不同挂膜方式生物滴滤塔处理含H2S恶臭气体

采用菌剂挂膜，活性污泥挂膜和自然挂膜3种不同方式形成生物滴滤塔，考察挂膜方式对生物滴滤塔去除H2s恶臭气体的影响。结果表明，当进气H2S浓度为5mg／m3时，菌剂挂膜、活性污泥挂膜、自然挂膜形成的生物滴滤塔出气H2s浓度分别为15．7～17．4、11．6～14．8和15．0～15．9μg／m3；塔内压降分别为3—4mm水柱、6mm水柱和4—5mm水柱；喷淋后滤出液中硫酸根的浓度分别为14、22和17mg／L，硫的转化率分别为45％、60％和50％。当进气H2S浓度增大至7mg／m3时，3个塔经过7d的调整后，均能达到稳定状态，稳定后3个塔中出气H2s浓度和压降基本没变，喷淋后滤出液中硫酸根浓度依次增大至25、31和30mg／L左右。采用活性污泥挂膜形成的生物滴滤塔处理H2s的能力比菌剂挂膜和自然挂膜的高。

Removal of hydrogen sulfide by bio-trickling filter with different modes of biofilm formation

The removal of H2S from waste gas was investigated in bio-trickling filters with start-up modes of bacterium culturing, activated sludge culturing and natural culturing, respectively. The results showed that, with the inlet HES concentration of 5 mg/m3 , the outlet HES concentrations for bio-trickling filters of bacterium cultu- ring, activated sludge culturing and natural culturing were 15.7 -17.4μg/m3 , 11.6-14.8 μg/m3 and 15.0 - 15.9μg/m3 , respectively. During the experiments, the pressure drops of gas in packed bed were respectively 3 4 ram, 6 mm and 4 -5 mm water for three start-up modes mentioned above. The concentrations of sulfate in spraying liquid discharged from the column bottom were 14 mg/L, 22 mg/L and 17 mg/L, respectively, while the conversion of the sulfur were 45% , 60% and 50% , respectively. When increasing the inlet H2S concentra- tion to 7 mg/m3 , three bio-trickling filters were able to reach steady states after continuously running a week. During the steady-state period, no obvious changes of the outlet n2S concentration and pressure drop were found in the three bio-trickling filters, while the sulfate concentrations in discharged spraying liquid increased to 25 mg/L, 31 mg/L and 30 mg/L, respectively. It is found that the removal efficiency of HES in the bio-trickling fil- ter with activated sludge culturing was higher than that in the bio-trickling filters with bacterium culturing and natural culturing, respectively.