生物滴滤器处理高温甲苯废气的探讨

以甲苯为目标污染物,设计可控温的双塔生物滴滤器为净化装置,考察了高温条件下挥发性有机物的生物处理性能,镜检确定了高温条件下降解甲苯的优势菌种。结果表明:(1)液相驯化菌种对气相甲苯适应性较差,挂膜120～140h可形成稳定的生物膜;(2)随甲苯废气温度升高,甲苯去除效率下降,40℃效率最高,60℃仍有一定的去除能力;(3)短杆菌和球形菌为降解甲苯的优势菌种,球形菌是高温优势菌;(4)温度高于40℃时降解产物中检测到有机中间产物。

INVESTIGATION ON PURIFYING TOLUENE WASTE GAS IN BIOTRICKLING FILTERS UNDER THERMOPHILIC CONDITIONS

The objectives of this research were to investigate the potential to biologically treat toluene waste gas at thermophilic conditions and to examine the dominant strains to degrade toluene at high temperatures.The results showed that the dominant strains had poor adaptation to toluene(gas) after cultured in toluene(liquid).The biofilm formed in packing of a biotrickling filter(BTF) tend to stabilization after 120 h～140 h.The removal efficiency was highest at 40 ℃,and then at 30 ℃,50 ℃,60 ℃.The average removal efficiency were 82.7%,74.8%,59.5% and 55.9%.The dominant strain was bacillus and ball bacterium,of which the bacillus grew easier on the packing,but ball bacterium had good adaptation under thermophilic condition.New by-product was found when the temperature was above 40 ℃.