Anaerobic co-digestion of Pennisetum hybrid and pig manure: A comparative study of performance and microbial community at different mixture ratio and organic loading rate
Anaerobic co-digestion of Pennisetum hybrid and pig manure: A comparative study of performance and microbial community at different mixture ratio and organic loading rate
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狼尾草与猪粪共厌氧消化：不同混合比例和有机负荷率下性能和微生物群落的比较研究
DOI：
10.1016/j.chemosphere.2020.125871
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发表时间：
2020-05-01
期刊：
影响因子：
8.8
通讯作者：
Liu Dingfa
中科院分区：
文献类型：
--
作者：
Li Lianhua;He Shuibin;Liu Dingfa
为了研究狼尾草和猪粪共消化系统的性能和微生物群落的变化，在不同的草：粪混合比（50：50和75：25）和可变的有机负荷率（OLR）下建立了两个半连续模式的共消化系统。两个反应器在 2.0-5.0 g VS/(L.d) 的 OLR 下处于稳态，比沼气产量和体积沼气产量分别为 383.86 +/- 65.13 至 574.28 +/- 72.04 mL/g VS 和 0.87 +/- 0.07 至 2.36 +/- 0.13分别为 m(3)/(m(3).d)。混合比为 75:25 的共消化系统在 OLR 为 5.5 g VS/(L.d) 时失败。这种失败可能是由于产酸细菌和氧化细菌之间的不平衡导致挥发性脂肪酸（VFA）的积累。相比之下，混合比为 50:50 的共消解系统在 OLR 为 7.0 g VS/(L.d) 时失败，这可能是由于机械问题或反应器配置不当造成的。嗜蛋白菌属导致总氨氮的增加。这些发现为优化共消化系统、提高反应器性能和改善废物处理提供了有用的指导。 (C) 2020 Elsevier Ltd. 保留所有权利。
To investigate how the changes in performance and the microbial community of the co-digestion system of Pennisetum hybrid and pig manure, two co-digestion systems in a semi-continuous mode were established at different grass:manure mixture ratios (50:50 and 75:25), and at variable organic loading rates (OLRs). The two reactors were in a steady-state at the OLRs of 2.0-5.0 g VS/(L.d), with the specific and volumetric biogas yields of 383.86 +/- 65.13 to 574.28 +/- 72.04 mL/g VS and 0.87 +/- 0.07 to 2.36 +/- 0.13 m(3)/(m(3).d), respectively. The co-digestion system with a mixture ratio of 75:25 failed at an OLR of 5.5 g VS/(L.d). This failure could be attributed to the accumulation of volatile fatty acids (VFAs) owing to the imbalance between acid-production and -oxidation bacteria. By contrast, the co-digestion system with mixture ratio of 50:50 failed at an OLR of 7.0 g VS/(L.d), which was likely due to mechanical issues or improper reactor configuration. The genus Proteiniphilum contributed to the increase in total ammonia nitrogen. These findings provide useful guidance for optimizing co-digestion system, enhancing reactor performance and improving the wastes treatment. (C) 2020 Elsevier Ltd. All rights reserved.