Performance of a fungal monolith bioreactor for the removal of styrene from polluted air
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Performance of a fungal monolith bioreactor for the removal of styrene from polluted airData
2010-04Cita bibliográfica
Rene ER, López ME, Veiga MC, Kennes C. Performance of a fungal monolith bioreactor for the removal of styrene from polluted air. Bioresour Technol. 2010;101(8):2608-15.
Resumo
Gas-phase styrene removal using the fungus, Sporothrix variecibatus was evaluated in a
novel monolith bioreactor, receiving a continuous supply of nutrients from the trickling
liquid phase. During the start-up process, the monolith reactor was operated for 22 days
with relatively low styrene concentrations in the gas-phase (<0.4 g m−3). Afterwards,
continuous experiments were carried out at different inlet styrene concentrations,
ranging between 0.06 and 2.5 g m−3, and at two different flow rates corresponding to
empty bed residence times (EBRTs) of 77 and 19 s, respectively. A maximum
elimination capacity of 67.4 g m−3 h−1 was observed at an inlet styrene load of
73.5 g m−3 h−1. However, it was observed that the critical loading rates to the monolith
bioreactor were a strong function of the gas residence time. The critical load, with
greater than 95% styrene removal was 74 g m−3 h−1 at an EBRT of 77 s, while it was
only 37.2 g m−3 h−1 for an EBRT of 19 s. After 92 days of continuous operation, due to
excess biomass growth on the surface of the monolith, the biodegradation efficiency
decreased significantly. To ascertain the instantaneous response of the attached fungus,
to withstand fluctuations in loading conditions, two dynamic shock loads were
conducted, at EBRTs of 77 and 19 s, respectively. It was observed that, the performance
of the monolith bioreactor decreased significantly at low residence times, when
subjected to high shock loads. The recovery times for high performance, in both cases,
did not exceed more than 1 h.
Palabras chave
Monolith reactor
Sporothrix variecibatus
Biofilter
Clogging
Transient-state operation
Sporothrix variecibatus
Biofilter
Clogging
Transient-state operation