期刊
INDOOR AND BUILT ENVIRONMENT
卷 21, 期 6, 页码 741-748出版社
SAGE PUBLICATIONS LTD
DOI: 10.1177/1420326X11428342
关键词
Indoor air quality; Volatile organic compounds; Bake-out; Biotrickling filter; Bioaugmentation
类别
资金
- Beijing HVAC Key Lab of Beijing Institute of Civil Engineering and Architecture [KF00505]
- Fundamental Research Funds for the Central Universities of China [DUT10RC(3)103]
- Liaoning Provincial Scientific Research Foundation [20111027]
A new technical development of biological treatment coupled with bake-out exhaust was applied to deal with indoor volatile organic compounds (VOCs). Bake-out exhaust method was used to significantly accelerate the release of VOCs from building materials. Biotechnology was used in order to avoid the baked indoor air with high level of VOCs being exhausted outdoors directly, which may cause pollution problems in dense building areas without sufficient urban ventilation. Experiments show that baking 10 h at 40 degrees C, the emission rate and concentration of VOCs increased significantly compared with less baking time and temperature. The gas was moved into the biotrickling filter after baking. Under the conditions of gaseous flow rate of 0.6 m(3).h(-1), surface liquid velocity of 3.14 m.h(-1), pH of 6-7 and inlet temperature of 40 degrees C, VOCs were biotreated. For formaldehyde, benzene, toluene and xylene in the air stream with the concentration of 10.6 mg.m(-3), 46.0 mg.m(-3), 39.8 mg.m(-3) and 42.1 mg.m(-3), the removal efficiencies of biotrickling filter were about 100%, 48.9%, 66.2% and 66.3%, respectively. Four high-efficient bacteria were optimized and screened out from the biotrickling filter. After bioaugmentation, benzene, toluene and xylene removal efficiencies increased to 14.7%, 6.2% and 11.7%, respectively.
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