牛粪与餐厨废弃物混合比例对厌氧发酵产氢的影响

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

为了提高厌氧产氢菌利用复杂原料产氢的能力和稳定性,在35℃条件下,采用批式试验,考察了牛粪与餐厨废弃物混合比例对混合厌氧发酵产氢的挥发性固体产氢率、pH值、液相末端产物组成和挥发性固体去除率等发酵特性的影响。试验结果表明,当牛粪与餐厨废弃物比例接近时,体系pH值维持在5.5左右,丁酸为主要液相末端产物,二者以40∶40混合时,挥发性固体产氢率和挥发性固体去除率均达到最大值,分别为17 mL/g和27.9%;当底物以餐厨废弃物为主时,体系pH值在4.0以下,乙醇为主要液相末端产物,不产氢;当牛粪为主要底物时,体系pH值在6以上,乙酸为主要液相末端产物,产氢率低。

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 of40：40 would significantly enhance the efficiency of hydrogen production, and the maximums of hydrogen yield and VS degradation rate （ 17 mL/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 muhi-CM, low hydrogen production rate was achieved as well as acetic acid as dominant dissolved fermentation products and pH value above 6.0.