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Orientador(es)
Resumo(s)
A suspended-growth bioreactor (SGB) was operated for the treatment of a gaseous stream mimicking emissions generated at a leather industrial company. The main volatile
organic compounds (VOCs) present
in the gaseous stream consisted
of 1-methoxy-2-propanol,
2,6-dimethyl-4-heptanone,
2-butoxyethanol,
toluene
and butylacetate.
A microbial
consortium
able to degrade these VOCs was successfully
enriched. A laboratory-
scale SGB was established
and operated
for 210-d with an 8 h cycle period and with shutdowns
at weekends.
Along this period, the SGB was exposed to organic loads (OL) between 6.5 and 2.3 £ 102 g h¡1 m¡3. Most
of the compounds
were not detected at the outlet
of the SGB. The highest
total VOC removal efficiency
(RE)
(ca 99%) was observed when an OL of 1.6 £ 102 g h¡1 m¡3 was fed to the SGB. The maximum
total VOC elimination
capacity
(1.8 £ 102 g h¡1 m¡3) was achieved when the OL applied to the SGB was 2.3 £ 102 g h¡1 m¡3. For all
the operating
conditions,
the SGB showed high levels
of degradation
of toluene
and butylacetate
(RE t 100%).
This study also revealed that recirculation
of the gaseous
effluent
improved the performance
of the SGB. Overall,
the SGB was shown to be robust, showing
high performance
after night and weekend shutdown
periods.
Descrição
Palavras-chave
Biological treatment Vapour phase bioreactor Suspended- growth bioreactor Volatile organic compounds Gaseous emissions
Contexto Educativo
Citação
"Chemosphere." ISSN 0045-6535. 74: 2 (2009) 232–238
Editora
Elsevier