真菌过滤塔净化含苯、甲苯废气影响因素的研究

利用2段可调温式生物过滤塔,以真菌为降解菌,研究了入口污染物浓度0.9～5.0 g/m3条件下,温度、填料湿度对苯、甲苯废气净化效率的影响.结果表明,当塔内温度在30～40 ℃时,生物塔净化能力较高;其中塔内温度32.8℃时,微生物对苯和甲苯的净化能力最高,在该温度下,当苯、甲苯入口负荷分别为673.5和665.0 g/(m3·h)时,过滤塔的最大去除负荷分别为136和150 g/(m3·h).试验研究了填料湿度对净化能力的影响,结果表明,高填料湿度不利于真菌过滤塔对苯和甲苯的净化,本试验的最佳填料湿度是45%左右,填料湿度在40%～50%范围内,过滤塔表现出较高的净化效率.随着过滤塔的运行,系统压降由挂膜前的18 Pa逐渐上升到后期的39 Pa,渗滤液的颜色也逐渐加深,表明塔内存在生物量积累的问题.

Influence factors of treating waste gas containing benzene and toluene with fungi-biofilter

Used a two-stage bench-scale temperature adjustable biofilter, biological treatment of medium and high concentration waste benzene and toluene vapor was investigated. The inlet vapor concentration (c(i)) was 0.9 - 5.0 g/m3. The results show that the biofilter can obtained good performance at 30 - 40 degrees C, and at 32.8 degrees C for benzene and toluene, the maximum elimination capacity (EC) of 136 g/(m3 x h) and 150 g/(m3 x h) is obtained at an inlet loading of 673.5 g/(m3 x h) and 665.0 g/(m3 x h), respectively. High media moisture is adverse to the biofilter performance. The optimum moisture for the biofilter is about 45% and the biofilter can obtain good performance at the moisture ranging from 40% to 50%. With the biofilter operation, pressure drop is increasing from 18 Pa to 39 Pa and leachate is changing from colorless to yellow, and these phenomena show that bioaccumulation is existent.