生物滴滤塔同步降解多组分挥发性有机物的实验研究

Performance of BTF simultaneously treating a mixture of volatile organic compounds

采用定向驯化活性污泥接种生物滴滤塔(BTF)同时处理甲苯、甲醇、丙烯酸乙酯挥发性有机化合物(VOCs)混合废气,考察BTF的长期稳定运行性能及微生物平均代谢活性.结果表明,混合气进口浓度低于910mg/m3时,BTF对VOCs混合废气总去除率可维持在80%以上,BTF可高效同步净化中低浓度VOCs混合废气;当进气负荷>120g/(m3.h)时,去除负荷趋于稳定,为100g/(m3.h)左右;CO2的生成量与混合废气的去除负荷的比值为1.731,表明BTF对此3种混合废气有较高程度的矿化;BTF对甲苯、甲醇、丙烯酸乙酯的降解行为符合Michaelis-Menten动力学模型,单位体积最大降解速率rmax分别是为90.9,50.5,58.5 g/(m3.h).平均吸光度(AWCD)值分析结果表明塔内微生物具有较高的代谢活性.

Biotrickling filter（BTF） inoculated with the acclimated sludge was established to treat a mixture of volatile organic compounds（VOCs） including toluene,methanol,ethyl acrylate.BTF’s performance and metabolic activity of biofilm were investigated within the long-term operation period.BTF could remove more than 80% of VOCs mixture under the conditions of 910 mg/m3 inlet concentrations.Therefore,BTF could treat low-and moderate-concentration waste gases containing toluene,methanol and ethyl acrylate efficiently and simultaneously.The overall elimination capacity reached 100 g/（m3.h） at inlet loads of 120 g/（m3.h）.The mass ratio of carbon dioxide produced to VOCs removed was approximately 1.731,indicating complete degradation of VOCs mixtures.The degradation of toluene,methanol and ethyl acrylate in the BTF followed Michaelis-Menten kinetic model.The maximum specific degradation rate（rmax） was 90.9,50.5 and 58.5 g/（m3.h）,respectively.The average well color development（AWCD）values indicated that the biofilm inhibating in the BTF showed high microbial metabolic activity.