酒糟厌氧消化产甲烷特性与微生物菌群结构分析
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山东省自然科学基金项目(ZR2020QE240)、金华市科技计划项目(2022-3-066)和烟台市校地融合项目(2019XDRHXMQT36)


Performance of Methane Production and Microbial Structure Distribution for Vinasse Anaerobic Digestion
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    摘要:

    酒糟是酿酒生产过程中的副产物,以酒糟为研究对象,分别考察不同底物总固体(Total solid, TS)质量分数(0.5%、1%、1.5%、2%)、接种比(接种污泥与酒糟的挥发性固体质量比)(0.25、0.5、0.75、1、1.5)和温度(25、37、50℃)条件下酒糟的厌氧消化产甲烷特性。结果表明,随着TS浓度的增加,产甲烷量逐渐增加, 2%TS条件下可获得最大的累计产沼气量(532.8mL/g)和产甲烷量(294.7mL/g)。接种比是影响厌氧消化系统的重要因素,随着接种比的增大,系统累计产沼气和产甲烷量呈先增加后减少的趋势,在接种比为0.25和0.5的条件下,系统发生崩溃,并未产甲烷,当接种比为1时,获得最大的累计产沼气和甲烷量。当TS质量分数为2%、接种比为1.5、发酵温度为50℃的条件下,获得最大的累计产沼气量为559.4mL/g,相较37℃条件下提高了10.2%,而获得的累计产甲烷量为284.0mL/g,相较37℃并未显著提升(P>0.05)。利用修正的Gompertz模型进行产气动力学分析后,发现TS质量分数越高、接种比越大、温度越高,产甲烷迟滞期越短。同时对不同温度反应体系中的微生物群落进行了分析,发现Bacteroidetes和 Firmicutes为优势菌门,随着温度的升高,产甲烷菌逐渐由氢营养型代替乙酸营养型。因此, TS浓度、接种比和温度是厌氧发酵重要因素,初步确定2%TS、接种比为1的中温酒糟厌氧发酵产甲烷性能相对较好。

    Abstract:

    Vinasse is a by-product in the process of wine production. Vinasse were used as the research object. The effects of different substrate total solids (TS) concentrations (0.5%, 1%, 1.5%, and 2%), inoculation and vinasse ratios (0.25, 0.5, 0.75, 1, and 1.5), and temperatures (25℃, 37℃, and 50℃) on performance of methane production for vinasse AD were investigated. The results showed that methane production was increased gradually with the increase of TS concentration, and the maximum cumulative biogas production (532.8mL/g) and methane production (294.7mL/g) were obtained at 2% TS. The inoculation ratio was an important factor affecting the anaerobic digestion system, with the increase of inoculation ratio, the cumulative biogas and methane production of the system showed an increasing and then decreasing trend, the system collapsed and did not produce methane at inoculation ratios of 0.25 and 0.5, and the maximum cumulative biogas and methane production were obtained when the inoculation ratio was 1. When TS was 2%, and inoculation ratio was 1.5, the cumulative biogas production obtained at a fermentation temperature of 50℃ was 559.4mL/g, which was 10.2% higher than that at 37℃, and the cumulative methane production obtained was 284.0mL/g, which was not significantly higher than that at 37℃ (P>0.05). After gas production kinetic analysis by using the modified Gompertz model, it was found that the higher the TS was, the higher the inoculum ratio and the temperature were, and the shorter the methane production latency period was. The microbial communities in the AD system at different temperatures were also analyzed, and it was found that Bacteroidetes and Firmicutes were the dominant phyla, and the methanogenic bacteria were gradually replaced by hydrogenotrophic instead of acetoclastic methanogens with the increase of temperature. Therefore, TS concentration, inoculation ratio and temperature were important factors for AD, and it was initially determined that the methanogenic performance of vinasse mesophilic AD with 2%TS and an inoculation ratio of 1 was relatively good, and the research result can provide data support for the application of vinasse AD technology.

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柳珊,郭春春,何荣玉,王淳,马艳芳,董仁杰.酒糟厌氧消化产甲烷特性与微生物菌群结构分析[J].农业机械学报,2023,54(s1):338-349,380. LIU Shan, GUO Chunchun, HE Rongyu, WANG Chun, MA Yanfang, DONG Renjie. Performance of Methane Production and Microbial Structure Distribution for Vinasse Anaerobic Digestion[J]. Transactions of the Chinese Society for Agricultural Machinery,2023,54(s1):338-349,380.

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  • 收稿日期:2023-05-20
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  • 在线发布日期: 2023-12-10
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