Particle and Aerosol Research Vol. 7, No. 1, March 2011 |
ISSN : 1738-8716 (Print) ISSN : 2287-8130 (Online) |
Biofilter performance and bacterial activity under intermittent and fluctuant xylene loads
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Abstracts
The effects of different transient loading conditions on xylene removability and bacterial activity were evaluated in the polyurethane (PU) biofilter inoculated with Rhodococcus sp. EH831: BF1 (the control) was operated under continuous
and constant loading (200¡¾50 ppm); BF2 under continuous and constant loading after a 2-week long-term shutdown;
BF3 under discontinuous (8 h on/16 h off on weekdays and a 2 day-shutdown at weekends) and constant loading BF4
under discontinuous and high loading (700 ¡¾ 300 ppm); and BF5 under continuous and fluctuating loading (high
loading for 8 h and low loading (75¡¾25 ppm) for 16 h on weekdays and low loading at weekends). Xylene removal
efficiencies in the BF1, BF2,BF3 and BF5 were ranged 83 –89%, indicating that 2-week long-term shutdown,
intermittent or fluctuant loading condition did not significantly influence the biofilter performance. However,
discontinuous and high load condition (BF4) caused to deteriorate xylene removability to 52%. Rhodococcus sp.
EH831 could be maintained at 109~1010 CFU/g-dry PU under 5 kinds of loading conditions. The result of polymerase
chain reaction-terminal-restriction fragment length polymorphismshowed that there was no significant change in
bacterial community structures by different loading conditions.
Keywords£ºBiofilter, Xylene, Loading condition, Rhodococcus sp., Polyurethane
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