| 摘要: |
| 【目的】研究不同配比猪粪与小麦秸秆混合厌氧发酵的产气特性，为提高小麦秸秆利用率和产气效率提供依据。【方法】选取猪粪、小麦秸秆及其不同配比（干物质质量比1∶1，2∶1，3∶1）的混合物为发酵原料，以沼液为接种物，研究不同发酵原料厌氧发酵过程中pH值、日产气量、累积产气量、气体成分和干物质产气率的变化。【结果】仅以猪粪为原料进行厌氧发酵时，日产气量的峰值（2 142.2 mL/d）、累积产气量（70.36 L）和干物质产气率（351.8 mL/g）明显高于其他4种发酵原料；在3种混合发酵原料中，猪粪与小麦秸秆配比为3∶1时，其日产气量的峰值（2 011.7 mL/d）、累积产气量（49.08 L）和干物质产气率（245.4 mL/g）明显高于其他2种混合发酵原料。随着厌氧发酵时间的延长，猪粪与小麦秸秆及其按不同比例配比时，所产气体中的甲烷体积分数呈逐渐增加趋势，在厌氧发酵中后期甲烷体积分数达到45%以上；所产气体中硫化氢的体积分数呈逐渐下降趋势，其中猪粪所产气体中硫化氢的体积分数较其他处理高。【结论】在厌氧发酵过程中，合理调控猪粪与小麦秸秆的配比，既能提高小麦秸秆的产气量，又能缩短猪粪的产气周期，降低硫化氢体积分数。 |
| 关键词: 沼气 混合发酵 猪粪 小麦秸秆 产气效率 |
| DOI： |
| 分类号: |
| 基金项目:国家“十一五”科技支撑计划项目（2007BAD89B16）；陕西省“13115”重大科技计划项目（2009ZDKG-03）；陕西省“13115”科技创新工程重大科技专项（2010ZDKG-06）；国家自然科学基金项目（30700482） |
|
| Characteristics of anaerobic digestion of pig dung，wheat straw combination in various ratios |
|
|
| Abstract: |
| 【Objective】 The research was to study the biogas production efficiency of pig dung and wheat straw in various ratios to increase the biogas production efficiency of wheat straw.【Method】 The experiment was carried out in controllable constant temperature fermented equipment,pig dung,wheat straw with a ratio of 1∶1,2∶1,3∶1 (total solid ratio) were used as fermentation materials,and the fermented slurry was used as inoculum.The pH,daily biogas production,cumulative biogas yield,biogas composition and the biogas production rate of total solid of 5 materials during anaerobic digestion were tested.【Result】 When pig dung was used as fermentation material,the maximal daily biogas production was 2 142.2 mL/d,cumulative biogas yield 70.36 L and the biogas production of total solid 351.8 mL/g,which was significantly better than the other four fermented materials.Among the 3 mixed materials,3∶1 was the best,maximal daily biogas production being 2 011.7 mL/d,cumulative gas production 49.08 L and the gas production of dry matter 245.4 mL/g.As the digestion time increased,the methane volume fraction produced by pig dung,wheat straw and the different mixed materials increased,in late anaerobic digestion the methane volume fraction was above 45%.The H2S volume fraction decreased,the H2S volume fraction produced by pig dung was higher than other materials.【Conclusion】 During anaerobic digestion,reasonable ratio of pig manure and wheat straw is used as fermentation materials.Both can increase the biogas production efficiency of wheat straw,shorten the anaerobic digestion cycle and decrease the H2S volume fraction of pig dung. |
| Key words: biogas co-digestion pig dung wheat straw biogas production efficiency |
