Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aoba, Aramaki-Aza, Aoba-Ku, Sendai, Miyagi 980-8579, Japan.
Department of Frontier Science for Advanced Environment, Graduate School of Environmental Sciences, Tohoku University, 6-6-20 Aoba, Aramaki-Aza, Aoba-Ku, Sendai, Miyagi 980-8579, Japan.
Sci Total Environ. 2018 Sep 1;634:1222-1230. doi: 10.1016/j.scitotenv.2018.03.341. Epub 2018 Apr 18.
In order to optimize the biogas recovery from the co-digestion of food waste (FW) and paper waste (PW), the effect of PW content on two-phase anaerobic digestion (TPAD) was investigated. The mixtures of FW and PW, with the ratios of 10:0, 8:2, 6:4 and 5:5 (total solids), were fed into TPAD to recover biomethane. After the long-term expriment, it is elucidated that the methanogenesis in TPAD was stable for PW ≤ 40%. When PW = 50%, NHHCO was added to the methanogenic phase to provide nitrogen. As the indicators of the stability of the anaerobic process, the ammonia and alkalinity in the methanogenic phase were simulated for their decreasing trend. The simulation results quantified the nitrogen deficiency in the methanogenic phase for PW = 50%. Also, the comparison of alkalinity and ammonia revealed that ammonia was the major contributor to the alkalinity. Furthermore, via stoichiometric calculations, high C/N ratios were found to increase the microbial yield and exacerbated the nitrogen deficiency. In the energy estimation, adding PW showed significant increase only when PW ≥ 40%. It was concluded that 40% was the optimal PW content for bioenergy augmentation from co-digestion of FW and PW using TPAD.
为了优化从食物垃圾 (FW) 和纸垃圾 (PW) 共消化中回收沼气，研究了 PW 含量对两相厌氧消化 (TPAD) 的影响。将 FW 和 PW 的混合物（总固体）按 10:0、8:2、6:4 和 5:5 的比例进料到 TPAD 中以回收生物甲烷。经过长期实验，阐明了在 PW≤40%时，TPAD 中的产甲烷过程稳定。当 PW=50%时，向产甲烷相中添加 NHHCO3 以提供氮。作为厌氧过程稳定性的指标，模拟了产甲烷相中氨和碱度的下降趋势。模拟结果量化了 PW=50%时产甲烷相中氮的缺乏。此外，通过化学计量计算，发现高 C/N 比会增加微生物产量并加剧氮缺乏。在能量估算中，仅当 PW≥40%时，添加 PW 才会显示出显著增加。结论是，对于使用 TPAD 从 FW 和 PW 的共消化中增加生物能源，40%是 PW 的最佳含量。
