酸碱预处理对稻草秸秆发酵产氢的影响

随着环保要求的日益严格和化石能源的日益短缺,氢能作为清洁高效的可再生能源受到人们的普遍重视。厌氧发酵生物制氢是利用生物技术分解有机废弃物制备氢气,该工艺设备简单、操作容易、成本低廉等优点。以稻草秸秆为发酵底料,以厌氧活性污泥为接种物,研究酸碱预处理对秸秆发酵产氢的影响。结果表明,H2SO4预处理为最佳的预处理方式;稻草秸秆经1%的H2SO4预处理后发酵气中氢气的最大含量、最高比产氢速率和最高氢气产率分别为47.68%、4.67mL/(h.g)和59.21 mL/g;经1%的NaOH预处理后发酵气中氢气的最大含量、最高比产氢速率和最高氢气产率分别为41.92%、3.24 mL/(h.g)和42.02 mL/g;发酵液相中主要产物为乙醇、乙酸和丁酸。

Effect of acid and alkaline pretreatment on bio-hydrogen production from rice straw by anaerobic fermentation

Hydrogen,as a clean energy that can replace conventional fossil fuels,is attracting worldwide attentions.Bio-hydrogen production process with anaerobic fermentation resolves the organic waste by the biological technology to produce hydrogen with simple equipments,easy manipulation and low cost.Effects of acid and alkaline pretreatment on bio-hydrogen production from rice straw by anaerobic sludge fermentation were studied.The results show that H2SO4 pretreatment is the best one.Rice straw with 1% H2SO4 pretreatment,the maximum hydrogen concentration,the highest specific hydrogen production yield rate and the highest hydrogen production yield were respectively 47.68%、4.67 mL/(h·g) and 59.21 mL/g.With 1% NaOH pretreatment,the maximum hydrogen concentration,the highest specific hydrogen production yield rate and the highest hydrogen production yield were respectively 41.92%、3.24 mL/(h·g) and 42.02 mL/g.The produced volatile fatty acids in the fermentation solutions are mainly ethanol,acetate and butyrate.