UNSW Water Research Centre, School of Civil and Environmental Engineering , University of New South Wales , Sydney , New South Wales 2052 , Australia.
College of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse , Tongji University , Shanghai , 200092 , P. R. China.
Environ Sci Technol. 2018 Dec 18;52(24):14275-14285. doi: 10.1021/acs.est.8b02743. Epub 2018 Dec 4.
We have previously described a novel flow-electrode capacitive deionization (FCDI) unit combined with a hydrophobic gas-permeable hollow fiber membrane contactor (designated "CapAmm") and presented results showing efficient recovery of ammonia from dilute synthetic wastewaters (Zhang et al., Environ. Sci. Technol. Lett. 2018, 5, 43-49). We extend this earlier study here with description of an FCDI system with integrated flat sheet gas permeable membrane with comprehensive assessment of ammonia recovery performance from both dilute and concentrated wastewaters. The integrated CapAmm cell exhibited excellent ammonia removal and recovery efficiencies (up to ∼90% and ∼80% respectively). The energy consumptions for ammonia recovery from low-strength (i.e., domestic) and high-strength (i.e., synthetic urine) wastewaters were 20.4 kWh kg N and 7.8 kWh kg N, respectively, with these values comparable to those of more conventional alternatives. Stable ammonia recovery and salt removal performance was achieved over more than two days of continuous operation with ammonia concentrated by ∼80 times that of the feed stream. These results demonstrate that the integrated CapAmm system described here could be a cost-effective technology capable of treating wastewaters and realizing both nutrient recovery and water reclamation in a sustainable manner.
我们之前描述了一种新型的流动电极电容去离子（FCDI）单元，该单元与疏水性透气中空纤维膜接触器（命名为“CapAmm”）相结合，并展示了从稀合成废水中有效回收氨的结果（Zhang 等人，环境科学与技术快报 2018 年，5，43-49）。在这里，我们扩展了之前的研究，描述了一个具有集成平板透气膜的 FCDI 系统，并对从稀废水和浓废水回收氨的性能进行了全面评估。集成的 CapAmm 电池表现出优异的氨去除和回收效率（分别高达约 90%和 80%）。从低强度（即家庭）和高强度（即合成尿液）废水中回收氨的能耗分别为 20.4 kWh kg N 和 7.8 kWh kg N，这些值与更传统的替代方案相当。在连续运行两天以上的时间内，氨的浓缩倍数达到进料流的约 80 倍，实现了稳定的氨回收和盐去除性能。这些结果表明，这里描述的集成 CapAmm 系统可以成为一种具有成本效益的技术，能够以可持续的方式处理废水，并实现养分回收和水的再利用。
