PMID- 19345397
OWN - NLM
STAT- MEDLINE
DCOM- 20090618
LR  - 20131121
IS  - 1879-1298 (Electronic)
IS  - 0045-6535 (Linking)
VI  - 75
IP  - 10
DP  - 2009 Jun
TI  - Biological treatment of benzene in a controlled trickle bed air biofilter.
PG  - 1315-21
LID - 10.1016/j.chemosphere.2009.03.008 [doi]
AB  - Trickle bed air biofilters (TBABs) are suitable for treatment of relatively high 
      volumes of volatile organic compounds due to their controlled environment. A 
      laboratory-scale TBAB was used for the treatment of an air stream contaminated 
      with benzene under different loading rates (LRs) ranging from 7.2 to 76.8 
      gm(-3)h(-1). The TBAB was operated at pH 7 and 25 degrees C. Consistent long-term 
      performance of the benzene TBAB depends on various factors one of which is the 
      excess amount of biomass accumulated within the bed. Three experimental 
      strategies for biomass control were employed in the study: weekly backwashing for 
      1h, starvation (no benzene feed for a period of 2d/week) and stagnation (no 
      benzene, air and nutrient flow for a period of 2d/week). The experimental plan 
      was designed to investigate the long-term performance of the TBAB with emphasis 
      on the empty bed resident time (EBRT), different benzene LRs, removal efficiency 
      with TBAB depth, volatile suspended solids and carbon mass balance closure. For 
      benzene loading up to 34.1gm(-3)h(-1), removal efficiency consistently over 98% 
      was achieved. At the maximum LR 76.8 gm(-3)h(-1) the removal efficiency was still 
      above 80% by utilizing stagnation strategy for 2d and gas flow switching once per 
      week as means of biomass control. Backwashing once per week provided less 
      efficient performance as compared to stagnation while starvation showed the worst 
      performance. EBRT at 120 s provided the best performance while EBRT at 90 s 
      showed slightly lower performance.
FAU - Aly Hassan, Ashraf
AU  - Aly Hassan A
AD  - Department of Civil and Environmental Engineering, University of Cincinnati, 765 
      Baldwin Hall, 2624 Clifton Avenue, Cincinnati, OH 45221-0071, United States.
FAU - Sorial, George
AU  - Sorial G
LA  - eng
PT  - Journal Article
DEP - 20090403
PL  - England
TA  - Chemosphere
JT  - Chemosphere
JID - 0320657
RN  - 0 (Air Pollutants)
RN  - J64922108F (Benzene)
SB  - IM
MH  - Air Pollutants/*metabolism
MH  - Benzene/*metabolism
MH  - Biodegradation, Environmental
MH  - Biomass
MH  - Filtration/*methods
MH  - Kinetics
EDAT- 2009/04/07 09:00
MHDA- 2009/06/19 09:00
CRDT- 2009/04/07 09:00
PHST- 2008/10/22 00:00 [received]
PHST- 2009/03/02 00:00 [revised]
PHST- 2009/03/03 00:00 [accepted]
PHST- 2009/04/07 09:00 [entrez]
PHST- 2009/04/07 09:00 [pubmed]
PHST- 2009/06/19 09:00 [medline]
AID - S0045-6535(09)00293-8 [pii]
AID - 10.1016/j.chemosphere.2009.03.008 [doi]
PST - ppublish
SO  - Chemosphere. 2009 Jun;75(10):1315-21. doi: 10.1016/j.chemosphere.2009.03.008. 
      Epub 2009 Apr 3.