城市生活垃圾有机组分厌氧发酵产氢和甲烷

为了提高能源回收效率,采用大米、土豆、生菜、瘦肉、花生油和榕树叶作为实验原料,模拟有机垃圾中普遍存在的淀粉、膳食纤维、蛋白质、脂肪和木质纤维类成分,进行厌氧发酵产氢以及对其剩余物厌氧发酵产甲烷.结果表明.在厌氧发酵产氢阶段,整个过程没有甲烷生成,大米、土豆、生菜、瘦肉、花生油和榕树叶的氢气产率分别为125、103、35、0、5和0 mL g-1(VS),能源回收效率分别为7.9%、6.8%、1.9%、0、0.1%和0.大米、土豆和生菜的氢气浓度分别为34%～59%、41%～56%和37%～70%,整个产氢阶段没有甲烷生成.在厌氧发酵产甲烷阶段,上述原料的甲烷产率分别为232、237、148、278、866和50 mL g-1(VS),生物气中甲烷含量分别为42%～70%、57%～71%、73%～77%、59%～73%、68%～80%和54%～74%.厌氧发酵联产氢气和甲烷整个过程上述原料的能源回收效率分别为56.3%、58.4%、28.8%、39.2%、81.2%和8.8%,总COD去除率分别为72.30%、81.70%、32.63%、47.59%、97.46%和11.29%.图4表5参35

Sequential Anaerobic Fermentative Production of Hydrogen and Methane from Organic Fraction of Municipal Solid Waste

In order to improve energy recovery efficiency, the fermentative hydrogen production from organic fraction of municipal solid waste (OFMSW) was followed by methane production using the residual of hydrogen production as substrate. Six individual components of OFMSW including rice, potato, lettuce, lean meat, peanut oil and banyan leaves were selected as experimental materials. The results showed that at the hydrogen production stage, the hydrogen yields were 125, 103, 35, 0, 5 and 0 mL g-1(VS), and the energy efficiencies were 7.9%, 6.8%, 1.9%, 0, 0.1% and 0 for rice, potato, lettuce, lean meat, peanut oil and banyan leaves, respectively. The hydrogen compositions in biogas were about 34%～59%, 41%～56% and 37%～70% for rice, potato and lettuce, respectively. No methane was produced during the hydrogen production stage. During the methane production stage, the methane yields were 232,237, 148, 278, 866 and 50 mL g-1(VS); the methane contents were 42%～70%, 57%～71%, 73%～77%, 59%～73%, 68%～80% and 54%～74%; the energy efficiencies of co-production of hydrogen and methane were 56.3%, 58.4%, 28.8%, 39.2%, 81.2% and 8.8%, the total COD removal rates for the whole process of hydrogen and methane production were 72.30%, 81.70%, 32.63%, 47.59%, 97.46% and 11.29% for rice, potato, lettuce, lean meat, peanut oil and banyan leaves, respectively. Fig 4, Tab 5, Ref 35