A study on the PP hollow fiber membrane contactor and its performance for removing ammonia from wastewater or mixed gas: II. Ammonia removal from mixed gas

In this paper, we briefly discussed the utilization of the PP HFM contactor for removal of gaseous ammonia directly from mixed gas in ammonia manufacture in order to find an economic way to substitute conventional soft-water washing absorption technology. The Hollow Fiber Membrane (HFM) contactor has very high elimination (99.9%) under optimum operation conditions. 5.1 Nm³/(m².h) gas treatment ability can be achieved, as outlet and inlet ammonia concentration are 0.02 g/Nm³ and 20.0 g/Nm³ respectively and gas stay-time in the contactor is only 0.04 s when acid supply around the membrane is sufficient. The results of industrial tests indicated that this technology could be used to eliminate mixed gas containing ammonia and replace conventional soft-water washing and absorption techniques.