Hydrogen Production by Anaerobic Fermentation From Wastewater in Poultry Farms

Methods of sludge pretreatment and substrate mass concentration influencing fermentation of poultry dung wastewater are investigated in this research.The anaerobic conditions are as follows: temperature is 36 ℃,pH is 5.0,and rice bran fluid is added to increase w(C)/w(N) of wastewater.Meanwhile,terminal product of liquid phase and removal rate of COD of fermentation liquor are also analyzed.Results show that the best method of sludge pretreatment is heat treatment(at 100 ℃ for 15 minutes);the production of cumulative biogas and hydrogen are 1 781 mL and 1 082.8 mL,2.52 and 5.85 times untreated group,respectively.The optimum mass concentration of poultry dung wastewater is 10 218 mg/L with hydrogen yield as 185.1 mL/g.At the end of fermentation,the products of liquid phase are organic acids such as acetic acid and butyric acid.The removal of COD varies with substrate concentration,which reaches 26.9% at the mass concentration of 10 218 mg/L.