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Relative abundance of Lactobacillaceae (○), Veillonellaceae (●), Prevotellaceae (⋄), and Clostridiaceae (▲) in relation to acetic (
), lactic (
), and propionic (
) acid concentrations detected in mixed raw effluent (MRE), the mixing pond, holding tank, and closed reactor. No acids were detected in the open digester or the subsequent stages of the palm oil mill effluent (POME) treatment. Error bars represent standard deviations in experiments performed in triplicate.
