中空纤维膜生物反应器处理VOCs废气

Experimental Study on Treatment of VOCs by Hollow Fiber Membrane Bioreactor

采用聚偏氟乙烯(PVDF)中空纤维膜生物反应器(HFMBR)对二甲苯、乙酸乙酯单一废气以及复合废气的净化性能进行了研究。结果表明:HFMBR处理单一气态污染物,气体停留时间t控制为10 s,二甲苯进口浓度为1 882 mg/m3时,降解效率(RE)为69%,最大生化降解量ECmax为469.7 g/(m3·h);而乙酸乙酯进口浓度为1 944 mg/m3时,RE为80%,ECmax为559.9 g/(m3·h)。HFMBR处理复合废气,气体停留时间t控制为10 s,复合气体中二甲苯、乙酸乙酯浓度各为1 920 mg/m3、2 017 mg/m3时,二甲苯RE仅为44%,ECmax下降至301.1 g/(m3·h);而乙酸乙酯的RE为70%,ECmax仍高达509.7 g/(m3·h)。高浓度乙酸乙酯的存在对二甲苯产生了抑制作用,而二甲苯几乎不对乙酸乙酯产生影响。

A bench scale hollow fiber membrane bioreactor （HFMBR） was used to remove xylene, ethyl acetate or both from gaseous waste. The experimental results showed that when treating the pollutant singly, the maximum elimination capacity in terms of EC and removing efficiency for xylene was 469.7 g/（m3·h） and 69%, and for ethyl acetate 559.9 g/（m3·h） and 80% on condition of gas residence time 10 s and initial inlet concentrations of xylene and ethyl acetate： 1 882 mg/m3 and 1 944 mg/m3 respectively. On the other hand, for the mixture of xylene and ethyl acetate, the maximum elimination capacity of xylene and ethyl acetate decreased to 301.1 g/（m3·h）（removal efficiency 44%） and 509.7 g/（m3·h）（removal efficiency 70% ） respectively, and inlet gas concentrations were kept at 1 920 mg/m3 for xylene and 2 017 mg/m3 for ethyl acetate, which suggested that presence of high concentration ethyl acetate inhibited the removal of xylene, while xylene could hardly be affected by ethyl acetate.