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.

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。