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

Wen Huang; Jie Zhou; Qian Hu; Bin Qiu; Mina Huang; Vignesh Murugadoss; Zhanhu Guo

doi:10.1016/j.chemosphere.2022.133953

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

Chemosphere. 2022 Jun:296:133953. doi: 10.1016/j.chemosphere.2022.133953. Epub 2022 Feb 11.

Authors

Wen Huang¹, Jie Zhou¹, Qian Hu¹, Bin Qiu², Mina Huang³, Vignesh Murugadoss⁴, Zhanhu Guo⁵

Affiliations

¹ Beijing Key Laboratory for Source Control Technology of Water Pollution, College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, China.
² Beijing Key Laboratory for Source Control Technology of Water Pollution, College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, China. Electronic address: qiubin2015@bjfu.edu.cn.
³ Integrated Composites Laboratory (ICL), Department of Chemical and Biomolecular Engineering, University of Tennessee, 1512 Middle Dr, Knoxville, TN, 37996, USA.
⁴ Advanced Materials Division, Engineered Multifunctional Composites (EMC) Nanotech LLC, Knoxville, TN, 37934, USA.
⁵ Integrated Composites Laboratory (ICL), Department of Chemical and Biomolecular Engineering, University of Tennessee, 1512 Middle Dr, Knoxville, TN, 37996, USA. Electronic address: zguo10@utk.edu.

PMID: 35157884
DOI: 10.1016/j.chemosphere.2022.133953

Abstract

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.

Keywords: Anaerobic sludge; Conductive materials; Methane production; Species annotation.

MeSH terms

Anaerobiosis
Aniline Compounds
Archaea / metabolism
Bacteria / metabolism
Bioreactors
Ferrosoferric Oxide*
Methane / metabolism
Water Purification*

Substances

Aniline Compounds
polyaniline
Methane
Ferrosoferric Oxide