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外源生物強化下水稻秸稈好氧-厭氧兩相發(fā)酵產(chǎn)甲烷特性研究
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國家自然科學(xué)基金項目(52306228)、黑龍江省自然科學(xué)基金項目(LH2021E005)、廣東省新能源和可再生能源研究與發(fā)展重點實驗室開放項目(E239kf0501)、黑龍江省博士后科研啟動基金項目(LBH-Q21067)和黑龍江省“揭榜掛帥”科技攻關(guān)項目(2022ZXJ05C02)


Effect of Exogenous Biological Enhancement on Methane Production Characteristics of Aerobic anaerobic Two-phase Fermentation of Rice Straw
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    摘要:

    采用生物強化方法強化水稻秸稈好氧水解過程,并研究綠色木霉及添加量(占總料液質(zhì)量分數(shù)3%、5%、7%和9%)對其發(fā)酵特性的影響。好氧水解階段生物強化時間為24h,隨后在35℃條件下進行厭氧發(fā)酵產(chǎn)甲烷潛力測試試驗。結(jié)果表明,與對照組相比,添加綠色木霉進行生物強化各組的木質(zhì)纖維素降解率、揮發(fā)性脂肪酸(VFAs)產(chǎn)量及產(chǎn)氣率均有不同程度的提高,VFAs均以乙酸為主。利用Modified Gompertz對累積產(chǎn)甲烷量進行擬合,擬合結(jié)果較好,綠色木霉添加量為3%、5%、7%、9%的各預(yù)處理試驗組累積產(chǎn)甲烷量分別為198.28、211.351、228.44、234.78mL/g,比CK對照組產(chǎn)甲烷量分別提高18.89%、26.72%、36.96%、40.76%,添加7%綠色木霉組的綜合效果最好,在此條件下半纖維素、纖維素、木質(zhì)素降解率分別為36.86%、31.57%、7.43%,甲烷產(chǎn)量較CK組提高36.96%。好氧水解過程中優(yōu)勢菌群為厚壁菌門(Firmicutes)、綠彎菌門(Chloroflexi)、變形菌門(Proteobacteria)、擬桿菌門(Bacteroidetes)等,其中厚壁菌門(Firmicutes)相對豐度隨水解時間的延長而減少,綠彎菌門(Chloroflexi)和擬桿菌門(Bacteroidetes)相對豐度增加,表明添加菌劑能夠改變菌群結(jié)構(gòu),促進好氧水解反應(yīng)的進行。

    Abstract:

    The aerobic hydrolysis process of rice straw was enhanced by biological reinforcement method, and the effects of green Trichoderma and its addition amount (3%, 5%, 7%, and 9% of the total feed mass fraction) on its fermentation characteristics were studied. The biological enhancement time in the aerobic hydrolysis reactor was 24h, followed by anaerobic fermentation methane production potential testing under 35℃ conditions.The results showed that compared with the control group, the addition of Trichoderma viride for biological enhancement resulted in varying degrees of improvement in the degradation rate of lignocellulose, production of volatile fatty acids (VFAs), and gas production rate in each group, with acetic acid being the main component of VFAs. The cumulative methane production was fitted by using Modified Gompertz, and the fitting results were good. The cumulative methane production of each pre-treatment experimental group with 3%, 5%, 7%, and 9% addition of Trichoderma viride was 198.28mL/g, 211.351mL/g, 228.44mL/g, and 234.78mL/g, respectively. Compared with that of the CK control group, the methane production was increased by 18.89%, 26.72%, 36.96%, and 40.76%, respectively. The results showed that the comprehensive effect of adding 7% Trichoderma viride was the best. Under these conditions, the degradation rates of hemicellulose,cellulose and lignin were 36.86%, 31.57%, and 7.43%, respectively, and the methane production was increased by 36.96%. The dominant bacterial communities during aerobic hydrolysis were Firmicutes, Chloroflexi, Proteobacteria, and Bacteroidetes. Among them, the relative abundance of Firmicutes was decreased with the prolongation of hydrolysis time, while the relative abundance of Chloroflexi and Bacteroidetes was increased, indicating that the addition of microbial agents could change the structure of bacterial communities and promote the progress of aerobic hydrolysis reaction.

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何董,羅立娜,徐名漢,劉瑩,丁清華,孫勇,秦楠.外源生物強化下水稻秸稈好氧-厭氧兩相發(fā)酵產(chǎn)甲烷特性研究[J].農(nóng)業(yè)機械學(xué)報,2024,55(8):401-409. HE Dong, LUO Li’na, XU Minghan, LIU Ying, DING Qinghua, SUN Yong, QIN Nan. Effect of Exogenous Biological Enhancement on Methane Production Characteristics of Aerobic anaerobic Two-phase Fermentation of Rice Straw[J]. Transactions of the Chinese Society for Agricultural Machinery,2024,55(8):401-409.

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  • 收稿日期:2023-12-04
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