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KMID : 1094720150200050924
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Biotechnology and Bioprocess Engineering
2015 Volume.20 No. 5 p.924 ~ p.930
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Effects of oxygen content on the simultaneous microbial removal of SO2 and NOx in biotrickling towers
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Wang Xing Chun
Bi Xiao Yi
Sun Pei Shi
Chen Jin Quan
Zou Ping
Ma Xiao Ming
Zhang Jing
Wang Hai Yu
Xu Xiao Yi
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Abstract
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This study uses microbial methods to research the influence of oxygen (O2) content on the removal efficiency of sulfur dioxide (SO2) and nitrogen oxides (NOx) in a tandem twin-towers desulfurization and denitrification process system. Oxygen can play a significant role in biotrickling towers. Other important factors had already been optimized prior to the study, including inlet concentration, gas flow rate, and temperature. SO2 and NOx were prepared by a chemical method. A gas flow meter was used to regulate nitrogen (N2) that had been stored in steel cylinders. In this way, the O2 content was adjusted in the biotrickling towers by controlling the N2 flow rate. Five gradients of O2 content were selected for investigation, namely 4, 8, 12, 16, and 20%. Results indicated that the SO2 removal efficiency from mixed gas (SO2 and NOx) can reach 100%, from all of the five O2 gradients, in biotrickling towers. In a tandem twin-towers desulfurization and denitrification process system, the NOx removal efficiency and the inlet concentration of nitrogen dioxide (NO2) gradually increased as the O2 content increased. Specifically, the average removal efficiency of NOx increased from 49.28 to 80.85% as the O2 content changed from 4 to 20%. The oxygen levels influenced the removal of NOx but the SO2 removal efficiency in mixed gas was always stable.
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KEYWORD
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biotrickling filter, oxygen content, sulfur dioxide, nitrogen oxides, removal efficiency
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