To advance nutrient recovery from waste streams by electrodialysis (ED), a decoupled ED system with separated anode/cathode units was developed in this study. The use of an additional cation exchange membrane in the anode unit was designed to prevent chloride oxidation and collect phosphate at a higher concentration. The results show that the decoupled ED removed 92 ± 2% of ammonia and 81 ± 3% of phosphate from a synthetic solution, or 75 ± 4% (ammonia) and 62 ± 2% (phosphate) from a real centrate. Both current generation and nutrient removal could be improved with increasing the applied voltage from 3 to 5 V, and a higher voltage of 6 V did not pose positive effects on removal efficiency but resulted in higher energy consumption. A shorter electrodes distance benefited the decoupled ED operation with a lower internal resistance. The solar energy was successfully applied to power the decoupled ED that exhibited comparable performance (removing 74 ± 4% of ammonia and 60 ± 2% of phosphate) to that by a power supply, although the use of solar energy would depend on the illumination condition. The quality of the recovered struvite was enhanced by either a pre-treatment step to precipitate calcium ions or using a small quantity of the catholyte for struvite formation. These results have demonstrated a promising approach to recover nutrients from sidestream centrate as struvite and ammonium sulfate, encouraging further exploration of ED application towards enhancing flexibility and utilizing clean energy.

为了通过电渗析（ED）促进废物流中养分的回收，在本研究中开发了具有分离的阳极/阴极单元的去耦ED系统。设计在阳极单元中使用额外的阳离子交换膜可防止氯化物氧化并以更高的浓度收集磷酸盐。结果表明，解耦的ED从合成溶液中去除了92±2％的氨和81±3％的磷酸盐，或从真实浓缩物中去除了75±4％（氨）和62±2％（磷酸盐）。通过将施加的电压从3 V增加到5 V可以改善电流产生和营养去除，并且6 V的较高电压不会对去除效率产生积极影响，但会导致更高的能耗。较短的电极距离有利于去耦ED操作，并具有较低的内部电阻。尽管太阳能的使用取决于照明条件，但太阳能已成功应用于为解耦的ED供电，该ED表现出与电源相当的性能（除去74±4％的氨和60±2％的磷酸盐） 。通过预处理步骤使钙离子沉淀或使用少量阴极电解液形成鸟粪石，可以提高回收的鸟粪石的质量。这些结果表明，从侧流浓缩物中以鸟粪石和硫酸铵形式回收营养物的方法很有前景，这鼓励了对ED应用的进一步探索，以提高灵活性和利用清洁能源。尽管太阳能的使用将取决于照明条件。通过预处理步骤使钙离子沉淀或使用少量阴极电解液形成鸟粪石，可以提高回收的鸟粪石的质量。这些结果证明了从侧流浓缩物中以鸟粪石和硫酸铵形式回收营养物的一种有前途的方法，这鼓励了对ED应用的进一步探索，以提高灵活性和利用清洁能源。尽管太阳能的使用将取决于照明条件。通过预处理步骤使钙离子沉淀或使用少量阴极电解液形成鸟粪石，可以提高回收的鸟粪石的质量。这些结果证明了从侧流浓缩物中以鸟粪石和硫酸铵形式回收营养物的一种有前途的方法，鼓励进一步探索ED的应用，以提高灵活性和利用清洁能源。