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<p>The biogas slurry obtained from anaerobic digestion of livestock manure contains many nitrogen (N) and phosphorus (P) elements, could cause eutrophication if it was disposed improperly. In this study, N and P in biogas slurry were effectively recovered using a coupled electrochemical struvite crystallization-modified zeolite (ZO) adsorption method. The modified MgCl<sub>2</sub>-ZO, utilizing MgCl<sub>2</sub> as the magnesium source, achieved the highest recovery efficiency. Mg<sup>2+</sup> would be released from the Mg anode and moved towards graphite cathode. Struvite would be formed by Mg<sup>2+</sup>, free NH<sub>4</sub><sup>+</sup> and PO<sub>4</sub><sup>3-</sup> on cathode plate or ZO surface. The optimal actual recovery rates for total nitrogen (TN), total ammoniacal nitrogen (TAN), total phosphorus (TP), and total phosphate (TPS) were 54.839%, 62.925%, 82.017%, and 77.724% were achieved when N/<i>P</i> = 3.777, pH = 8.433, and current density = 13.113&#xa0;A/m², with an adsorbent dosage of 5&#xa0;g/L. The MgCl<sub>2</sub>-ZO still maintained approximately 50% adsorption capacity for N and P after 5 regenerations. High-quality struvite was obtained when the pH of the solution, post acid washing of struvite and ZO, was adjusted to around 10. The study provided technical support and theoretical guidance for deepening the harmless and resource utilization of organic solid waste.</p>

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Coupled Electrochemical Struvite Crystallization-Modified Zeolite Adsorption to Recovery of Nitrogen and Phosphorus in Biogas Slurry

  • 期刊论文

  • 发表日期：

    2025年8月7日

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  • Xiaoliang Luo,
  • Zhigang Li,
  • Yu Gu,
  • Jianan Wu,
  • Mingguo Peng,
  • Wenyi Zhang,
  • Linqiang Mao

摘要

The biogas slurry obtained from anaerobic digestion of livestock manure contains many nitrogen (N) and phosphorus (P) elements, could cause eutrophication if it was disposed improperly. In this study, N and P in biogas slurry were effectively recovered using a coupled electrochemical struvite crystallization-modified zeolite (ZO) adsorption method. The modified MgCl2-ZO, utilizing MgCl2 as the magnesium source, achieved the highest recovery efficiency. Mg2+ would be released from the Mg anode and moved towards graphite cathode. Struvite would be formed by Mg2+, free NH4+ and PO43- on cathode plate or ZO surface. The optimal actual recovery rates for total nitrogen (TN), total ammoniacal nitrogen (TAN), total phosphorus (TP), and total phosphate (TPS) were 54.839%, 62.925%, 82.017%, and 77.724% were achieved when N/P = 3.777, pH = 8.433, and current density = 13.113 A/m², with an adsorbent dosage of 5 g/L. The MgCl2-ZO still maintained approximately 50% adsorption capacity for N and P after 5 regenerations. High-quality struvite was obtained when the pH of the solution, post acid washing of struvite and ZO, was adjusted to around 10. The study provided technical support and theoretical guidance for deepening the harmless and resource utilization of organic solid waste.