Borole Abhijeet P, Klasson K Thomas, Ridenour Whitney, Holland Justin, Karim Khursheed, Al-Dahhan Muthanna H
Oak Ridge National Laboratory, Oak Ridge, TN 37831-6226, USA.
Appl Biochem Biotechnol. 2006 Spring;129-132:887-96.
Manure waste from dairy farms has been used for methane production for decades, however, problems such as digester failure are routine. The problem has been investigated in small scale (1-2 L) digesters in the laboratory; however, very little scale-up to intermediate scales are available. We report production of methane in a 100-L digester and the results of an investigation into the effect of partial mixing induced by gas upflow/recirculation in the digester. The digester was operated for a period of about 70 d (with 16-d hydraulic retention time) with and without the mixing induced by gas recirculation through an internal draft tube. The results show a clear effect of mixing on digester operation. Without any mixing, the digester performance deteriorated within 30-50 d, whereas with mixing continuous production of methane was observed. This study demonstrates the importance of mixing and its critical role in design of large scale anaerobic digesters.
几十年来，奶牛场的粪便废弃物一直被用于生产甲烷，然而，诸如沼气池故障等问题却很常见。该问题已在实验室的小规模（1-2升）沼气池进行了研究；然而，很少有扩大到中等规模的研究。我们报告了在一个100升沼气池中产甲烷的情况，以及对沼气池内气体上流/再循环引起的部分混合效果的调查结果。该沼气池在有和没有通过内部导流管进行气体再循环引起的混合的情况下，运行了约70天（水力停留时间为16天）。结果表明混合对沼气池运行有明显影响。没有任何混合时，沼气池性能在30-50天内恶化，而有混合时则观察到甲烷的持续产生。这项研究证明了混合的重要性及其在大型厌氧沼气池设计中的关键作用。
