Iron redox cycling drives enhanced methanogenesis in magnetic biochar-mediated anaerobic digestion of waste-activated sludge.

Although the relative abundances of Methanothrix did not show a noticeable difference in either R2 or R3, an increasing trend in R3 was evident with the occurrence of secondary mineralization, while R2 showed a decreasing trend.

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Interestingly, the proportion of Fe(III) in the solid phase of R3 exhibited an elevated trend during methanogenesis ( Fig. 2 c).

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Although the relative abundances of Methanothrix did not show a noticeable difference in either R2 or R3, an increasing trend in R3 was evident with the occurrence of secondary mineralization, while R2 showed a decreasing trend.

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