生物滴滤池净化二氯甲烷废气的实验研究

在φ50mm生物滴滤池内进行了二氯甲烷废气净化的实验研究.由工厂活性污泥经驯化培养得到菌种,进一步接种、在填料表面挂膜,接种和挂膜约需30d.滴滤池内装填聚丙烯散堆填料,废气和循环液在滴滤池内逆流操作,循环液pH值为7.0±0.5,温度维持在28.5±2℃的条件下,生物膜系统能较好地适应进口浓度的变化.在气体空床停留时间为15.7s、二氯甲烷进口浓度为0.7～3.12g/m³的范围内,去除效率为72.0%～99.1%.滴滤池中的酸性环境对二氯甲烷的降解具有明显抑制作用.

Purification of Dichloromethane Waste Gas in a Biotrickling Filter

An experimental investigation on purification of dichloromethane waste gas was conducted in a 50 mm diameter biotrickling filter packed with randomly-stacked polypropylene. A heterotrophic population was acclimated from facility's secondary sludge, and was further inoculated over the surface of the packing. The inoculation process lasted about 30 days, and then a biofilm was developed. The counter-current operation was carried out in the filter. The pH and temperature of the circulating liquid were controlled as 7.0 +/- 0.5 and 28.5 +/- 2 degrees C respectively. The biofilm system was well accommodative to the fluctuation of operating conditions. When the concentration of dichloromethane was in the range of 0.7 to 3.12 g/m3, and the gas empty-bed residence time was 15.7 s, the removal efficiency of 72.0 to 99.1% could be achieved. It was also showed that the acid environment in the filter could refrain the degradation of dichloromethane.