蒽污染土壤的原位臭氧氧化法修复

Remediation of Contaminated Soil with Anthracene by in-situ Ozonolysis Method

在气体流量为120mL·min-1、气相臭氧浓度为3.38mg·L-1的条件下,对蒽含量为100mg·kg-1的污染土壤进行臭氧化处理。土柱实验表明,土壤中蒽的去除率随通气时间的增加而增加,且同一时间内蒽在土柱中的分布较为均匀。当通气时间达到40min时,蒽的平均去除率可达到80.4%。以呼吸强度为指标,用密闭滴定法研究了反应前后污染物及其降解产物对微生物的影响。与处理前相比,经臭氧氧化后,微生物的呼吸强度明显增强,表明土壤中的蒽经臭氧氧化后更易于生物降解。

In the present study,ozone was empl oyed to remedy contaminated soil with anthracene at a flow rate of 120mL·min -1 and gaseous ozone concentration of 3.38mg ·L -1 .The column tests showed that anthra cene removal efficiency increased with the remediation time,and the spatial di stribution of anthracene in the colu mn changed little at the same remedia tion time.The average removal efficiency of anthracene re ached 80.4%after a 40minute treatme nt.The effects of anthracene and its degradation products on soil microorganism were investig ated using soil respiration method.The results showed that soil respira tion was enhanced greatly after ozone treatment,indicating t hat the ozonolysis products of anthr acene were easily biodegraded.