摘要
梁塘河作为城市河道,其底泥的主要污染物为营养物质和重金属.营养物质中全磷的含量较为丰富,达到了二级营养水平;重金属中铜的污染程度最大,其次为铬、镉和铅.根据污染物垂直分布分析,其含量普遍在20～40cm泥层最高,在40～60cm泥层最低,因此最佳清淤深度为50cm左右.针对清淤后的底泥,从可行性和经济性两个方面分析各种底泥资源化利用方法,认为直接施用于城市公园建设和湖滨带修复是梁塘河底泥方便可行、成本低廉的资源化利用手段,且满足城市可持续发展的需求.
Liangtang River,as a city stream channel,the main pollutants of its sediment are nutrient substance and heavy metals.Total phosphorous is relatively rich,which reaches the second trophic level.Among heavy metals,copper is the primary pollutant,followed by chromium,cadmium and lead.According to the pollutant vertical distribution analysis,the concentration of pollution is highest in the 20 ～ 40cm sediment layer,and lowest in the 40 ～60cm sediment layer,so the optimal dredging depth is around 50cm.After desilting,from the aspects of feasibility and economy,the sediment of Liangtang river is better used in the city park construction and the littoral zone renovation compared to other existing resource utilization methods.It is a convenient,feasible and low cost resource utilization method,and meets the require of urban sustainable development.
出处
《四川环境》
2016年第3期62-66,共5页
Sichuan Environment
基金
国家水体污染控制与治理科技重大专项
太湖新城湖滨流域水质改善与生态修复综合示范课题
重污染河流小流域水质改善技术与工程示范子课题(2012ZX07101-013-02)
关键词
梁塘河
底泥
污染特征
资源化利用
Liangtang river
sediment
pollution characteristic
resource utilization
