Vacuum membrane distillation multi-component numerical model for ammonia recovery from liquid streams

摘要: Abstract In this work, a modelling research on the separation of ammonia gas from liquid streams via vacuum membrane distillation (VMD) is conducted. An experimentally validated multi-component simulation model flat sheet VMD module developed by implementing heat and mass balances through feed, permeate channels. Continuous removal gases transferred at constant pressure in channel assumed. The transport mechanisms pores under conditions for both volatiles are discussed. Under studied typical concentration range waste waters (i.e. 1-10 g TAN l-1), it observed that none two volatile components (ammonia water) preferentially transported. resulting performance simulated evaluated terms total transmembrane flux, selectivity thermal energy consumption. was showed good agreement, with an average relative error J N H 3 ) ( S ammonia. Increasing feed temperature decreasing results higher but lower . Moreover, those parameters enhance transfer temperature, pore size, porosity, pressure, etc.) promote water flux over While mixing velocity, spacer geometry, pH, concentration, water. only operating parameter which enhances simultaneously indicating geometry can play important role designing modules separation. extract concentrate side low specific However, greatly limited will ultimately determine cost-effectiveness recovery. trends described agreement other authors’ observations give insight into dominating its limits.