Abstract
The effects of selenite addition on process performance and microbial communities during the mesophilic anaerobic digestion of pig manure were investigated. At low selenium concentration (0.1 mg/L), methane yield and methane production rate increased by 121% and 113%, respectively. High selenium concentration (30–120 mg/L) decreased methane yield by 23.1–100% and methane production rate by 1.3–100% owing to the reduced hydrolytic enzyme and F420 activities at initial phase of anaerobic digestion. Meanwhile, the inhibited activity of methane production could be completely recovered through a successive supplementing organic matter for selenite reduction. Besides, selenite addition also altered the relative abundance of hydrolytic and acetogenic bacteria, and increased the relative abundance of acetoclastic methanogen. These results suggested that the inhibited methane production was owing to the fact that the selenite-reducing microorganism competes with methane-producing microorganism for H2 and acetate, but selenite might not directly inhibit methane-producing microorganism.
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