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Ozone and hydrogen peroxide as strategies to control biomass in a trickling filter to treat methanol and hydrogen sulfide under acidic conditions

  • Environmental biotechnology
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Abstract

The operation and performance of a biotrickling filter for methanol (MeOH) and hydrogen sulfide (H2S) removal at acid pH was studied. Excess biomass in the filter bed, causing performance loss and high pressure drop, was controlled by intermittent addition, of ozone (O3) and hydrogen peroxide (H2O2). The results showed that after adaptation to acid pH, the maximum elimination capacity (EC) reached for MeOH was 565 g m−3 h −1 (97 % RE). High MeOH loads resulted in increased biomass concentration within the support, triggering reductions in the removal efficiency (RE) for both compounds close to 50 %, and high pressure drop. At this stage, an inlet load of 150.2 ± 16.7 g m−3 h−1 of O3 was fed by 38 days favoring biomass detachment, and EC recovery and lower pressure dropped with a maximum elimination capacity of 587 g m−3 h−1 (81 % RE) and 15.8 g m−3 h−1 (97 % RE) for MeOH and H2S, respectively. After O3 addition, a rapid increase in biomass content and higher fluctuations in pressure drop were observed reducing the system performance. A second treatment with oxidants was implemented feeding a O3 load of 4.8 ± 0.1 g m−3 h−1 for 7 days, followed by H2O2 addition for 23 days, registering 607.5 gbiomass L−1 packing before and 367.5 gbiomass L−1 packing after the oxidant addition. PCR-DGGE analysis of different operating stages showed a clear change in the bacterial populations when O3 was present while the fungal population was less affected.

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Acknowledgments

The authors thank Universidad Autónoma Metropolitana and CONACYT for the scholarship (372404), as well as the CI3M Center by conducting analyses of MRI. Special thanks to Dra. Angélica López Moreno for their help and collaboration in the analysis of molecular biology, as well as to Dra. Alejandra Serrato Díaz and to the Laboratory of Molecular Biology of the UAM-Iztapalapa.

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Correspondence to Sergio Revah.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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The authors declare that they have no conflict of interest.

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García-Pérez, T., Le Borgne, S. & Revah, S. Ozone and hydrogen peroxide as strategies to control biomass in a trickling filter to treat methanol and hydrogen sulfide under acidic conditions. Appl Microbiol Biotechnol 100, 10637–10647 (2016). https://doi.org/10.1007/s00253-016-7861-5

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  • DOI: https://doi.org/10.1007/s00253-016-7861-5

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