间接热脱附过程质量平衡研究

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摘要：回转式间接热脱附是一种高效、快速的污染土壤热修复技术。研究表明，加热温度为650 ℃，停留时间为40 min时，污染土壤修复可以达标。热脱附期间，苯并[a]芘和石油烃在处置前后介质中的质量不平衡。经分析，原因可能是苯并[a]芘和石油烃在处置过程中由于高温发生裂解转化。

关键词：间接热脱附；污染土壤；修复；质量不平衡；裂解转化

中图分类号：X53 文献标识码：A 文章编号：1008-9500（2023）08-00-03

DOI：10.3969/j.issn.1008-9500.2023.08.016

Study on Mass Balance of indirect Thermal Desorption Process

ZHANG Jicheng

（Zhongrun Wanlong （Chongqing） Environmental Protection Technology Co.， Ltd.， Chongqing 401121， China）

Abstract： Rotary indirect thermal desorption is an efficient and fast thermal remediation technology for contaminated

soil. Research has shown that when the heating temperature is 650 ℃ and the residence time is 40 min， the remediation of contaminated soil can meet the standards. During thermal desorption， there is an imbalance in the mass of benzo [a] pyrene and petroleum hydrocarbons in the medium before and after disposal. After analysis， the reason may be that benzo [a] pyrene and petroleum hydrocarbons undergo pyrolysis and transformation due to high temperature during the disposal process.

Keywords： indirect thermal desorption; contaminated soil; remediation; mass imbalance; pyrolysis and transformation

热脱附技术是通过直接或间接加热，将污染土壤加热至目标污染物的沸点以上，通过控制系统温度和物料停留时间有选择地促使污染物气化挥发，达到目标污染物与土壤颗粒分离、去除的目的[1]。（剩余2237字）