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Effects of Loading Type and Temperature on Performance, Transient Operation, and Kinetics of n-Hexane Vapor Removal in a Biofilter

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Abstract

In this research, different inlet concentrations of n-hexane vapor (1–11 g m−3) corresponds to the inlet loading rates of 9–598 g m−3 h−1 at different temperatures (35–45 °C) were eliminated from air under continuous and intermittent loading (10-h feeding per day) in a biofilter packed with compost and lava rock. Loading type had minor effect on the n-hexane removal at 35 °C and the removal efficiency (RE) was in the range of 70 to 100 % at an inlet concentration of 11 gm−3. On the contrary, RE dropped significantly to 25 % at 40 °C under intermittent loading while it was 77 % under continuous loading with the inlet concentration of 9 g m−3 and empty bed residence time (EBRT) of 2 min. Increasing the temperature to 45 °C significantly reduced the RE at both types of loading at both EBRTs of 2 and 1.3 min; however, intermittent loading was led to a slightly greater removal. According to transient-state experiment under intermittent loading at EBRT of 2 min, the biochemical reaction became the dominant mechanism, after an initial short period, every day to remove n-hexane rather than adsorption on bed. Kinetic modeling showed that the biodegradation rates changed linearly with increase in the logarithmic mean n-hexane concentration during intermittent loading at different temperatures while the order of reaction was higher at continuous loading.

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Acknowledgments

The authors gratefully acknowledge Dr. Babak Bonakdarpour for his practical comments and reviewing of the manuscript.

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Authors and Affiliations

  1. Biotechnology Group, Chemical Engineering Department, Tarbiat Modares University, P.O. Box: 14115–143, Tehran, Iran

    Seyed Morteza Zamir

  2. Chemical Engineering Department, Amirkabir University of Technology, Hafez Ave., P.O. Box 15875–4413, Tehran, Iran

    Milad Ferdowsi & Rouein Halladj

Authors
  1. Seyed Morteza Zamir
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  2. Milad Ferdowsi
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  3. Rouein Halladj
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Corresponding author

Correspondence to Rouein Halladj.

Glossary

BF

Biofilter

BTF

Biotrickling filter

EBRT

Empty bed residence time (min)

EC

Elimination capacity (g m−3 h−1)

IL

Inlet load (g m−3 h−1)

RE

Removal efficiency (%)

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Zamir, S.M., Ferdowsi, M. & Halladj, R. Effects of Loading Type and Temperature on Performance, Transient Operation, and Kinetics of n-Hexane Vapor Removal in a Biofilter. Water Air Soil Pollut 225, 1825 (2014). https://doi.org/10.1007/s11270-013-1825-5

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  • DOI: https://doi.org/10.1007/s11270-013-1825-5

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