Life Cycle Evaluation Research Of Petroleum Contaminated Soil Remediation Technology

The comprehensive evaluation of soil remediation technology can provide scientific and effective theoretical guidance for the selection of remediation technology.At present,most of the existing evaluation indicators only investigate the related situation of the remediation technology within the boundary of the remediation site,but often ignore the analysis and evaluation of the life cycle,which to a certain extent increase the risk of making decisions about remediation technology.Based on the thinking of life cycle,the subject studies the comprehensive evaluation of remediation technology of petroleum contaminated soil,aiming to provide a comprehensive evaluation method and thinking for remediation workers.The main research contents are as follows:(1)Establishing an indicator system is the basis and premise for comprehensive evaluation.According to the relevant national standards and norms in the field of soil remediation,as well as relevant domestic and foreign documents on the evaluation of soil remediation technology,the subject selects life cycle evaluation indicators from a technical,economic,and environmental perspective,to establish a comprehensive evaluation indicator system of petroleum contaminated soil remediation technology based on life cycle thinking.(2)Constructing mathematical model is the support and guarantee for comprehensive evaluation.Combined with the indicator system,the subject constructs the mathematical model which needs to be applied in the comprehensive evaluation process of petroleum contaminated soil remediation technology.By constructing a mathematical analytic hierarchy model,the subject solves the problem of calculating indicators weights during the comprehensive evaluation of soil remediation technologies firstly,and establishes corresponding indicator scoring standards and synthetic function.At the same time,the subject uses MATLAB R2016 b software to program the life cycle impact assessment process of the remediation technology,which realizing the calculation of the remediation technology from pollutant emission inventory data to the secondary environmental impact value.(3)Based on a domestic petroleum contaminated soil remediation project of workstation as the practical application background,the subject takes the in-situ chemical oxidation technology and ex-situ thermal desorption technology which can meet the requirements of remediation project as alternative remediation technology,combined with the indicator system and the mathematical model,carrying out a comprehensive life cycle assessment study on the two remediation technologies.Through research and analysis,for the petroleum contaminated soil in the remediation project,the subject calculates the comprehensive evaluation values of in-situ chemical oxidation technology and ex-situ thermal desorption technology are 1.5738 and 1.4262,respectively.The results show that,based on the theoretical analysis of the life cycle of the remediation project,in-situ chemical oxidation technology is more suitable than the ex-situ thermal desorption technology for remediation of the petroleum contaminated soil.In the investigation of the secondary impact indicators of remediation technology,the subject uses life cycle assessment(LCA)as an evaluation tool,combining life cycle assessment and comprehensive evaluation of remediation technology to analyze the environmental impact of remediation technology.At the same time,the subject uses the method of economic input-output and the software developed by Carnegie Mellon University to calculate the impact of the manufacturing process of remediation technology equipment and facilities,which to a certain extent makes up for the truncation error of the calculation of environmental impact of remediation technology in the life cycle.