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Fig. 2 | AMB Express

Fig. 2

From: Effect of Aso limonite on anaerobic digestion of waste sewage sludge

Fig. 2

pH effect in the inhibition of methane fermentation by Aso limonite. Since the addition of Aso limonite triggered to be at around pH 4, the following five WSS samples were prepared for the anaerobic digestion for 7 days: a—control WSS (no pH control), b—the pH of WSS was initially adjusted at pH 4 by adding HCl, c—the WSS at pH 4 was further readjusted at pH 7 by adding NaOH, d—Aso limonite was added to WSS, and e—the WSS with Aso limonite was readjusted at pH 7 by adding NaOH. The concentration of Aso limonite used in this experiment was 5% (w/v). Error bars represent the standard errors (n = 3)

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