汽油添加剂甲基叔丁基醚（MTBE）的污染在国外已引起重视。概述了目前MTBE生物降解的研究现状，着重介绍了国外对MTBE污染地下水的异位和原位生物处理方法。随着汽车的逐步普及和MTBE用量的增加，我国正在或将面临MTBE的污染。指出了开展相关研究的重要性和迫切性，初步提出了这一新课题的研究思路，为我国环境保护领域从事该项研究的人员提供参考。

以液滴离开塔板的初始位置为边缘分布、液滴粒径为条件分布。用概率统计的方法来描述旋流塔板上液滴群运动的边界条件．进而提出其三维模型。该模型不含可调参数，采用四阶Runge-Kutta法计算，结果得到实验的支持。

通过驯化、筛选和富集培养，从制药厂（Y）和农药厂（N）生化曝气池的活性污泥中分离到2株能以二氯甲烷为唯一碳源和能源而生长的菌株。菌种初步鉴定为假单胞杆菌属和放线菌科分枝杆菌属。由正交试验得出GD11、GD23两株菌的最适培养条件：GD11温度28.5℃，pH值6.0，纱布层数6；GD23温度25℃，pH值7.2，纱布层数4。研究发现NaCl浓度对菌株的降解率有不同程度的抑制作用。

The effects of inlet gas concentration and gas flow-rate on the NO elimination process were studied in a laboratory-scale biofilter and the removal process is discussed. Various pollutant inlet concentrations and gas flow-rates were tested in the biofilter. The results showed that the removal efficiency increased with increase in the empty bed residence time (EBRT) and finally reached a steady state. The mass transfer process became the limiting step of NO removal when the EBRT was less than 2min. A removal efficiency of～73% was obtained in the biofilter at an inlet concentration of 107.1mgm−3. The removal efficiency decreased with increase in inlet concentration, whereas the removal capacity increased. The removal process consisted of chemical oxidation and bio-nitrification in the biofilter. The bioprocess mainly contributed to the removal.

Based on the results of gas flow field, droplet size distribution and droplet initial flow rate distribution on aф300mm rotating stream tray (RST), a three dimensional droplet projection trajectory model and a mass transfer efficiency model were developed. The calculation of the models was carried out by using a finite-difference procedure1 The predicted results of the plate efficiency agreed quite well with the experimental data measured with absorbing NH3 or SO2 on aф300mm RST and the operation data from a commercial ф3600mm RST column1 Meanwhile, the effect of gas-liquid system and RST's structure on plate efficiency was discussed.