Application of POPs-contaminated soil in the cement industry with high pollutant destruction efficiency

摘要

China faces enormous and urgent remediation tasks of contaminated soil as a result of industrial enterprises' relocation,pesticide application,mining exploitation and hazardous industry waste landfills.Because China is in the early stage of brownfield remediation,many technologies,such as bioremediation,solvent and vapor extraction,are in the pilot scale process.All of them have a common disadvantage that they cannot meet the needs of the large field-scale remediation work in a short time.Therefore,co-processing by cement kilns is considered to be a competent alternative method within an integrated management method.In this paper,a real-scale co-processing project has been done with approximately 400,000 t of DDTs/HCHs-contaminated soil.The results demonstrated that the product was of high quality.Stack emissions complied with the Chinese standards.Particularly,PCDD/F emissions were far below 0.1 ng TEQ Nm-3.The Destruction and Removal Efficiency (DRE) and the Destruction Efficiency (DE) were better than 99.9999％ and 99.99％,respectively.