The Simultaneous Efficient Recovery of Ammonia Nitrogen and Phosphate Resources in the Form of Struvite: Optimization and Potential Applications for the Electrochemical Reduction of NO[sub.3][sup.−]

• Published in: Molecules (Basel, Switzerland) Switzerland), 2024-05, Vol.29 (10)
• Main Authors: Li, Liping, Bi, Jingtao, Sun, Mengmeng, Wang, Shizhao, Guo, Xiaofu, Li, Fei, Liu, Jie, Zhao, Yingying
• Format: Article
• Language: English
• Subjects: Ammonia; Aquatic resources; China; Management; Nitrates; Phosphates; Water; Water, Underground
• ISSN: 1420-3049; 1420-3049
• DOI: 10.3390/molecules29102185

In response to the need for improvement in the utilization of ammonium-rich solutions after the electrochemical reduction of nitrate (NO[sub.3] [sup.−]–RR), this study combined phosphorus-containing wastewater and adopted the electrochemical precipitation method for the preparation of struvite (MAP) to simultaneously recover nitrogen and phosphorus resources. At a current density of 5 mA·cm[sup.−2] and an initial solution pH of 7.0, the recovery efficiencies for nitrogen and phosphorus can reach 47.15% and 88.66%, respectively. Under various experimental conditions, the generated struvite (MgNH[sub.4]PO[sub.4]·6H[sub.2]O) exhibits a typical long prismatic structure. In solutions containing nitrate and nitrite, the coexisting ions have no significant effect on the final product, struvite. Finally, the characterization of the precipitate product by X-ray diffraction (XRD) revealed that its main component is struvite, with a high purity reaching 93.24%. Overall, this system can effectively recover ammonium nitrogen from the NO[sub.3] [sup.−]–RR solution system after nitrate reduction, with certain application prospects for the recovery of ammonium nitrogen and phosphate.