生物滴滤法净化低浓度甲苯气体的研究

Research of Purification of Low Concentrated Toluene Waste Gas in Biotrickling Filter

以拉西环为生物滴滤塔填料,低浓度甲苯为VOCs代表,研究生物滴滤塔对低浓度甲苯气体的净化性能及其影响因素,分析了不同进气浓度和停留时间下生物滴滤塔对低浓度甲苯气体的净化性能.结果表明,实验范围内净化效率随进气甲苯浓度的增大而减小,生化去除量则随进气甲苯浓度的增大增大.停留时间越长,净化效率越大.菌落分析表明,短杆菌为优势菌种,假单胞菌属中的短杆菌对甲苯有很强的生物降解能力.表观气速为143m·h-1,甲苯的生化去除量维持在62.4g·m-3h-1以上,最大可达190.7g·m-3h-1,优于国内学者的研究成果;进气甲苯浓度为184mg·m-3时,净化效率高达92%.且当气体停留时间从9.752s增加到29.256s时,净化效率从61.98%提高到80.66%.

This research employed Rasching ring as the packing material of biotrickling filter and took toluene waste gas of low concentration as representative of VOCs pollutants. The results showed that the biotrickling filter could effectively remove toluene from waste gas under experimental conditions. The observation of biotic community demonstrated that bacteria is dominant the microbibal culture. The removal efficiency declines and the eliminate capacity improves as the inlet concentration increases, the removal efficiency is 92% when the inlet concentration is 184 mg ·m^-3 and the eliminate capacity is from 62.4 g · m^-3h^-1 to 190. 7 g · m^-3 h^-1. When the hold time got from 9. 752 s up to 29. 256 s, the removal efficiency improved from 61.98% to 80.66%.