Politecnico di Torino, Dipartimento di Ingegneria del Territorio dell'Ambiente e delle Geotecnologie, C.so Duca degli Abruzzi, 24, 10129 Turin, Italy.
Bioresour Technol. 2010 May;101(9):3013-9. doi: 10.1016/j.biortech.2009.12.025. Epub 2010 Jan 6.
The increase of the organic loading rate from 4.45 to 7.78 g-VS/l-d in a one stage, pilot biogas plant was investigated. The experiment was conducted using a co-digestion of cow manure and crop silage mix. The test was divided in three subsequent phases with different feeding ratios. The benefits of optimizing the proportion of crops and loading rate in co-digestion were shown by the fact that during feeding with 70% VS of crop in the feedstock, up to 109% higher specific methane yield was obtained than during the start up phase (only manure). It was also found that further increasing the proportion of crop silage up (to 80%) led to a process breakdown with a decrease of methane proportion down to 48%. On the basis of the present results, it could be possible to obtain an electricity production equal to 15 kwh per 1 t/d. At the end of the monitoring biogas yield was equal to 237 and 249l-CH(4)/kg-VS in the first two phases, and to 61.6l-CH(4)/kg-VS in the third one that led to a process breakdown. The result of this study show, that most agricultural biogas plant have a great potential for a significant capacity increase and technology improvement.
在一个单级、中试沼气厂中，研究了有机负荷率从 4.45 增加到 7.78 g-VS/l-d 的情况。该实验采用牛粪和作物青贮混合物的共消化进行。该试验分为三个不同进料比例的后续阶段。通过优化共消化中作物和进料率的比例，可以显示出优化的好处，即在进料中作物的 VS 占 70%时，比启动阶段（仅粪肥）获得高达 109%的更高的特定甲烷产率。还发现，进一步增加青贮饲料的比例（至 80%）会导致过程崩溃，甲烷比例下降到 48%。根据目前的结果，有可能获得相当于每 1 t/d 15 kWh 的电力生产。在监测结束时，前两个阶段的沼气产量分别为 237 和 249l-CH（4）/kg-VS，第三个阶段导致过程崩溃，产量为 61.6l-CH（4）/kg-VS。这项研究的结果表明，大多数农业沼气厂具有很大的潜力，可以显著提高产能和改进技术。
