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)