Enhanced ammonia resource recovery from wastewater using a novel flat sheet gas-permeable membrane

摘要

Total ammonia nitrogen (TAN) is a significant sign of the polluted water body and harms the aquatic environment. In order to enhance ammonia resource recovery and simultaneously treat the wastewater, a novel flat sheet gas-permeable membranes (GPMs) were prepared by paper-making and hot-press forming process sequentially. Because of an excellent balanced performance, the GPM-3 was selected as the core functional component for the flat sheet GPM modules. Results demonstrated that the optimal TAN recovery rate (75.9%) of this contactor could be achieved at pH value 11, temperature 30 degrees C, stirring speed 150 rpm and flow velocity 7 m/min after 6h reaction, wherein, the overall mass transfer coefficient (K-OV) reached 1.24 x 10(-5) m/s. The promotion mechanism of K-OV was revealed with the ammonia mass transfer theory. In a real-life application experiment, the results indicated that the high-quality (NH4)(2)SO4 salt was recovered from the landfill leachate, which simultaneously enhanced the wastewater treatment. All of the above results manifested that the novel flat sheet GPM is an innovative and realistic separation medium for enhancing ammonia resource recovery because of its efficient and prominent antifouling properties.