Scholarlink

<p>The artificial recycling of CO<sub>2</sub> into value-added feedstocks and chemicals provides a sustainable approach to mitigate its greenhouse effect and realize a carbon-neutral economy, for which the direct and efficient utilization of CO<sub>2</sub> reduction products without additional separation and purification remains challenging. Here an electrochemical–biological hybrid system has been developed to merge CO<sub>2</sub> electrolysis with municipal wastewater treatment. In this set-up, the formate produced electrocatalytically (formate-e) in neutral electrolyte (1.0 M KHCO<sub>3</sub>) is directly applied as a carbon source and energy carrier for biological denitrification using activated sludge from municipal wastewater treatment plants, exhibiting an excellent nitrate nitrogen (NO<sub>3</sub><sup>−</sup>-N) removal rate of ~3.06 mg l<sup>−1</sup> h<sup>−1</sup>. Moreover, after long-term continuous operation of the tailored denitrification bioreactor, the formate-e displayed high denitrification rate of 1.08 mgNO<sub>3</sub><sup>−</sup>-N per gram suspended solids per litre per hour, surpassing that of acetate, widely used as a commercial carbon source. Further environmental and techno-economic analyses suggest that integrating this electrochemical–biological hybrid system with an electrochemical recovery and separation system can significantly lower the cost of the electrolyte, thereby showing promise for the direct use of formate-e in industrial applications for wastewater treatment.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Realizing the practical application of CO2 electroreduction for urban wastewater denitrification

  • 期刊论文

  • 发表日期：

    2025年9月29日

查看全文
  • Qiqi Wu,
  • Sijia Ji,
  • Jinling Chen,
  • Xin-Quan Tan,
  • Wee-Jun Ong,
  • Ruian Du,
  • Peng Wang,
  • Haonan Wang,
  • Yongcai Qiu,
  • Keyou Yan,
  • Yun Zhao,
  • Wei-Wei Zhao,
  • Kang-Shun Peng,
  • Yi-Yu Chen,
  • Sung-Fu Hung,
  • Linan Zhou,
  • Xue Wang,
  • Guanglei Qiu,
  • Guangxu Chen

摘要

The artificial recycling of CO2 into value-added feedstocks and chemicals provides a sustainable approach to mitigate its greenhouse effect and realize a carbon-neutral economy, for which the direct and efficient utilization of CO2 reduction products without additional separation and purification remains challenging. Here an electrochemical–biological hybrid system has been developed to merge CO2 electrolysis with municipal wastewater treatment. In this set-up, the formate produced electrocatalytically (formate-e) in neutral electrolyte (1.0 M KHCO3) is directly applied as a carbon source and energy carrier for biological denitrification using activated sludge from municipal wastewater treatment plants, exhibiting an excellent nitrate nitrogen (NO3−-N) removal rate of ~3.06 mg l−1 h−1. Moreover, after long-term continuous operation of the tailored denitrification bioreactor, the formate-e displayed high denitrification rate of 1.08 mgNO3−-N per gram suspended solids per litre per hour, surpassing that of acetate, widely used as a commercial carbon source. Further environmental and techno-economic analyses suggest that integrating this electrochemical–biological hybrid system with an electrochemical recovery and separation system can significantly lower the cost of the electrolyte, thereby showing promise for the direct use of formate-e in industrial applications for wastewater treatment.