지중오존산화시 토양유기물질과 수분이 토착미생물의 생존과 재성장에 미치는 영향

This study was carried out to investigate the effect of soil properties, such as soil organic matter(SOM) content and water content on die-off and regrowth of indigenous microbes due to in-situ ozonation. Four different soils were collected and the soil samples applied to different ozonation time(0-360 min) were incubated during 4 weeks. Population of the indigenous microbes was monitored during incubation period. The number of indigenous microbes in all samples dramatically decreased (more than 90%) within 30 minutes of ozone injection. With increased ozonation time by 360 minutes, the number of the indigenous microbes decreased by 99.99% in all samples. Die-off of the indigenous microbes due to ozone treatment was inversely proportional to SOM and water content. Especially, sample 3 and Sample 4 containing relatively high SOM content and water content showed high regrowth rate, and this resulted from the increase of water soluble and biodegradable organic fraction in soil water after ozone treatment. Soil sample ozonated for 360 minutes showed minor increase in microbial population during 4 weeks of incubation period

유류오염토양 복원을 위한 지중 오존산화기술의 현장규모 적용

Field scale application of in-situ ozonation were carried out for remediation of variably saturated soils contaminated with diesel fuel with 3 dimensional test cell (3mx2mx2m). After 20 days of ozone injection, more than 90% of removal rate was observed through the 3-D test cell. This result might be caused by uniform distribution, relatively low oxidant demand, and low water content of soils, as well as high oxidation potential of ozone. However, less than 50 % of injected ozone was monitored through the 3-D test cell even after 20 days of injection