Effect of loading types on performance characteristics of a trickle-bed bioreactor and biofilter during styrene/acetone vapor biofiltration
| Autor: | Evguenii I. Kozliak, Kim D. Jones, Martin Halecky, Jan Paca |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
Environmental Engineering Materials science Backwashing 010501 environmental sciences 01 natural sciences Styrene Acetone chemistry.chemical_compound Bioreactors Air Pollution 010608 biotechnology Bioreactor Humans 0105 earth and related environmental sciences Pollutant Air Pollutants Chromatography General Medicine Trickle-bed reactor chemistry Chemical engineering Biofilter Degradation (geology) Filtration |
| Zdroj: | Journal of Environmental Science and Health, Part A. :1-10 |
| ISSN: | 1532-4117 1093-4529 |
| DOI: | 10.1080/10934529.2016.1159882 |
| Popis: | A 2:1 (w/w) mixture of styrene (STY) and acetone (AC) was subjected to lab-scale biofiltration under varied loading in both a trickle bed reactor (TBR) and biofilter (BF) to investigate substrate interactions and determine the limits of biofiltration efficiency of typical binary air pollutant mixtures containing both hydrophobic and polar components. A comparison of the STY/AC mixture degradation in the TBR and BF revealed higher pollutant removal efficiencies and degradation rates in the TBR, with the pollutant concentrations increasing up to the overloading limit. The maximum styrene degradation rates were 12 and 8 gc m(-3) h(-1) for the TBR and BF, respectively. However, the order of performance switched in favor of the BF when the loading was conducted by increasing air flow rate while keeping the inlet styrene concentration (Cin) constant in contrast to loading by increasing Cin. This switch may be due to a drastic difference in the effective surface area between these two reactors, so the biofilter becomes the reactor of choice when the rate-limiting step switches from biochemical processes to mass transfer by changing the loading mode. The presence of acetone in the mixture decreased the efficiency of styrene degradation and its degradation rate at high loadings. When the overloading was lifted by lowering the pollutant inlet concentrations, short-term back-stripping of both substrates in both reactors into the outlet air was observed, with a subsequent gradual recovery taking several hours and days in the BF and TBR, respectively. Removal of excess biomass from the TBR significantly improved the reactor performance. Identification of the cultivable strains, which was performed on Day 763 of continuous operation, showed the presence of 7 G(-) bacteria, 2 G(+) bacteria and 4 fungi. Flies and larvae of Lycoriella nigripes survived half a year of the biofilter operation by feeding on the biofilm resulting in the maintenance of a nearly constant pressure drop. |
| Databáze: | OpenAIRE |
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