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a, Cumulative methane from waste activated sludge (WAS) pretreated by varying periodate (PI) levels during anaerobic digestion. The dotted line represents the results of model simulated. b, The relationship between the maximum cumulative methane yield and PI levels. c, The confidence regions of 95% about the hydrolysis rate (k) and biochemical methane potential (B0) based on the model simulation. Error bars represented standard deviation of triplicate tests.
