Yoon In-Kil, Park Chang-Ho
Industrial Liaison Research Institute, Kyung Hee University, Yongin-si 449-701, Korea.
J Biosci Bioeng. 2002;93(2):165-9. doi: 10.1263/jbb.93.165.
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, o-xylene and styrene) were studied for 101 d in a biofilter comprising two glass columns (I.D. 5.0 cm x 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 degrees C and 45 degrees C 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 degrees C, but dropped to 74% at 45 degrees C. 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 degrees C and 32 degrees C, respectively. However, at 1 min of EBRT, the removal efficiencies decreased to 68% and 81% at 25 degrees C and 32 degrees C, 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 compared to that predicted by the proportionality. The maximum removal rate was 3977 g.m(-3).h(-1) at 32 degrees C. 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 x 10(8) cells.(g of dry peat)(-1). At 32 degrees C, 67% of the incoming VOC was removed in the first quarter of the column.
在一个由两个填充泥炭的玻璃柱（内径5.0厘米×高62厘米）组成的生物滤池中，研究了进气浓度、空床停留时间（EBRT）和柱温对挥发性有机化合物（异戊二烯、二甲基硫醚、氯仿、苯、三氯乙烯、甲苯、间二甲苯、邻二甲苯和苯乙烯）去除效率的影响，为期101天。在EBRT为3分钟时，当进气浓度逐步提高到65 g·m⁻³ ，在25℃和45℃下启动34天后，去除效率均提高到90%。当进气浓度增加到83 g·m⁻³ 时，25℃下的去除效率为93%，但在45℃下降至74%。在进气浓度为92 g·m⁻³ 且EBRT为1.5分钟时，25℃和32℃下的去除效率分别为91%和94%。然而，在EBRT为1分钟时，25℃和32℃下的去除效率分别降至68%和81%。生物滤池单位时间和单位体积的去除率与进气速率成正比，最高可达3483 g VOC·m⁻³·h⁻¹ 。与按比例预测的值相比，进气速率的进一步增加降低了去除率。32℃时的最大去除率为3977 g·m⁻³·h⁻¹ 。在EBRT为1.5分钟时，异戊二烯的去除效率最高（93%），氯仿的去除效率最低（84%）。芳香族化合物（苯、甲苯和二甲苯）的去除率为93% - 94%。细胞浓度从初始值增加了100倍，达到1.12×10⁸ 个细胞·（每克干泥炭）⁻¹ 。在32℃时，67%的进气挥发性有机化合物在柱的第一季度被去除。
