The ammonia recovery from wastewater via electrochemical technologies represents a promising way for wastewater treatment, resource recovery, and carbon emissions reduction. However, chemicals consumption and reactors scalability of the existing electrochemical systems have become the key challenges for their development and application. In this study, a stacked transmembrane electro-chemisorption (sTMECS) system was developed to utilize authigenic acid and base on site for enhancing ammonia recovery from wastewater. The easily scaled up system was achieved via innovatively connecting the cathode chamber in a unit with the anode chamber in the adjacent unit by a hydrophobic gas permeable membrane (GPM). Thus, authigenic base at cathodes and authigenic acid at anodes could be utilized as stripper and absorbent on site to enhance the transmembrane chemisorption of ammonia. Continuous power supply, reducing the distances of electrodes to GPM and moderate aeration of the catholyte could promote ammonia recovery. Applied to the ammonia recovery from the simulated urine, the sTMECS under the current density 62.5 A/cm with a catholyte aeration rate of 3.2 L/(L⋅min) for operation time 4 h showed the transmembrane ammonia flux of 26.00 g N/(m·h) and the system energy consumption of 10.5 kWh/kg N. Accordingly, the developed sTMECS system with chemicals saving, easy scale-up and excellent performance shows good prospects in recovering ammonia from wastewater.

中文翻译：

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由疏水性气体渗透膜连接的堆叠式跨膜电化学吸附系统，用于现场利用自生酸和碱来提高废水中氨的回收率


通过电化学技术从废水中回收氨是废水处理、资源回收和减少碳排放的一种有前景的方法。然而，现有电化学系统的化学品消耗和反应器可扩展性已成为其开发和应用的关键挑战。在这项研究中，开发了一种堆叠式跨膜电化学吸附（sTMECS）系统，可现场利用自生酸和碱来提高废水中氨的回收率。通过疏水性气体渗透膜（GPM）创新地将一个单元中的阴极室与相邻单元中的阳极室连接起来，实现了轻松扩大规模的系统。因此，阴极的自生碱和阳极的自生酸可以用作现场的剥离剂和吸收剂，以增强氨的跨膜化学吸附。连续供电、减少电极与 GPM 的距离以及阴极电解液的适度通气可以促进氨回收。应用于模拟尿液中的氨回收，sTMECS在电流密度为62.5 A/cm、阴极电解液通气率为3.2 L/(L·min)、运行时间为4 h的情况下显示跨膜氨通量为26.00 g N/( m·h），系统能耗为10.5 kWh/kg N。因此，所开发的sTMECS系统具有节省化学品、易于放大、性能优良的特点，在废水中氨回收方面具有良好的前景。