秸秆发酵产氢的碱性预处理方法研究

以麦秆、稻草和滤纸为发酵底料,以厌氧活性污泥为接种物,采用不同的预处理方法去除木质素并提高纤维素的降解率,从而提高其发酵产氢能力。试验表明对于相同的底料,经过NaOH预处理和纤维素酶解后的还原糖含量、总产气量、总产氢量和氢气浓度都要高于经过氨水预处理的底料,而未经过预处理的底料发酵产氢能力最差。利用10g经过NaOH预处理的麦秆和稻草,经纤维素酶解后在发酵产氢过程中的降解率分别为23.2%和12.5%,总产氢量分别为363.3mL和254.9mL,发酵产气中氢气浓度分别为23.8%和29.1%。发酵液相中主要产物为乙醇、乙酸和丁酸。

IMPACT OF ALKALINE PRETREATMENT ON BIO-HYDROGEN PRODUCTION FROM STRAW BY ANAEROBIC FERMENTATION

Sodium hydroxide(NaOH) and ammonia(NH3) solutions were used in chemical pretreatment of wheat straw,rice straw and filter paper for improveing the degradation rates and bio-hydrogen productions in the fermentations.The experiments shown that the reducing sugar content,bio-gas production,bio-hydrogen production and bio-hydrogen concentration obtained from the substrates with NaOH pretreatment are all higher than those obtained from the same substrates with NH pretreatment,and the substrate without pretreatment has the lowest bio-hydrogen production capability.For wheat straw and rice straw(10g) with NaOH pretreatment,their degradation rates,bio-hydrogen productions and bio-hydrogen concentrations in the fermentations are respectively 23.2% and 12.5%,363.3ml and 254.9ml,23.8% and 29.1%.The produced volatile fatty acids in the fermentation solutions are mainly ethanol,acetate and butyrate.