Liu Jianwei, Liu Junxin, Li Lin
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
J Environ Sci (China). 2008;20(12):1409-14. doi: 10.1016/s1001-0742(08)62541-3.
Two different functional biofilters were carried out and compared for the treatment of off-gas containing multicomponent odors and volatile organic compounds (VOCs) in this study. The effects of pH values and the empty bed retention time (EBRT) on the performance of the bioreactors were studied; and the characteristics of microbial populations in the two biofilters were also determined. The experimental results indicated that the removal efficiencies of hydrophilic compounds such as butyric acid and ammonia were higher in the neutral pH biofilter (NPB) than those in the low pH biofilter (LPB). In contrast, the removal efficiencies of the compounds with poor water solubility such as styrene and ethyl mercaptan were higher in the LPB than those in the NPB. The characteristics of microbial population in the two biofilters revealed that the heterotrophic bacteria, nonacidophilic thiobacteria, ammonia oxidizing bacteria, and nitrite oxidizing bacteria were major microorganisms in the NPB, whereas acidophilic thiobacteria and fungi were dominant in the LPB. Therefore, the performance of the biofilter depended on the characteristics of the compound being treated and the type of microorganisms.
本研究采用两种不同的功能性生物滤池对含多组分气味和挥发性有机化合物（VOCs）的废气进行处理并比较。研究了pH值和空床停留时间（EBRT）对生物反应器性能的影响；同时也测定了两种生物滤池中微生物群落的特征。实验结果表明，中性pH生物滤池（NPB）对丁酸和氨等亲水性化合物的去除效率高于低pH生物滤池（LPB）。相反，低pH生物滤池（LPB）对苯乙烯和乙硫醇等水溶性较差的化合物的去除效率高于中性pH生物滤池（NPB）。两种生物滤池中微生物群落的特征表明，异养细菌、非嗜酸硫杆菌、氨氧化细菌和亚硝酸盐氧化细菌是中性pH生物滤池（NPB）中的主要微生物，而嗜酸硫杆菌和真菌在低pH生物滤池（LPB）中占主导地位。因此，生物滤池的性能取决于待处理化合物的特性和微生物类型。
