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<p>Petroleum refinery wastewater (PRWW) with 4% salinity was subjected to treatment and simultaneous generation of energy in air cathode-microbial fuel cell (MFC). Substrate load (SL) such as 0.41 gCOD/L, 0.84 gCOD/L, 1.26 gCOD/L, 1.78 gCOD/L and 2.25 gCOD/L was trialed in air cathode MFC. COD (chemical oxygen demand) reduction was 88% (total COD) and 87% (soluble COD) at optimized SL of 1.78 gCOD/L. Corresponding power and current density derived at optimized SL of 1.78 gCOD/L was 879 mW/m<sup>2</sup> and 1052&#xa0;mA/m<sup>2</sup> respectively. Degradation of low and high molecular weight petroleum hydrocarbons in the PRWW was greater than 90% to&#xa0;100% &#xa0;and 71%&#xa0;to 82% respectively. Supplementation with a mild nutritional substrate in PRWW accelerated the hydrocarbon biodegradation with time reduction in MFC operated at 1.78 gCOD/L SL. Phylogenetic analysis revealed the dominancy of exo-electrogenic halophilic strains such as <i>Ochrobactrum</i>, <i>Marinobacter</i>, <i>Bacillus</i> and <i>Stenotrophomonas</i> in the reactor. Thus the bioaugmentation of halophiles in MFC efficiently treated PRWW and harvested bioenergy under saline condition.</p>

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Saline petroleum refinery wastewater treatment integrated with bioelectricity production using halophiles in microbial fuel cell (MFC)

  • 期刊论文

  • 发表日期：

    2025年12月2日

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  • Arulazhagan Pugazhendi

摘要

Petroleum refinery wastewater (PRWW) with 4% salinity was subjected to treatment and simultaneous generation of energy in air cathode-microbial fuel cell (MFC). Substrate load (SL) such as 0.41 gCOD/L, 0.84 gCOD/L, 1.26 gCOD/L, 1.78 gCOD/L and 2.25 gCOD/L was trialed in air cathode MFC. COD (chemical oxygen demand) reduction was 88% (total COD) and 87% (soluble COD) at optimized SL of 1.78 gCOD/L. Corresponding power and current density derived at optimized SL of 1.78 gCOD/L was 879 mW/m2 and 1052 mA/m2 respectively. Degradation of low and high molecular weight petroleum hydrocarbons in the PRWW was greater than 90% to 100%  and 71% to 82% respectively. Supplementation with a mild nutritional substrate in PRWW accelerated the hydrocarbon biodegradation with time reduction in MFC operated at 1.78 gCOD/L SL. Phylogenetic analysis revealed the dominancy of exo-electrogenic halophilic strains such as Ochrobactrum, Marinobacter, Bacillus and Stenotrophomonas in the reactor. Thus the bioaugmentation of halophiles in MFC efficiently treated PRWW and harvested bioenergy under saline condition.