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<p>Bio-denitrification is vital in wastewater treatment plants (WWTPs), yet its integration with naturally abundant thermal energy remains unexplored. Here, we introduce a biohybrid-based pyroelectric bio-denitrification (BHPD) process that harnesses thermoelectric energy from ambient temperature fluctuations. By integrating <i>Thiobacillus denitrificans</i> with tungsten disulfide (WS<sub>2</sub>), we develop a biohybrid system that achieves complete denitrification over three 5-day cycles under 5 °C temperature fluctuations. WS<sub>2</sub> either precipitates on the cellular surface or is internalized by cells, generating pyroelectric charges that serve as reducing equivalents to drive bio-denitrification. In real wastewater, the BHPD process enhances nitrate removal by up to 8.09-fold under natural temperature fluctuations compared to stable-temperature conditions. Life-cycle assessment demonstrates that the BHPD process has significantly lower environmental impacts than the conventional anaerobic-anoxic-oxic process, and cost analysis confirms its economic feasibility. Our findings highlight the potential of the pyroelectric effect in enhancing bio-denitrification, offering valuable insights for a paradigm shift in WWTPs.</p>

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Biohybrid-based pyroelectric bio-denitrification driven by temperature fluctuations

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月1日

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  • Jie Ye,
  • Shuhui Wang,
  • Chaohui Yang,
  • Zhenhao Zuo,
  • Wenzhi Gu,
  • Baogang Zhang,
  • Shungui Zhou

摘要

Bio-denitrification is vital in wastewater treatment plants (WWTPs), yet its integration with naturally abundant thermal energy remains unexplored. Here, we introduce a biohybrid-based pyroelectric bio-denitrification (BHPD) process that harnesses thermoelectric energy from ambient temperature fluctuations. By integrating Thiobacillus denitrificans with tungsten disulfide (WS2), we develop a biohybrid system that achieves complete denitrification over three 5-day cycles under 5 °C temperature fluctuations. WS2 either precipitates on the cellular surface or is internalized by cells, generating pyroelectric charges that serve as reducing equivalents to drive bio-denitrification. In real wastewater, the BHPD process enhances nitrate removal by up to 8.09-fold under natural temperature fluctuations compared to stable-temperature conditions. Life-cycle assessment demonstrates that the BHPD process has significantly lower environmental impacts than the conventional anaerobic-anoxic-oxic process, and cost analysis confirms its economic feasibility. Our findings highlight the potential of the pyroelectric effect in enhancing bio-denitrification, offering valuable insights for a paradigm shift in WWTPs.