污染场地修复技术方案筛选中环境指标建立初探:以某废弃焦化厂为例

我国污染场地的环境管理框架尚不健全,修复技术研发及筛选过程中对修复产生的“二次污染”认识往往不足.基于绿色可持续原则,从污染物排放、环境敏感程度、环境风险、土壤及生态环境、法律法规及标准、社会可接受程度等方面探讨环境指标的构建,并以北京某废弃焦化厂土壤修复方案筛选为例,进行了2项方案的环境比选.结果 表明:原位热脱附温...

ESTABLISHMENT OF THE ENVIRONMENTAL INDEXES IN SELECTION OF REMEDIATION SCHEMES: A CASE STUDY OF AN ABANDONED COKING SITE

The environmental management framework of contaminated sites is not completed in China, and there is often lack of clear understanding about environmental impacts in the process of remediation technology development or program selection. As a result, sometimes secondary pollution caused by remediation is ignored. The research established the environmental indexes including pollutant discharge, environmental sensitivity, environmental risk, soil and ecological environment, laws, regulations and standards, and social acceptability based on green and sustainable principle. The environmental comparison between two remediation technologies was carried out at an abandoned coking site in Beijing. The result showed that the emission of CO₂ and organized atmospheric pollutants of thermal desorption in situ were 6.0, 1.49 times larger than that of ex-situ thermal desorption, since the latter had advantages in energy saving and emission reduction. While the indexes such as environmental risk, sensitivity and social acceptance of in-situ thermal desorption were better and the in-situ program was chosen as the preferred plan. How to reduce emission of pollutants and lower environmental risks further was the key point to improve the two programs respectively. The index system could be used for screening or optimizing the remediation schemes by identifying critical environmental factors.