新型硅橡胶膜生物反应器用于有机废水处理的膜传质动力学

Kinetics of Mass Transfer through Membrane in the Bioreactor with Novel Silicone Rubber Membrane Modules for Industrial Wastewater Treatment

用中空纤维型硅橡胶管构造了管束式和卷绕式两种膜器，将它们结合进一个生物反应器系统，用于对废水中的挥发性有机化合物（VOC）进行生物降解处理。本文以甲苯为对象，研究了VOC在这种系统中穿过膜的传质问题。基于液-膜-液的串联阻力概念和质量平衡，构造了一个关于膜总传质系数的简单指数模型，用于传质实验的分析。将甲苯溶于水中模拟有机废水，配制适合于甲苯降解细菌生长的培养液，进行了甲苯从废水穿过膜到培养液中的传质实验，并将细菌移植进培养液进行了生物降解条件下的传质实验。对培养液中细菌存在和不存在两种情况下的甲苯传质实验进行了分析。结果表明，总传质系数的指数模型基本上与实验条件符合，所得到的甲苯的总膜传质系数具有10-6m·s-1数量级，卷绕膜器的总传质系数较管束型的稍高，生物反应条件下的总传质系数又较细菌不存在时的稍高。

Two kinds of modules with hollow-fiber and spiral-wound silicone rubber membranes respectively were combined into a bioreactor system used for treatment of the industrial wastewater with volatile organic compounds (VOCs). Mass transfer of VOCs through membranes in the bioreactor was studied by using toluene as an example. The experiments on mass transfer in the bioreactor were carried out for two kinds of culture liquor which were with and without the microorganism for biodegradation of toluene. A simple exponential model, instead of the complicated serial resistance model for the overall mass transfer coefficient, was derived and employed for analyzing the experiments. The experimental results indicated that the exponential model of overall mass transfer coefficient described the mass transfer in the bioreactor quite well. The fitted overall mass transfer coefficient from the experimental data was in an order of 10-6 m·s-1. It was shown that the overall mass transfer coefficient under existence of the microorganism is superior to that under absence of bacteria.