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Effect of continuous ozone injection on performance and biomass accumulation of biofilters treating gaseous toluene

  • Environmental biotechnology
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A Note from the Publisher to this article was published on 19 February 2016

Abstract

Biofilters treating high-concentration gaseous volatile organic compounds (VOC) can be subject to bed clogging induced by excess biomass accumulation. In this study, O3 was continuously injected into biofilters to control biomass. Its effects on the performance of the biofilters and on biomass accumulation were investigated. Four identical biofilters designed to treat gaseous toluene were operated for 70 days, and three of them were continuously injected with O3 at different concentrations (from 80 to 320 mg/m3). The results showed that continuous O3 injection could effectively keep the bed pressure drop stable and had no adverse effect on toluene removal when O3 concentrations were 180–220 mg/m3. The maximum toluene elimination capacity of the four biofilters was 140 g-toluene/m3/h, and the bed pressure drop of the biofilter fed with 180–220 mg/m3 O3 remained below 3 mmH2O/m throughout the operation period. The biomass accumulation rates of the three biofilters with O3 at 80–320 mg/m3 were lowered by 0.15–0.25 g/L/day compared with the biofilter without O3. The decreases in biomass accumulation resulted in higher void fractions of the filter beds with O3 injection. Carbon balance analysis indicated that CO2 production had increased while biomass accumulation and leachate waste production decreased in response to O3 injection. Based on the experimental results, it was concluded here that continuous O3 injection can reduce increases in bed pressure effectively, preserve VOC removal capacity, and prevent production of extra leachate waste.

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Acknowledgments

This research is supported by the National Natural Science Foundation of China (Grant No. 51378286), the special fund of State Key Joint Laboratory of Environment Simulation and Pollution Control (Project number 11Y04ESPCT), and the Collaborative Innovation Center for Regional Environmental Quality.

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Authors and Affiliations

  1. Environmental Simulation and Pollution Control State Key Joint Laboratory, State Environmental Protection Key Laboratory of Microorganism Application and Risk Control (SMARC), School of Environment, Tsinghua University, 100084, Beijing, People’s Republic of China

    Jinying Xi, Prakit Saingam, Feng Gu, Hong-Ying Hu & Xuefei Zhao

  2. Shenzhen Laboratory of Microorganism Application and Risk Control, Graduate School at Shenzhen, Tsinghua University, 518055, Shenzhen, People’s Republic of China

    Hong-Ying Hu

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  1. Jinying Xi
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  2. Prakit Saingam
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Correspondence to Jinying Xi.

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Xi, J., Saingam, P., Gu, F. et al. Effect of continuous ozone injection on performance and biomass accumulation of biofilters treating gaseous toluene. Appl Microbiol Biotechnol 98, 9437–9446 (2014). https://doi.org/10.1007/s00253-014-5888-z

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  • DOI: https://doi.org/10.1007/s00253-014-5888-z

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