摘要
分别以营养型缓释填料的生物过滤塔（BF）和聚氨酯小球为填料的生物滴滤塔（BTF）去除二氯甲烷（DCM）模拟废气．结果表明，采用“专属菌＋综合菌”挂膜方式，BTF和BF分别在25d和22d内完成快速挂膜．扫描电镜结果表明，BF填料表面的菌落结构较为疏松、生物膜较薄，BTF填料表面的菌落结构致密、生物膜较厚．在DCM进口浓度100～1500mg·m^-1、停留时间25～85s条件下，BTF和BF对DCM均有较好的去除效果，最大去除负荷分别为22．61g·（m3·h）^-1和29．05g·（m3·h）^-1．滤塔中CO，生产量与DCM降解量呈线性关系，经拟合得出BTF和BF的矿化率分别为70．4％和66．8％，且BTF矿化程度好于BF，表明滤塔内减少的DCM主要是被微生物利用降解．滤塔内DCM的降解动力学行为符合Michaelis—Menten模型，BTF和BF单位体积最大降解速率rmax分别为22．7790g·（m3·h）^-1和28．5714g·（m3·h）^-1，气相饱和常数K。分别为0．1412g·m^-3和0．1486g·m^-3．
A biofilter （BF） packed with nutrition slow-release material and a biotrickling filter （BTF） packed with ether-based polyurethane foam were set up to remove diehloromethane （DCM） from exhaust gas. Results showed that the hiofilm formations in BTF and BF were completed by using the mixture of a special strain and a bacterial community, within 25d and 22d, respectively. Through the observation of the filter surface by SEM, the surface of packings in BF was loose with thin biofilm colonies, whereas the one in BTF was dense with thick biofilm. Under the condition of inlet DCM concentration of 100-1 500 mg.m-3, EBRT of 25-85 s, the removal efficiency of DCM in BTF was better than that in BF, and the maximum removal load was 22.61 g·（m3·h）^-1 and 29.05 g·（m3·h）^-1, respectively. The relationship between CO2 production and DCM removal was approximately linear, with the mineralization rate being 70. 4% and 66.8% for BTF and BF, respectively. The dynamic behaviors of DCM in BTF and BF were described by the Miehaelis-Menten model. Through the calculation, the unit volume maximum degradation rate rmax was 22. 779 0 g·（m3·h）^-1 and 28. 571 4 g·（m3·h）^-1, while the gas phase saturation constant Ks was 0. 141 2 g.m-3 and 0. 148 6 g·m-3, respectively for BTF and BF.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2013年第12期4675-4683,共9页
Environmental Science
基金
教育部博士点基金项目(20093317110003)
国家国际科技合作项目(2011DFA92660)
浙江省重大科技专项项目(2011C13023)
关键词
生物过滤塔
生物滴滤塔
二氯甲烷
去除负荷
矿化率
biofiher
biotrickling filter
dichloromethane
removal load
mineralization rate
