OuyangYun,LiuYuan,ZhongLinjiang.Role of the Corrosion of Magnesium Anode in Driving Phosphorus Recovery from Urine under Different Water Quality[J].China Water & Wastewater,2026,42(17):12-19.
Role of the Corrosion of Magnesium Anode in Driving Phosphorus Recovery from Urine under Different Water Quality
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第42卷
Number:
第17期
Page:
12-19
Column:
Date of publication:
2026-09-01
- Keywords:
- phosphorus recovery; source-separated urine; magnesium anode; phosphorus-containing products; magnesium-air fuel cell
- Abstract:
- The corrosion behavior of the magnesium anode has a significant impact on the performance of the magnesium-air fuel cell (MAFC) which can simultaneously recover phosphorus (P) resources and generate electricity from urine. To reveal the evolution patterns of magnesium anode corrosion behavior, this study primarily investigates the influence mechanisms of varying water quality conditions, particularly changes in nutrient concentration, on the anode corrosion process. The results indicated that, under different influent water quality conditions, there were significant differences in the density of the corrosion film formed on the anode surface, which in turn influenced the release of magnesium ions and jointly regulated the P recovery efficiency of the system. When the molar ratios of P to chlorine in the influent were 0.44 and 0.33 respectively, the continuous crystallization of P-containing products reduced mass transfer efficiency at the anode interface, the corresponding maximum P removal rates were 6.71 mg/(L·min) and 7.17 mg/(L·min), respectively. When the P concentration in the influent was reduced to 50% of that in the original formulation, the process of mass transfer at the anode interface was improved, resulting in the release of magnesium ions to better match the kinetics of the precipitation reaction and the maximum P removal rate to be increased to 8.38 mg/(L·min). The polarisation test results indicated that the peak power density of the MAFC gradually increased as the P concentration in the influent decreased. At a minimum P concentration of 183.90 mg/L in the inflow, the peak power density was 11.60% higher than that of P-free conditions. This study reveals the coupling relationship between the evolution of the magnesium anode interface and P recovery performance in MAFC systems, providing a theoretical basis for elucidation of the mechanisms and the operation optimization of MAFCs.
Last Update:
2026-09-01