Analysis on Influencing Factors of Hydrogen and Acid Production from Anaerobic Fermentation of Sludge

An anaerobic sludge fermentation reactor was designed to conduct a small-scale test for production of acetic acid from sludge.The results of 6-month experiment indicated that pH and substrate concentration had significant effect on acid and hydrogen production from anaerobic fermentation of sludge.Under normal temperature conditions,the hydrogen production rate was 6.88 mL /gVS at pH of6.5,and the accumulative hydrogen production was 1 122 mL when the mass fraction of the substrate was10%,and the fermentation time was 120 h.At the same time,the anaerobic fermentation system also had optimum acid production characteristic.The content of VFA was only 465 mg /L when the substrate was uninoculated,and the fermentation time was 120 h,but the content of VFA was 1 125 mg /L when the mass fraction of the substrate was 10%.