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Multi-anode enhanced the bioelectricity generation in air-cathode microbial fuel cells towards energy self-sustaining wastewater treatment.
Xie, Li; Tanaka, Fumichika; Yagi, Toshiyuki; Hashimoto, Hideaki; Ikeru, Kyo; Igarashi, Takashi; Kobayashi, Hiroaki; Sakoda, Mitsuhiro; Yoshida, Naoko.
Afiliação
  • Xie L; Department of Civil Engineering, Nagoya Institute of Technology (Nitech), Nagoya, Japan.
  • Tanaka F; Department of Civil Engineering, Nagoya Institute of Technology (Nitech), Nagoya, Japan.
  • Yagi T; Department of Civil Engineering, Nagoya Institute of Technology (Nitech), Nagoya, Japan.
  • Hashimoto H; Department of Civil Engineering, Nagoya Institute of Technology (Nitech), Nagoya, Japan.
  • Ikeru K; Department of Civil Engineering, Nagoya Institute of Technology (Nitech), Nagoya, Japan.
  • Igarashi T; Research Center, TOYOBO Co., LTD., 2-1-1, Katata, Otsu, Shiga, Japan.
  • Kobayashi H; River & Water Resources Division, NIPPON KOEI Co., Ltd., 5-4 Kojimachi, Chiyoda-ku, Tokyo, Japan.
  • Sakoda M; Water & Sewage Department, Tamano Consultants Co., Ltd., 2-17-14, Higashisakura, Higashi-ku, Nagoya, Aichi, Japan.
  • Yoshida N; Department of Civil Engineering, Nagoya Institute of Technology (Nitech), Nagoya, Japan. Electronic address: yoshida.naoko@nitech.ac.jp.
Environ Res ; 243: 117744, 2024 Feb 15.
Article em En | MEDLINE | ID: mdl-38092240
Microbial fuel cells (MFCs) hold considerable promise for harnessing the substantial energy resources present in wastewater. However, their practical application in wastewater treatment is limited by inadequate removal of organic matter and inefficient power recovery. Previous studies have investigated aeration as a method to enhance the removal of organic matter, but this method is energy-intensive. To address this issue, this study proposed using MFC-recovered bioelectricity for aeration, thereby mitigating the associated expenses. An air-cathode MFC with multi-anode was constructed and optimized to maximize electricity supply for aeration. Carbon-felt anodes were chosen as the most effective anode configuration, due to the high abundance of electroactive bacteria and genes observed in the biofilm generated on their surface. By incorporating six carbon felt anodes, the MFC achieved a 1.7 and 1.1 fold enhancement in the maximum power and current density, respectively. The optimized MFC unit achieved a stable current density of 0.32 A/m2 and achieved COD removal of 60% in the long-term operation of 140 days in a 50 L reactor. In a reactor scaled up to 1600 L, 72 MFCs successfully powered a mini air pump work for 10 s after an 81-s charging period. The intermittent aeration resulted in partial increases in DO concentrations to 0.03-3.5 mg/L, which is expected to promote the removal of nitrogen compounds by the nitrification-anammox process. These groundbreaking results lay the foundation for self-sustaining wastewater treatment technologies.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Fontes de Energia Bioelétrica / Purificação da Água Idioma: En Revista: Environ Res Ano de publicação: 2024 Tipo de documento: Article País de afiliação: Japão

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Fontes de Energia Bioelétrica / Purificação da Água Idioma: En Revista: Environ Res Ano de publicação: 2024 Tipo de documento: Article País de afiliação: Japão