In this three-year project, we consider the effects of
sludge pretreatments on biogas recycling. In the second
year, the pasteurization has the best hydrogen yield
compared with other pretreatments. Sludge after
pasteurization or acid treatment could not produce
methane. The present study revealed that all pretreatmens
could effectively increase hydrogen yield, while the
fermented liquor with K8 addition could produce
methane gas.
