간헐적이고 불규칙적인 부하 조건에서 바이오필터의 Xylene 제거 성능 및 세균 활성
Biofilter performance and bacterial activity under intermittent and fluctuant xylene loads
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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±50 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 BF4under discontinuous and high loading (700 ± 300 ppm); and BF5 under continuous and fluctuating loading (high loading for 8 h and low loading (75±25 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.
Abstract
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±50 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 BF4under discontinuous and high loading (700 ± 300 ppm); and BF5 under continuous and fluctuating loading (high loading for 8 h and low loading (75±25 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.
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