Effects of Gas Flow Rate, Inlet Concentration and Temperature on Biofiltration of Volatile Organic Compounds in a Peat-Packed Biofilter

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The effects of incoming gas concentration, empty bed residence time (EBRT), and column temperature on the removal efficiency of volatile organic compounds (isoprene, dimethyl sulfide, chloroform, benzene, trichloroethylene, toluene, m-xylene, ο-xylene and styrene) were studied for 101 d in a biofilter comprising two glass columns (I.D. 5.0 cm×height 62 cm) packed with peat. At an EBRT of 3 min the removal efficiency increased up to 90% 34 d after start up at both 25℃ and 45℃ when the incoming gas concentration was raised stepwise to 65 g・m^<-3>. When the incoming gas concentration increased to 83 g・m^<-3>, the removal efficiency was 93% at 25℃, but dropped to 74% at 45℃. At an incoming gas concentration of 92 g・m^<-3> and an EBRT of 1.5 min, the removal efficiencies were 91 % and 94% at 25℃ and 32℃ respectively. However, at 1 min of EBRT, the removal efficiencies decreased to 68% and 81% at 25℃ and 32℃ respectively. The removal rate per unit time and per unit volume of the biofilter was proportional to the incoming gas rate up to 3483 g VOC・m^<-3>・h^<-1>. Further increase of the incoming gas rate lowered the removal rate as coinpared to that predicted by the proportionality. The maximum removal rate was 3977 g・m^<-3>・h^<-1> at 32℃. At an EBRT of 1.5 min, the removal efficiency was highest for isoprene (93%), and lowest for chloroform (84%). Aromatic compounds (benzene, toluene, and xylene) were removed by 93- 94%. The cell concentration increased 100-fold from the initial value, and reached 1.12×10^8 cells・(g of dry peat)^<-1>. At 32℃, 67% of the incoming VOC was removed in the first quarter of the column.
社団法人日本生物工学会の論文
2002-02-25

Effects of Gas Flow Rate, Inlet Concentration and Temperature on Biofiltration of Volatile Organic Compounds in a Peat-Packed Biofilter

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