Limits...
Potential application of an Aspergillus strain in a pilot biofilter for benzene biodegradation

View Article: PubMed Central - PubMed

ABSTRACT

A biofilter with fungus was developed for efficient degradation of benzene, which can overcome the potential risk of leakage commonly found in such services. Results indicated that the optimum parameter values were temperature 40 °C, pH 6, and 500 mg L−1 of the initial benzene concentration. Besides, the empty bed residence time and inlet load range of biofilter were set to 20 s and 21.23–169.84 g m−3 h−1 respectively. Under these conditions, this biofilter can obtain the maximum removal efficiency of more than 90%, the eliminating capacity could be up to 151.67 g m−3 h−1. Furthermore, scanning electron microscopy was used to investigate three filler materials for packing fungus biofilm. This is the first study introducing an Aspergillus strain for benzene removal and these results highlight that the development of this biofilter has the potential scaling-up application as gas-processing of industrial wastes.

No MeSH data available.


The comparison of benzene removal efficiency with different parameters in 8 d.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC5382587&req=5

f2: The comparison of benzene removal efficiency with different parameters in 8 d.

Mentions: Figure 2 exhibits that the removal efficiency reaches maximum value of 98 ± 1.4% when the pH is 6 and the TEMP is 40 °C. it may be due to the enzyme producing ability of Aspergillus versicolor achieving the top level under these conditions29. As the key enzymes in the biodegradation of benzene series, monooxygenase and dioxygenase appeared in many metabolic pathways of biodegradation30313233. And the removal efficiency became relatively low departing from the optimum reaction TEMP which accorded with the enzymatic properties. pH plays an important role in the secretion of active metabolite. Under abiotic factors duress, the expression of enzyme genes related to benzene metabolism could change accordingly to permit survival of the affected343536. RE can exceed 80% in most of the experimental range which may benefit from the resilience of HD-5 to severe environment. Previous studies found that fungus as the biofilm for biofilter has an advantage over bacteria in removing organics3738. This advantage cannot be ignored in the practical industry with a great pH fluctuation of industrial wastes3940.


Potential application of an Aspergillus strain in a pilot biofilter for benzene biodegradation
The comparison of benzene removal efficiency with different parameters in 8 d.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5382587&req=5

f2: The comparison of benzene removal efficiency with different parameters in 8 d.
Mentions: Figure 2 exhibits that the removal efficiency reaches maximum value of 98 ± 1.4% when the pH is 6 and the TEMP is 40 °C. it may be due to the enzyme producing ability of Aspergillus versicolor achieving the top level under these conditions29. As the key enzymes in the biodegradation of benzene series, monooxygenase and dioxygenase appeared in many metabolic pathways of biodegradation30313233. And the removal efficiency became relatively low departing from the optimum reaction TEMP which accorded with the enzymatic properties. pH plays an important role in the secretion of active metabolite. Under abiotic factors duress, the expression of enzyme genes related to benzene metabolism could change accordingly to permit survival of the affected343536. RE can exceed 80% in most of the experimental range which may benefit from the resilience of HD-5 to severe environment. Previous studies found that fungus as the biofilm for biofilter has an advantage over bacteria in removing organics3738. This advantage cannot be ignored in the practical industry with a great pH fluctuation of industrial wastes3940.

View Article: PubMed Central - PubMed

ABSTRACT

A biofilter with fungus was developed for efficient degradation of benzene, which can overcome the potential risk of leakage commonly found in such services. Results indicated that the optimum parameter values were temperature 40 °C, pH 6, and 500 mg L−1 of the initial benzene concentration. Besides, the empty bed residence time and inlet load range of biofilter were set to 20 s and 21.23–169.84 g m−3 h−1 respectively. Under these conditions, this biofilter can obtain the maximum removal efficiency of more than 90%, the eliminating capacity could be up to 151.67 g m−3 h−1. Furthermore, scanning electron microscopy was used to investigate three filler materials for packing fungus biofilm. This is the first study introducing an Aspergillus strain for benzene removal and these results highlight that the development of this biofilter has the potential scaling-up application as gas-processing of industrial wastes.

No MeSH data available.