厨余垃圾与稻壳共消化的混合比对沼气产量的影响和底物与接种物的比例。
Effect of mixing ratio of food waste and rice husk co-digestion and substrate to inoculum ratio on biogas production.
机构信息
Department of Environmental Sciences, Quaid-i-Azam University, Islamabad 45320, Pakistan.
Environmental Engineering and Management, School of Environment, Resources and Development, Asian Institute of Technology, Bangkok, Thailand.
出版信息
Bioresour Technol. 2015 Aug;190:451-7. doi: 10.1016/j.biortech.2015.02.105. Epub 2015 Mar 10.
Aim of this study was to find out suitable mixing ratio of food waste and rice husk for their co-digestion in order to overcome VFA accumulation in digestion of food waste alone. Four mixing ratios of food waste and rice husk with C/N ratios of 20, 25, 30 and 35 were subjected to a lab scale anaerobic batch experiment under mesophilic conditions. Highest specific biogas yield of 584L/kgVS was obtained from feedstock with C/N ratio of 20. Biogas yield decreased with decrease in food waste proportion. Further, fresh cow dung was used as inoculum to investigate optimum S/I ratio with the selected feedstock. In experiment 2, feedstock with C/N ratio 20 was subjected to anaerobic digestion at five S/I ratios of 0.25, 0.5, 1.0, 1.5 and 2.0. Specific biogas yield of 557L/kgVS was obtained at S/I ratio of 0.25. However, VFA accumulation occurred at higher S/I ratios due to higher organic loadings.
本研究旨在找出适合的厨余垃圾和稻壳混合比例，以克服单独消化厨余垃圾时 VFA 积累的问题。将四种不同厨余垃圾和稻壳的混合比例（C/N 比分别为 20、25、30 和 35）进行了实验室规模的中温厌氧批式实验。在 C/N 比为 20 的进料条件下，获得了最高的特定沼气产量 584L/kgVS。沼气产量随厨余垃圾比例的降低而降低。此外，新鲜牛粪被用作接种物，以研究所选原料的最佳 S/I 比。在实验 2 中，C/N 比为 20 的原料在五个 S/I 比（0.25、0.5、1.0、1.5 和 2.0）下进行了厌氧消化。在 S/I 比为 0.25 时，获得了 557L/kgVS 的特定沼气产量。然而，由于较高的有机负荷，在较高的 S/I 比下会发生 VFA 积累。
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