Research Progress and Enhancement of MDC Process

摘要: Membrane distillation-crystallization (MDC) is an appropriate process which can completely recover solutes and solvents from high concentration brine under modest operation conditions, no emissions system into the environment. In present article, factors restricting development of membrane such as performance material mass transfer/transfer efficiency were introduced, enhancement sediment control measures crystallization reviewed. To reinforce heat transfer in hollow fiber distillation-crystallization, bubbles suggested to be added feed side format gas-liquid two-phase flow. The secondary flow generated by bubble would not only substantially increase maximum shear stress on surfaces, prevent deposition pollutants, but also could effectively reduce boundary layer polarization phenomena at same time. And most importantly, become nucleus for crystal generation supersaturated solution, are easily detached solution.