College of Civil Engineering, Shenzhen University, Shenzhen, 518060, China.
Macau Environmental Research Institute, Macau University of Science and Technology, Macau, China.
Environ Sci Pollut Res Int. 2018 May;25(14):13823-13832. doi: 10.1007/s11356-018-1632-z. Epub 2018 Mar 6.
Large quantities of construction and demolition (C&D) waste are generated in China every year, but their potential environmental impacts on the surrounding areas are rarely assessed. This study focuses on metals contained in C&D waste, characterizing the metal concentrations and their related environmental risks. C&D waste samples were collected in Shenzhen City, China, from building demolition sites, renovation areas undergoing refurbishment, landfill sites, and recycling companies (all located in Shenzhen city) that produce recycled aggregate, in order to identify pollution levels of the metals As, Cd, Cr, Cu, Pb, Ni, and Zn. The results showed that (1) the metal concentrations in most demolition and renovation waste samples were below the soil environmental quality standard for agricultural purposes (SQ-Agr.) in China; (2) Cd, Cu, and Zn led to relatively higher environmental risks than other metals, especially for Zn (DM5 tile sample, 360 mg/kg; R4 tile sample, 281 mg/kg); (3) non-inert C&D waste such as wall insulation and foamed plastic had high concentrations of As and Cd, so that these materials required special attention for sound waste management; and (4) C&D waste collected from landfill sites had higher concentrations of Cd and Cu than did waste collected from demolition and refurbishment sites.
中国每年产生大量的建筑和拆除（C&D）废物，但很少评估其对周围地区的潜在环境影响。本研究重点关注 C&D 废物中的金属，描述金属浓度及其相关的环境风险。从深圳市的建筑拆除现场、正在翻新的装修区域、垃圾填埋场和回收公司（均位于深圳市）收集 C&D 废物样品，以确定 As、Cd、Cr、Cu、Pb、Ni 和 Zn 等金属的污染水平。结果表明：（1）大多数拆除和翻新废物样品中的金属浓度低于中国农业用地土壤环境质量标准（SQ-Agr.）；（2）Cd、Cu 和 Zn 导致相对较高的环境风险，尤其是 Zn（DM5 瓷砖样品，360mg/kg；R4 瓷砖样品，281mg/kg）；（3）非惰性 C&D 废物，如墙体保温和泡沫塑料，含有高浓度的 As 和 Cd，因此这些材料需要特别注意进行合理的废物管理；（4）从垃圾填埋场收集的 C&D 废物中 Cd 和 Cu 的浓度高于从拆除和翻新现场收集的废物。
