Biogas production and metal passivation analysis during anaerobic digestion of pig manure: effects of a magnetic Fe<sub>3</sub>O<sub>4</sub>/FA composite supplement.

RSC Adv · 2019 · PMC9060600 · PMID 35520184

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a decreasing trendno p-value reported

Gradually, the COD values in all experimental treatments showed a decreasing trend with further anaerobic digestion (after the 5th day).

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