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<p><i>Microcystis aeruginosa,</i> a common cyanobacterium in freshwater ecosystems, releases harmful microcystin and algal organic matter, posing serious risks to aquatic ecosystems and water quality. This study aimed to identify effective biological approaches for the removal of <i>M. aeruginosa</i> and to optimize the operational control conditions. Five aquatic animals: <i>Paramecium caudatum</i><i>, </i><i>Daphnia magna, Macrobranchium nipponense, Bellamya aeruginosa, Unio douglasiae</i> were selected to investigate their individual and combined effect on the removal of <i>M. aeruginosa</i>. Temporal variations in <i>M. aeruginosa</i> concentration and key water quality indicators pH, DO, COD, TP, TN, NH<sub>4</sub><sup>+</sup>-N, and NO<sub>3</sub><sup>−</sup>-N, were monitored. Results demonstrated that introduction of these aquatic animals at different densities achieved <i>M. aeruginosa</i> removal efficiencies exceeding 78%. Notably, a high-density treatment of <i>P. caudatum</i> (160 ind/L) resulted in a maximum removal efficiency of 92.58%. Moreover, polyculture systems—particularly the combination of <i>P. caudatum</i> and <i>M. nipponense</i>—exhibited high removal efficiencies (&gt; 90%), comparable to those obtained with the most effective single-species treatment. These findings indicate that well-designed multi-trophic biomanipulation strategies can achieve algal removal performance comparable to high-density single-species applications, offering a potentially robust and sustainable approach for controlling <i>M. aeruginosa</i> blooms in freshwater systems.</p>

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Effect of aquatic animal combination and their density on the removal of Microcystis aeruginosa from wastewater

  • 期刊论文

  • 发表日期：

    2026年2月12日

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  • Jiaming Zheng,
  • Shanshan Xie,
  • Xiangyong Zheng,
  • Wenjuan Han,
  • Min Zhao

摘要

Microcystis aeruginosa, a common cyanobacterium in freshwater ecosystems, releases harmful microcystin and algal organic matter, posing serious risks to aquatic ecosystems and water quality. This study aimed to identify effective biological approaches for the removal of M. aeruginosa and to optimize the operational control conditions. Five aquatic animals: Paramecium caudatum, Daphnia magna, Macrobranchium nipponense, Bellamya aeruginosa, Unio douglasiae were selected to investigate their individual and combined effect on the removal of M. aeruginosa. Temporal variations in M. aeruginosa concentration and key water quality indicators pH, DO, COD, TP, TN, NH4+-N, and NO3−-N, were monitored. Results demonstrated that introduction of these aquatic animals at different densities achieved M. aeruginosa removal efficiencies exceeding 78%. Notably, a high-density treatment of P. caudatum (160 ind/L) resulted in a maximum removal efficiency of 92.58%. Moreover, polyculture systems—particularly the combination of P. caudatum and M. nipponense—exhibited high removal efficiencies (> 90%), comparable to those obtained with the most effective single-species treatment. These findings indicate that well-designed multi-trophic biomanipulation strategies can achieve algal removal performance comparable to high-density single-species applications, offering a potentially robust and sustainable approach for controlling M. aeruginosa blooms in freshwater systems.