Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6971239 | Journal of Hazardous Materials | 2014 | 7 Pages |
Abstract
Degradation of off-gas toluene from a toluene reservoir and a soil vapor extraction (SVE) process was investigated in a continuous pyrite Fenton system. The removal of off-gas toluene from the toluene reservoir was >95% by 8Â h in the pyrite Fenton system, while it was â¼97% by 3Â h in classic Fenton system and then rapidly decreased to initial level by 8Â h. Continuous consumption of low Fe(II) concentration dissolved from pyrite surface (0.05-0.11Â mM) was observed in the pyrite Fenton system, which can lead to the effective and successful removal of the gas-phase toluene due to stable production of OH radical (OH). Inhibitor and spectroscopic test results showed that OH was a dominant radical that degraded gas-phase toluene during the reaction. Off-gas toluene from the SVE process was removed by 96% in the pyrite Fenton system, and remnant toluene from rebounding effect was treated by 99%. Main transformation products from toluene oxidation were benzoic acid (31.4%) and CO2 (38.8%) at 4Â h, while traces of benzyl alcohol (1.3%) and benzaldehyde (0.7%) were observed. Maximum operation time of continuous pyrite Fenton system was estimated to be 56-61Â d and its optimal operation time achieving emission standard was 28.9Â d.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Health and Safety
Authors
Kyunghoon Choi, Sungjun Bae, Woojin Lee,