生物滴滤塔净化低浓度苯乙烯废气的研究

Biotrickling Filter Treating Styrene Waste Gas in Low Concentration

在生物滴滤塔中进行低浓度苯乙烯废气的生物净化实验,建立动力学模型,测定苯乙烯实验数据并定性定量检测生物膜微种群。当进口气体浓度为200～1000mg/m3、气体流量0.2～0.25 L/h、液体喷淋量10×10-3～12×10-3m3/h、停留时间50～65s、循环液体pH6.5～7.5时,净化效率为90%～99%。动力学模型的模拟计算值与实验值之间有很好的相关性,相关系数R为0.96～0.99。湿润生物膜微群落的优势菌种群包括恶臭假单胞菌、梭形芽胞杆菌、罗非氏不动杆菌等。恶臭假单胞菌的最大活菌数为5.5×107CFU/g,并随生物滴滤塔运行时间延长有减少趋势。

A biodegradation experiment on treating styrene in low concentration was run in a biotdckling filter. The related kinetic model was built. Experimental data of styrene and quantitative microbial investigation of moist biofilm was obtained. When the concentration of styrene ranged from 200 mg/m^3 to 1000 mg/m^3, gas flow ranged from 0.2L/h to 0.25L/h, liquid flow ranged from 10×10^-3m^3/h to 12×10^-3m^3/h, elapsed time was 50s to 65s, pH ranged from 6.5 to 7.5, styrene removal efficiency could be arrived at 90%-99%. A good pertinence was showed between calculated data and test dada, with interrelation coefficients of 0.96-0.99. The dominant micropopulations in moist biofilm include Pseudomonas putida, Bacillus fusiformis and Acinetobacter lwoffii. Maximal living bacterial cells of Pseudomonas putida in biofilm was 5.5×10^7CFU/g, and the living cells decreased with increasing duration of biotrickling filter operating period.