文章基本信息

标题：Sewage sludge as barrier material for heavy metals in waste landfill
本地全文：下载
作者：Huyuan Zhang ; Bo Yang ; Guangwei Zhang 等
期刊名称：Archives of Environmental Protection
印刷版ISSN：2083-4772
电子版ISSN：2083-4810
出版年度：2016
卷号：42
期号：2
页码：52-58
DOI：10.1515/aep-2016-0020
语种：English
出版社：Walter de Gruyter GmbH
摘要：Heavy metal pollutants in the leachate of waste landfill are a potential threat to the environment. In this study, the feasibility of using municipal sewage sludge as barrier material for the containment of heavy metal pollutants from solid waste landfills was evaluated by compaction test and hydraulic conductivity test concerning compaction property, impermeability and heavy metal retardation. Results of the compaction test showed that the maximum dry density of 0.79 g·cm⁻³ was achieved at the optimum water content of about 60%. The hydraulic conductivities of compacted sewage sludge permeated with synthetic heavy metal solutions were in the range of 1.3×10⁻⁸ – 6.2×10⁻⁹ cm·s⁻¹, less than 1.0 ×10⁻⁷cm·s⁻¹ recommended by regulations for barrier materials. Chemical analyses on the effluent from the hydraulic conductivity tests indicated that the two target heavy metals, Zn and Cd in the permeants were all retarded by compacted sewage sludge, which might be attributed to the precipitation and adsorption of heavy metal ions. The results of this study suggest that specially prepared material from sewage sludge could be used as a barrier for waste landfills for its low permeability and strong retardation to heavy metal pollutants.
关键词：sewage sludge ; hydraulic conductivity ; heavy metal pollution ; heavy metal retardation