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Keywords:

  • hydrophobic VOCs;
  • spore emission;
  • Fusarium solani;
  • fungal biofiltration

Abstract

BACKGROUND: The effect of the inlet n-pentane load (IL), empty bed residence time (EBRT) and mineral medium (MM) addition on spore emission and elimination capacity (EC) was evaluated using the fungus Fusarium solani in a vermiculite-based biofilter.

RESULTS: When the process was operated at an EBRT of 3.7 min and an IL of 100 g mequation image h−1, the weekly addition of MM from 6.8 to 13.6 mLMM Lequation image resulted in fluctuacting dynamics of ECs and spore emission.

When varying the n-pentane IL from 25 to 875 g mequation image h−1, a maximum EC of 110 g mequation image h−1 associated with a spore emission of 1.8 × 104 CFU mequation image was recorded. The critical inlet load for 90% n-pentane removal was 50 g mequation image h−1 with spore emission 4.5 × 103 CFU mequation image. Finally, when the EBRT was decreased from 3.7 to 2.1 min at a constant n-pentane IL of 50 g mequation image h−1 the EC decreased by 110%.

CONCLUSIONS: The results show a poor performance of the n-pentane biofiltration system at high IL and low EBRT, which was further confirmed by the low final biomass concentrations in the biofilter (62 mgbiomass gequation image). Copyright © 2012 Society of Chemical Industry