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J Hazard Mater

Title:		Degradation of off-gas toluene in continuous pyrite Fenton system
Author(s):		Choi K; Bae S; Lee W;
Address:		"Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea. Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea. Electronic address: woojin_lee@kaist.ac.kr"
Journal Title:		J Hazard Mater
Year:		2014
Volume:		20140801
Issue:
Page Number:		31 - 37
DOI:		10.1016/j.jhazmat.2014.07.054
ISSN/ISBN:		1873-3336 (Electronic) 0304-3894 (Linking)
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 8h in the pyrite Fenton system, while it was approximately 97 % by 3h in classic Fenton system and then rapidly decreased to initial level by 8h. Continuous consumption of low Fe(II) concentration dissolved from pyrite surface (0.05-0.11 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 4h, 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 56-61 d and its optimal operation time achieving emission standard was 28.9 d"
Keywords:		Air Pollution/prevention & control Environmental Pollutants/*chemistry Hydrogen Peroxide/*chemistry Iron/*chemistry Oxidation-Reduction Sulfides/*chemistry Toluene/*chemistry Volatile Organic Compounds/chemistry Continuous pyrite Fenton Oh Off-gas organic;
Notes:		"MedlineChoi, Kyunghoon Bae, Sungjun Lee, Woojin eng Evaluation Study Research Support, Non-U.S. Gov't Netherlands 2014/08/16 J Hazard Mater. 2014 Sep 15; 280:31-7. doi: 10.1016/j.jhazmat.2014.07.054. Epub 2014 Aug 1"