Effects of Mixing Ratio on Hydrogen Production from Anaerobic Co-fermentation of Cattle Manure and Food Waste

Abstract:

Evaluation of anaerobic co-fermentation of cattle manure (CM) and food waste (FW) was conducted in bath test at 35℃. Effects of mixing ratio on hydrogen yield, pH value, composition of dissolved fermentation products, and VS degradation rate were investigated. Results showed that a mixing ratio of 40∶40 would significantly enhance the efficiency of hydrogen production, and the maximums of hydrogen yield and VS degradation rate (17mL/g and 27.9%, respectively) were obtained. It is found that mixing ratios lead to different fermentation type. Mixing ratio of 40∶40 achieved pH value of 5.5 and butyric acid type fermentation. At multi-FW case, phenomenon of no hydrogen production, ethanol as dominant dissolved fermentation products and pH value below 4.0 was observed. As far as case of multi-CM, low hydrogen production rate was achieved as well as acetic acid as dominant dissolved fermentation products and pH value above 6.0.