| .固含率对酒糟与餐厨垃圾混合厌氧发酵产沼气的影响[J].农业环境科学学报,2013,32(5):. |
| 固含率对酒糟与餐厨垃圾混合厌氧发酵产沼气的影响 |
| Influence of Total Solid Contents on Anaerobic Co-digestion from Distiller′s Grains and Food Waste for Methane Production |
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| DOI：10.11654/jaes.2013.05.028 |
| 中文关键词: 固含率 酒糟 餐厨垃圾 甲烷 厌氧混合干式发酵 |
| 英文关键词: total solid content distiller′s grains food waste methane anaerobic solid-state co-digestion |
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| 中文摘要: |
| 采用酒糟与餐厨垃圾作为发酵底物，并接种消化污泥进行厌氧干式发酵试验，比较固含率为15%、20%、25%、30%条件下甲烷产率、有机物去除率，并结合各项参数综合分析干式厌氧发酵过程。结果表明，由于营养物质较多，在一定范围内提高固含率有助于提高总甲烷产率，但较高的固含率会影响微生物代谢活性，降低反应速率，延长发酵周期，发酵50 d后，各试验组中，固含率为25%时产气效果最佳，其总产气率达238.48 mL·g-1 TS，且TS、VS减量化程度达到最大，分别为55.65%、72.15%，继续增大固含率甲烷产率反而降低。干式厌氧发酵过程主要问题是由于发酵初期快速水解酸化引起的酸抑制作用，且固含率越高，抑制现象越明显。试验中累计甲烷产率基本符合一级反应动力学模型，其R2值均高于0.94，但随着固含率增加，体系产甲烷潜能逐步提升，反应速率逐步减慢，试验数据对模型的符合程度逐步降低。 |
| 英文摘要: |
| The method of anaerobic solid-state digestion was used to examine the effects of different total solid contents on methane yield and organic removal rate from distiller′s grains and food waste at total solid content of 15%, 20%, 25% and 30% with activated sludge as inocula. Combined with various procedure parameters such as VFA, alkalinity and pH value, solid-state fermentation process was also analysed. The results showed that due to the high nutrient content, increasing total solid content within a certain extent could boost the production of methane, but decrease reaction speed and prolong fermentation period because of low metabolites from microbiology. After 50-days of fermentation, the highest accumulated methane yield of all the groups was 238.48 mL·g-1 TS at total solid content of 25% with optimal TS removal of 55.65% and VS removal of 72.15%. Keeping increasing total solid content lead to less methane yield. The irreversible acidification of the digestion resulting from the rapid hydrolysis and acidogenesis was the major challenge in solid-state anaerobic digestion considering that it could inhibit methanogenesis or dictate the failure of the digestion. And the higher total solid content could cause more obvious inhabitation. In addition, the cumulative methane production rate basically fitted the first order kinetic model, and R2 of all the groups were higher than 0.94. As the total solid contents increased, methane producing potential enhanced, the kinetic constants slowed down and the degree of compliance with the model lowered gradually. |
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