我国主要城市群建筑垃圾区域性污染风险分析

REGIONAL ENVIRONMENTAL POLLUTION RISK ANALYSIS OF CONSTRUCTION WASTE IN MAJOR URBAN CLUSTERS IN CHINA

针对目前我国建筑垃圾环境风险评价缺乏系统性及对于区域环境化学背景值的忽视,联合富集因子法与地球化学背景值,综合考虑环境化学背景、区域类别、城市群发展、元素特征4个方面因素,并以京津冀、黄淮河、长三角、长株潭4大城市群为例,分别对5类建筑垃圾,8种不同重金属元素进行环境污染风险分析。结果表明:1)建筑垃圾中重金属元素污染与城市群发展过程密切相关;2)不同重金属元素的富集情况具有地域性差异且受地球化学背景值的影响;3)建筑材料生产过程中的重金属引入对建筑垃圾重金属元素总量有直接影响。

In response to the lack of systematic environmental risk assessment of construction waste in China and the neglection of regional environmental chemical background values,the enrichment factor method,combined with geochemical background values,selecting four factors including environmental chemical background,regional categories,urban cluster development,elemental characteristics and four major urban clusters,including Beijing-Tianjin-Hebei,Huang-Huai-Huai River,Yangtze River Delta and Chang-Zhu-Tan,as the examples,five types of construction waste,the environmental pollution risk analysis was carried out on five types of construction waste and eight heavy metal elements.The results showed that:1)the pollution of heavy metal elements in construction waste was closely related to the development process of urban agglomerations;2)the enrichment of different heavy metal elements was regional and influenced by the geochemical background values;3)the introduction of heavy metals in the production process of construction materials had a direct impact on the total content of heavy metal elements in construction waste.