Aerobic degradation of nitrobenzene by immobilization of Rhodotorula mucilaginosa in polyurethane foam

Rhodotorula mucilaginosa Z1 capable of degrading nitrobenzene was immobilized in polyurethane foam. The nitrobenzene-degrading capacity of immobilized cells was compared to free cells in batches in shaken culture. Effects of pH and temperature on the nitrobenzene degradation showed that polyurethane-immobilized Z1 had higher tolerances toward acid, alkali, and heat than those of free cells. Kinetic studies revealed that higher concentrations of nitrobenzene were better tolerated and more quickly degraded by polyurethane-immobilized Z1 than by free cells. Moreover, the ability of polyurethane-immobilized Z1 to resist nitrobenzene shock load was enhanced. Experiments on the nitrobenzene degradation in different concentrations of NaCl and in the presence of phenol or aniline demonstrated that polyurethane-immobilized Z1 exhibited higher tolerance toward salinity and toxic chemicals than those of free cells. Immobilization therefore could be a promising method for treating nitrobenzene industrial wastewater. This is the first report on the degradation of nitrobenzene by a polyurethane-immobilized yeast strain.     

掺杂V_2O_3系PTC陶瓷中金属相的研究

报导在掺杂Ｖ＿２Ｏ＿３系ＰＴＣ陶瓷中引入Ｆｅ金属相，采用ＸＲＤ，ＳＥＭ分析技术确定Ｆｅ金属相在材料中的结构状态，并结合材料ＰＴＣ性能测试结果讨论了Ｆｅ金属相对材料烧结性能和ＰＴＣ性能的影响。     

活化炉的多变量解耦控制研究

活化炉是利用褐煤制备活性炭工艺过程中的一个重要设备 ,其温度是影响活性炭质量与产量的重要参量。针对活化炉是一个多变量强耦合系统 ,本文在分析活化炉特性并获其动态模型的基础上 ,重点进行了多变量预测控制的仿真研究 ,并与传统的带解耦PID控制相比 ,得出多变量预测控制具有良好的解耦控制品质 ,其研究结果为实施活化炉的计算机控制奠定了理论基础。