quality variation monitoring and analysis. The results indicated that after the ten days remediation, the water quality was obviously improved and water quality parameters met the GB38382-2002 IV criterion. Apparent pollution level changed from serious polluted to clean with ammonia nitrogen,phosphate, COD and turbidity respectively decreasing from 25,1.5,120,90 mg/L to 2,0.1,40,5 mg/L, DO increasing from 0.5 mg/L to 3.0 mg/L. The cost of the remediation engineering was 2.12 yuan/m^3 ,and the water could maintain good state for ten months.