(533h) Bench-Scale Testing of Electrochemical Recovery of Phosphorus from Post-Digester Municipal Wastewater Driven By Magnesium Salt
AIChE Annual Meeting
2022 Annual Meeting
Poster Session: Environmental Division
Wednesday, November 16, 2022 - 3:30pm to 5:00pm
This research study focuses on recovering phosphorus as struvite (or a mixed-phase solid) from post-digester municipal wastewater using an electrochemical technology. The electrochemical technique adopted provides localized pH control which is necessary for struvite formation through oxygen reduction at the cathode. This approach also aims to achieve a process that enables easy automation with little or no human intervention. Belarbi et al. investigated the impact of the presence of other dissolved species specifically Ca2+ in wastewater and how it can alter the chemistry of struvite precipitation . This provided insight into negating the effect of this competing ion by increasing the concentration of magnesium in the wastewater in addition to other major ions in this stream including Na+, K+, SO42- and Cl-. In a bid to potentially recover phosphorus as struvite in this study, magnesium will be supplemented by the introduction of magnesium salt.
The effect of the available surface area of the working electrode, flow turbulence, applied potential, and dissolved oxygen present will be investigated. Also, the percentage recovery of phosphorus as struvite will be determined while analyzing it using various characterization techniques such as scanning electron microscope, Energy-dispersive X-ray spectroscopy, Raman spectroscopy, and X-Ray Diffraction.
- Cornel, P., & Schaum, C., âPhosphorus recovery from wastewater: needs, technologies and costsâ Water Science and Technology, 59(6), 1069â1076, 2009.
- LÃ¡szlÃ³ KÃ©kedy-Nagy, Leah English, Zahra Anari, Mojtaba Abolhassani, Bruno G. Pollet, Jennie Popp, Lauren F. Greenlee, âElectrochemical nutrient removal from natural wastewater sources and its impact on water qualityâ Water Research, 210, 2022.
- Arseto Yekti Bagastyo, Anita Dwi Anggrainy, Khoiruddin Khoiruddin, Riang Ursada, IDAA Warmadewanthi, I Gede Wenten, âElectrochemically-driven struvite recovery: Prospect and challenges for the application of magnesium sacrificial anodeâ Separation and Purification Technology, vol. 288, 2022.
- Z. Belarbi, D. Daramola and J. P. Trembly, âBench-Scale Demonstration and Thermodynamic Simulations of Electrochemical Nutrient Reduction in Wastewater via Recovery as Struviteâ J. Electrochem. Soc., vol. 167, no. 4, Nov. 2020.