生物炭降解苯和甲苯混合废气性能研究

该研究以生物炭为过滤介质 ,探讨过滤塔降解气流中苯、甲苯的生物降解性能 .实验表明 ,在总有机负荷低于 3 5 0 g/ (h·m3)、停留时间 1 5～ 90s的实验条件下 ,滤塔对苯和甲苯混合气体有较好的降解性能 ,苯、甲苯的最大削减能力分别为 1 2 0 g/ (h·m3)和 1 5 0 g/ (h·m3) ,甲苯比苯更易被微生物降解 .滤塔中CO2 生成量随苯、甲苯降解量的增加而增加 ,但实验增长速率小于理论增长速率 .菌落分析表明 ,滤塔中微生物主要有真菌、杆菌、芽孢杆菌 ,其中芽孢杆菌为优势菌种 .根据吸附 生物降解机理 ,建立了VOCs去除模型 ,并予以验证 .

Use of biological activated carbon to degrade benzene and toluene in a biofilter

The biodegradation of toluene and benzene in a biofilter using cylindrical activated carbon as the filler materials was studied. For total mass loading lower than 350 g/(h.m3), retention time ranging from 15 s to 90 s the biofilter proved to be highly efficient in biodegradation of toluene and benzene, their removal capacity were 120 and 150 g/(h.m3) respectively and toluene was more easily degraded than benzene. The CO2 produced increased with the degradation of benzene and toluene, but the experimental value was lower than the theoretical value. The observation of biotic community demonstrated that the microbes consisted of bacillus, spore bacillus and fungi, of them spore bacillus was dominant. According to basic theories of mass-transfer, adsorption and biodegradation process, mathematical model of removal of VOCs by biofiltration was established and verified.