Improved methanogenesis in anaerobic wastewater treatment by magnetite@polyaniline (Fe3O4@PANI) composites

• Published in: Chemosphere (Oxford) Vol. 296; p. 133953
• Main Authors: Huang, Wen, Zhou, Jie, Hu, Qian, Qiu, Bin, Huang, Mina, Murugadoss, Vignesh, Guo, Zhanhu
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01.06.2022
• Subjects: Anaerobic sludge; Anaerobiosis; Aniline Compounds; Archaea - metabolism; Bacteria - metabolism; Bioreactors; Conductive materials; Ferrosoferric Oxide; Methane - metabolism; Methane production; Species annotation; Water Purification; Anaerobic sludge; Species annotation; Conductive materials; Methane production
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2022.133953

The magnetite@polyaniline (Fe3O4@PANI) composites with different Fe3O4 loadings were prepared, and their effect on methane production in anaerobic systems was investigated. The Fe3O4@PANI composite with a 40% loading of Fe3O4 showed a better performance on accelerating methane production rate than other composites. The methane production rate was increased by 26.98% at the Fe3O4@PANI dosage of 0.6 g L−1. The results of the contact angle and CLSM revealed that Fe3O4@PANI had a good bio-affinity and contact directly with bacteria and archaea. Then the mechanisms related to the enhancement of methane production by the composites were explored by the species annotation and enzyme activity. It showed that Fe3O4@PANI promoted the enrichment of DIET-related functional bacteria and archaea and improved the enzyme activity related to the acetoclastic methanogenic pathway. [Display omitted] •Methane production rate could be increased by Fe3O4@PANI by 26.98%.•Fe3O4@PANI promoted the enrichment of DIET-related microorganisms.•Fe3O4@PANI improved enzyme activity related to aceticlastic methanogenesis.