4.7 Article

Efficient purification of toluene gas by anoxic denitrification

期刊

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 28, 期 9, 页码 11683-11688

出版社

SPRINGER HEIDELBERG
DOI: 10.1007/s11356-020-12311-9

关键词

Volatile organic compounds; Electron acceptor; Hypoxia; Bioreactor; Biofilm; Purification performance

资金

  1. National Natural Science Foundation of China [51602281]
  2. Natural Science Foundation of Jiangsu Province [BK20160473]
  3. Yangzhou University Institute for Laboratory Environmental Protection and Intelligent Equipment and Jiangsu Ke Shi Da Laboratory Environmental Protection Technology [2018SQKF07]
  4. Yangzhou University Jiangdu High-end Equipment Research Institute [204020719]
  5. Yangzhou University [YZUZZ2019-17]

向作者/读者索取更多资源

This study investigated the purification of toluene waste gas using liquid-phase absorption and anoxic denitrification. The results showed that the denitrifying reactor had higher removal efficiency and capacity compared to the traditional bioreactor, indicating its potential in improving toluene waste gas treatment.
As a part of volatile organic compounds (VOCs), toluene does harm to human health. This paper reported the purification of toluene waste gas by liquid-phase absorption and anoxic denitrification. In this work, two same biofilm reactors were set to treat toluene waste gas, one of which was added into nitrate as an electron acceptor. Then, the purification properties of toluene waste gas treated by anoxic denitrification and biological methods were compared. The results indicate that with the increase of toluene mass concentration, the toluene removal rate of the denitrifying reactor decreased slightly. When the inlet concentration increased from 50 mg m(-3) to 3440 mg m(-3), the removal efficiency of the denitrifying reactor remained over 94.1% while the removal efficiency of the traditional bioreactor decreased to 82.9%. The highest removal capacity of the denitrifying reactor was 127.2 g m(-3) h(-1), which was 11.8% higher than that of the traditional bioreactor. Toluene was degraded by denitrification inside the biofilm microenvironment hypoxia; the denitrification rate increased along with the increase of inlet concentration within certain limits and reached a maximum of 2.4 mg NO3--N L-1 h(-1). Nitrate can act as an electron acceptor, and denitrification can promote aerobic degradation and intensify the concentration gradient inside the biofilm to strengthen the toluene transfer process.

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