Carbon flow, energy metabolic intensity and metagenomic characteristics of a Fe (III)- enhanced anerobic digestion system during treating swine wastewater

Xie, Hongyu and Wang, Yuzheng and Chen, Yuqi and Hu, Yong and Adeleke, Rasheed A and Obi, Linda U. and Wang, Yuanpeng and Cao, Wenzhi and Lin, Jih-Gaw and Zhang, Yanlong (2024) Carbon flow, energy metabolic intensity and metagenomic characteristics of a Fe (III)- enhanced anerobic digestion system during treating swine wastewater. Science of The Total Environment, 935 (20). pp. 1-6.

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Abstract

Deep treatment and bioenergy recovery of swine wastewater (SW) are beneficial for constructing a low-carbon footprint and resource-recycling society. In this study, Fe (III) addition from 0 to 600mg/L significantly increased the methane (CH ) content of the recovered biogas from 61.4±2.0 to 89.3±2.0% during SW treatment in an anaerobic membrane digestion system. The specific methane yields (SMY) also increased significantly from 0.20±0.05 to 0.29±0.02L/g COD. Fe (III) and its bio-transformed products which participated in establishing direct interspecific electron transfer (DIET), upregulated the abundance of e-pili and Nicotinamide adenine dinucleotide (NADH), enriched electroactive bacteria. The increase in cellular adenosine triphosphate (cATP) from 6583 to 14,518ng/gVSS and electron transport system (ETS) from 1468 to 1968mg/(g·h) promoted the intensity of energy flow and electron flow during anaerobic digestion of SW. Moreover, Fe (III) promoted the hydrolysis and acidification of organic matters, and strengthened the acetoacetic methanogenesis pathway. This study established an approach for harvesting high quality bioenergy from SW and revealed the effects and mechanisms from the view of carbon flow, energy metabolic intensity and metagenomics.

Item Type: Article
Subjects: Q Science > Q Science (General)
Divisions: Faculty of Natural Sciences and Environmental Studies
Depositing User: Uchenna Eneogwe
Date Deposited: 07 Sep 2026 13:34
Last Modified: 07 Sep 2026 13:34
URI: http://eprints.gouni.edu.ng/id/eprint/6340

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