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To enhance anaerobic fermentation biogas production, excess sludge from Hanxi waste water plant of Wuhan City was first pretreated by peracetic acid (PAA), then anaerobic digested for 20 days in 35degC. An anaerobic digestion process without pretreatment was conducted as reference for comparison purpose. The results showed that organic matter dissolved from sludge after PAA pretreatment, soluble chemical...
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