北京市城市污泥土地利用的重金属污染风险评估  

Pollution Risk Assessment of Heavy Metals in Sewage Sludge for Land Application in Beijing

作　　者：李雅嫔 杨军[2] 雷梅[2] 陈同斌[2] 郑国砥[2] 刘树庆[1] 

机构地区：[1]河北农业大学资源与环境科学学院,河北保定071001 [2]中国科学院地理科学与资源研究所环境修复中心,北京100101

出　　处：《中国给水排水》2015年第9期117-120,共4页China Water & Wastewater

基　　金：环保公益性行业科研专项(201009015)

摘　　要：重金属污染风险是限制城市污泥土地利用的重要因素,通过调查北京市污泥施用区土壤、作物的重金属含量,评估北京市的城市污泥农用重金属污染风险,筛选北京市城市污泥土地利用优先控制重金属。与对照区相比,北京市城市污泥施用区表层土壤的Hg、Zn和Cu含量分别增加3 731%、86.3%和63.0%,累积趋势较明显。污泥施用区小麦籽粒的Zn含量显著高于对照区,As、Cd、Cr、Cu、Hg、Ni、Pb含量与对照区小麦籽粒的差异并不显著;污泥施用区小麦籽粒的Cu超标率为18.2%,高于对照区的。结合土壤重金属累积特征以及小麦籽粒重金属含量情况,北京市城市污泥土地利用Cu污染风险较大,优先控制的重金属是Cu,其次为Hg。The pollution risk of heavy metals is an important factor limiting the land application of sewage sludge. The contents of heavy metals in the soils and crops in sludge applied areas in Beijing were investigated to assess the pollution risk of heavy metals in sewage sludge for the agricultural application and select the heavy metals to he controlled in priority. Compared with the control area, the contents of Hg, Zn and Cu in the surface soils in the sludge applied areas showed obvious accumulation of_ heavy metals with increments of 3 731%, 86.3% and 63.0% respectively. The content of Zn in wheat seed in the sludge applied areas was significantly higher than that in the control area, while the contents of As, Cd, Cr, Cu, Hg, Ni and Pb showed no significant difference. The content of Cu in wheat seed in the sludge applied areas was higher than that in the control area, with an over-limit rate of 18.2%. The pol- lution risk of Cu was relatively higher according to the characteristics of heavy metal accumulation in soil and the analysis of heavy metal level in wheat seed, thus Cu should be controlled in priority, followed bythe Hg.

关 键 词：城市污泥 土地利用 重金属污染风险 

分 类 号：X703[环境科学与工程—环境工程] X820.4