【摘要】 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.更多还原

【Abstract】 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/m~3).The results show that the biofilter can obtained good performance at 30～40℃,and at 32.8℃ for benzene and toluene,the maximum elimination capacity(EC) of 136 (g/(m~3·h)) and 150 (g/(m~3·h)) is obtained at an inlet loading of 673.5 (g/(m~3·h)) and 665.0 (g/(m~3·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.更多还原