净水技术2025，Vol.44Issue(5)：86-97,158,13.DOI:10.15890/j.cnki.jsjs.2025.05.010
鸟粪石电解反应器中电流密度对镁阳极释放镁离子的影响机制——模拟养猪废水处理案例
Influencing Mechanism of Current Density on Release of Magnesium Ions from Magnesium Anode in Struvite Electrolytic Reactor——Case of Simulated Swine Waste water Treatment
摘要
Abstract
[Objective]Phosphorus pollution is one of the main environmental problems in livestock and poultry breeding industry.In order to achieve sustainable development of phosphorus resources,phosphorus recovery from swine wastewater has been widely concerned.[Methods]The experiment was conducted using AZ31B magnesium alloy plates as the anode and TC4 titanium alloy plates as the cathode to construct a struvite electrolytic reactor.Through single-factor experiments,the pH changes in the reaction system,release characteristics of magnesium ions,the phosphorus recovery efficiency,and the electrochemical characteristics of magnesium anode were systematically investigated under different initial current densities.Meanwhile,the morphology and phase of the precipitated products were characterized by scanning electron microscopy(SEM),energy dispersive X-ray spectroscopy(EDS),and X-ray diffraction(XRD).[Results]The result showed that with the increase of current density,the release rate of anode magnesium ions was significantly accelerated,which promoted the precipitation and recovery of phosphate.When the initial pH value was 7.2,the electrode spacing was 5 cm,the electrolytic time was 60 min,and the initial current density was 1.11 mA/cm2,the phosphorus recovery reached 84.5％,and the precipitated product was the struvite crystal with high main diffraction peak intensity and small half-peak width.When the current density increased to 1.67 mA/cm2,the phosphorus recovery rate increased to 92.4％,and the precipitated product was the struvite crystal with weak main diffraction peak intensity and small half-peak width.When the current density reached 2.22 mA/cm2,the phosphorus recovery rate was only slightly increased to 92.72％,but the precipitated products were transformed into non-struvite magnesium phosphorus compounds.This indicated that high current density may lead to changes in the reaction mechanism of the electrode surface and adverse effect on stability and crystallization process of struvite.[Conclusion]The research result can provide important theoretical basis and technical guidance for the recovery and utilization of phosphorus resources in swine wastewater,and provide key parameters for the design and optimization of electrochemical struvite precipitation reactor,so as to promote resource recycling and environmental sustainable development.关键词
电化学/电解反应器/镁阳极/鸟粪石/磷回收Key words
electrochemistry/electrolytic reactor/magnesium anode/struvite/phosphorus recovery分类
资源环境引用本文复制引用
吴兴隆,金锦铭,陈力,董溁,黄鑫语,王芳..鸟粪石电解反应器中电流密度对镁阳极释放镁离子的影响机制——模拟养猪废水处理案例[J].净水技术,2025,44(5):86-97,158,13.基金项目
湖北省自然科学基金计划联合基金项目(2023AFD088) （2023AFD088）
湖北省教育厅科学技术研究项目(Q20221902) （Q20221902）
高水平科研成果校内培育项目(PY22007) （PY22007）
湖北民族大学大学生创新创业训练计划项目(S202310517020) （S202310517020）
