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.
水质差异下镁阳极腐蚀驱动尿液中磷回收机制
- Title:
- Role of the Corrosion of Magnesium Anode in Driving Phosphorus Recovery from Urine under Different Water Quality
- Keywords:
- phosphorus recovery; source-separated urine; magnesium anode; phosphorus-containing products; magnesium-air fuel cell
- 摘要:
- 镁-空气燃料电池（MAFC）在利用尿液同步实现磷资源回收与电能输出过程中，镁阳极的腐蚀行为对系统运行性能具有重要影响。为揭示镁阳极腐蚀行为的演化规律，本研究重点考察了不同水质条件，尤其是营养盐浓度变化对阳极腐蚀过程的影响机制。结果表明，不同进水水质条件下，阳极表面形成的腐蚀膜层致密程度存在显著差异，进而影响镁离子的释放行为，并协同调控体系的磷回收效率。当进水中磷与氯的物质的量之比分别为0.44和0.33时，含磷沉淀产物的持续结晶削弱了阳极界面的传质效率，对应的最高磷去除速率分别为6.71和7.17 mg/（L?min）。当进水磷浓度降低至原始配方的50%后，阳极界面传质条件得到改善，镁释放过程与沉淀反应动力学实现更优匹配，最高磷去除速率提升至8.38 mg/（L?min）。极化测试结果表明，随着进水磷浓度降低，MAFC的峰值功率密度逐渐提高，在最低磷浓度为183.90 mg/L的条件下，其峰值功率密度较无磷条件提高11.60%。本研究揭示了MAFC体系中镁阳极界面演化与磷回收性能之间的耦合关系，可为MAFC的机制解析与运行优化提供理论依据。
- 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.
相似文献/References:
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HU De-xiu,ZHANG Cong,ZHANG Yan.Phosphorus Release from Sludge Enhanced by Ultrasound and Optimization of Phosphorus Recovery by Magnesium Ammonium Phosphate Method[J].China Water & Wastewater,2020,36(17):65.
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[3]吴玲予,李大鹏,曲思彤,等.污水中回收P-nCaO2-BFS协同有机酸对植物生长影响[J].中国给水排水,2024,40(19):9.
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