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<p>This work first unraveled the response mechanism of marine anammox bacteria (MAB)-dominated anammox process to Zn(II) in treating saline wastewater. Low Zn(II) doses (⩽ 3 mg/L) enhanced MAB activity, with the highest total nitrogen removal rate (TNRR) of 1.33 kg/(m<sup>3</sup>·d) achieved at 3 mg/L Zn(II). Additionally, the relative abundance of MAB (<i>Candidatus</i> Scalindua) sharply increased from 9.2% to 46.1%. It further increased to 53.0% at 5 mg/L Zn(II), even though TNRR collapsed to 0.22 kg/(m<sup>3</sup>·d). Furthermore, the production of nitrite reductase, nitrate reductase and hydrazine dehydrogenase was stimulated, with enzymatic activity and heme c content first increasing and then decreasing, reaching the maximum at 3 mg/L Zn(II). More extracellular polymeric substances were also secreted to resist high Zn(II) doses (⩾ 4 mg/L) stress. This work clearly demonstrated that the addition of appropriate doses of Zn(II) is an effective strategy to stimulate MAB activity in the treatment of saline wastewater.</p>

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A holistic analysis of marine anammox bacteria-dominated anammox respond to Zn(II) in saline wastewater treatment: from bio-stimulation to rapid collapse

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • Weichuan Kong,
  • Dan Wang,
  • Xiaocui Wang,
  • Yanling Qiu,
  • Jin Li

摘要

This work first unraveled the response mechanism of marine anammox bacteria (MAB)-dominated anammox process to Zn(II) in treating saline wastewater. Low Zn(II) doses (⩽ 3 mg/L) enhanced MAB activity, with the highest total nitrogen removal rate (TNRR) of 1.33 kg/(m3·d) achieved at 3 mg/L Zn(II). Additionally, the relative abundance of MAB (Candidatus Scalindua) sharply increased from 9.2% to 46.1%. It further increased to 53.0% at 5 mg/L Zn(II), even though TNRR collapsed to 0.22 kg/(m3·d). Furthermore, the production of nitrite reductase, nitrate reductase and hydrazine dehydrogenase was stimulated, with enzymatic activity and heme c content first increasing and then decreasing, reaching the maximum at 3 mg/L Zn(II). More extracellular polymeric substances were also secreted to resist high Zn(II) doses (⩾ 4 mg/L) stress. This work clearly demonstrated that the addition of appropriate doses of Zn(II) is an effective strategy to stimulate MAB activity in the treatment of saline wastewater.