Southern Research and Outreach Center, University of Minnesota, 35838 120th Street, Waseca, MN 56093, USA.
Bioresour Technol. 2010 Jun;101(11):4042-7. doi: 10.1016/j.biortech.2010.01.052. Epub 2010 Feb 9.
Co-digesting swine manure with three agricultural residues, i.e., corn stalks, oat straw, and wheat straw, to enhance biogas productivity was investigated in this study. A 3x3 experimental design with duplicates was adopted (3 crop residuesx3 carbon/nitrogen ratios) to examine the improvement of batch digestion in terms of biogas volume produced, CH(4) content in the biogas, and net CH(4) volume. The crop residues were first cut into small sections and then ground into fine particles smaller than 40 mesh size (0.422mm) before being added to digesters. All the digesters were run simultaneously under controlled temperature at 37+/-0.1 degrees C. The length of experiment was 25days. The results showed that all crop residues significantly increased biogas production and net CH(4) volume at all C/N ratios, among which corn stalks performed the best with increase in daily maximum biogas volume by 11.4-fold as compared to the control, followed by oat straw (8.45-fold) and wheat straw (6.12-fold) at the C/N ratio of 20/1, which was found to be the optimal C/N ratio for co-digestion in the present study. In addition, corn stalks achieved the highest CH(4) content in the biogas ( approximately 68%), which was about 11% higher than that of oat straw ( approximately 57%), whereas wheat straw and the control both had produced biogas with approximately 47% CH(4) content. Wheat straw demonstrated a lower biogas productivity than corn stalks and oat straw even it had a higher carbon content (46%) than the latter two residues (39%).
本研究旨在通过与三种农业废弃物（玉米秸秆、燕麦秸秆和麦秸）共消化猪粪来提高沼气产量。采用 3x3 实验设计并进行了重复实验（3 种农作物 x3 种碳/氮比），以检查批量消化在沼气产量、沼气中的甲烷含量和净甲烷体积方面的改善情况。农作物先切成小块，然后粉碎成小于 40 目（0.422mm）的细颗粒，然后再添加到消化器中。所有消化器在 37+/-0.1 摄氏度的控制温度下同时运行。实验持续了 25 天。结果表明，所有农作物在所有 C/N 比下都显著提高了沼气产量和净甲烷体积，其中玉米秸秆的效果最好，与对照相比，每日最大沼气体积增加了 11.4 倍，其次是燕麦秸秆（8.45 倍）和麦秸（6.12 倍），在 20/1 的 C/N 比下，这被发现是本研究中共消化的最佳 C/N 比。此外，玉米秸秆产生的沼气中甲烷含量最高（约 68%），比燕麦秸秆（约 57%）高约 11%，而麦秸和对照组产生的沼气中甲烷含量约为 47%。尽管麦秸的碳含量（46%）高于后两种残留物（玉米秸秆和燕麦秸秆分别为 39%），但其沼气生产力低于玉米秸秆和燕麦秸秆。
