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<p>The recent development in mariculture production has led to the global need to find an eco-friendly treatment that could mitigate the detrimental effects of nitrogenous compounds on aquatic species, the environment, and public health. The potential application of corn straw biochar (BC) combined with nano-ferrous oxalate (FeC<sub>2</sub>O<sub>4</sub>), integrated into a sponge (BC/FeC<sub>2</sub>O<sub>4</sub>/SB) as a cost-effective and sustainable novel carrier for the removal of nitrogenous compounds, was explored in this study. The modified carriers were filled into a moving bed bioreactor (MBBR) to treat simulated saline aquaculture wastewater for the first time. Scanning electron microscope (SEM) and Fourier-transform infrared (FTIR) spectroscopy analyses characterized the carrier biofilm morphology and functional group compositions. Findings showed that the modified carrier achieved the highest reduction percentages of 99.49 ± 0.29% for ammonium and 81.3 ± 2.1% for nitrate, with lower nitrite accumulation by day 136. The microbial sequencing analysis revealed that the coexistence of nitrogen removal and salt-tolerant microbes from the genera <i>Aquimonas</i> (25.15%), <i>Woodsholea</i> (20.44%), <i>Hydrogenophaga</i> (14.73%), <i>Nitrosomonas</i> (4.01%), <i>Rhodococcus</i> (2.70%), and <i>Nitrospira</i> (1.97%) resulted in the enhanced treatment performance observed in the modified BC/FeC<sub>2</sub>O<sub>4</sub>/SB carrier-filled MBBR as compared to the control MBBR. The data obtained in this study provide a comprehensive understanding of the role of modified BC/FeC<sub>2</sub>O<sub>4</sub>/SB carriers for the efficient treatment of saline RAS wastewater using MBBR.</p>

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Performance and microbial community structure of BC/FeC2O4/SB modified carriers on the nitrogen removal from mariculture wastewater

  • 期刊论文

  • 发表日期：

    2025年7月19日

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  • A. Shitu,
  • M. A. Tadda,
  • H. Li,
  • U. A. Danhassan,
  • M. Gouda,
  • J. Zhou,
  • D. Liu,
  • W. Chen,
  • S. Zhu

摘要

The recent development in mariculture production has led to the global need to find an eco-friendly treatment that could mitigate the detrimental effects of nitrogenous compounds on aquatic species, the environment, and public health. The potential application of corn straw biochar (BC) combined with nano-ferrous oxalate (FeC2O4), integrated into a sponge (BC/FeC2O4/SB) as a cost-effective and sustainable novel carrier for the removal of nitrogenous compounds, was explored in this study. The modified carriers were filled into a moving bed bioreactor (MBBR) to treat simulated saline aquaculture wastewater for the first time. Scanning electron microscope (SEM) and Fourier-transform infrared (FTIR) spectroscopy analyses characterized the carrier biofilm morphology and functional group compositions. Findings showed that the modified carrier achieved the highest reduction percentages of 99.49 ± 0.29% for ammonium and 81.3 ± 2.1% for nitrate, with lower nitrite accumulation by day 136. The microbial sequencing analysis revealed that the coexistence of nitrogen removal and salt-tolerant microbes from the genera Aquimonas (25.15%), Woodsholea (20.44%), Hydrogenophaga (14.73%), Nitrosomonas (4.01%), Rhodococcus (2.70%), and Nitrospira (1.97%) resulted in the enhanced treatment performance observed in the modified BC/FeC2O4/SB carrier-filled MBBR as compared to the control MBBR. The data obtained in this study provide a comprehensive understanding of the role of modified BC/FeC2O4/SB carriers for the efficient treatment of saline RAS wastewater using MBBR.