有机负荷对醋糟厌氧消化系统启动的影响

发布时间：2018-05-13 23:08

本文选题：醋糟 + 厌氧消化　；参考：《环境科学》2017年03期

【摘要】：本研究通过醋糟的中温产甲烷潜力测试实验,考察了有机负荷对醋糟厌氧消化反应器启动的影响.并通过对不同有机负荷条件下的甲烷产量、液相组分的对比分析,结合热重、X射线衍射和红外光谱学方法进行差异表征,结果发现:1较低的有机负荷有利于缓解醋糟中有机物水解酸化过程中VFAs的积累和pH的下降,保证产甲烷过程的稳定进行.当接种物与基质VS比为1∶1[即有机负荷(以VS计)为1.78 g·(L·d)~(-1),pH=7.60]时的累积甲烷产量最高,达2 249.7 m L.随着有机负荷的提高,VFAs的累积浓度随之升高,使产甲烷过程受到不同程度的抑制并相继终止,且在接种物与基质VS比为1∶4时[即有机负荷为7.12 g·(L·d)~(-1),pH=5.52]实现了乙酸和乳酸的同步发酵(分别可达到8 000 mg·L~(-1)和2 650 mg·L~(-1)).2醋糟中木质纤维素类物质为短程有序的微晶结构或非晶结构,与富含纤维素类晶体结构物质的玉米秸秆等相比,其VS的降解率更高.醋糟中的木质素、纤维素、半纤维素的降解率随着有机负荷的降低而逐渐升高.
[Abstract]:The effects of organic loading on the start-up of anaerobic digestion reactor for vinegar lees were investigated by the test of methane production potential at medium temperature. The methane production and liquid composition under different organic loading conditions were compared and characterized by thermogravimetric X-ray diffraction (TG-XRD) and infrared spectroscopy (IR). The results showed that the lower organic load of 1 was helpful to alleviate the accumulation of VFAs and the decrease of pH in the process of hydrolytic acidification of organic matter in vinegar lees and to ensure the stability of methanogenic process. When the ratio of inoculum to substrate vs was 1:1 [that is, the organic load was 1.78g / L ~ (-1) (pH = 7.60)], the accumulative methane yield was the highest, reaching 2 249.7 mL / L. With the increase of organic load, the cumulative concentration of VFAs increased, and the methanogenic process was inhibited to some extent and terminated successively. The simultaneous fermentation of acetic acid and lactic acid (up to 8 000 mg / L ~ (-1) and lignocellulose in vinegar lees of 2 650 mg / L ~ (-1) and 2 650 mg / L ~ (-1) were achieved when the ratio of inoculum to substrate vs. 2 was 1:4 [7.12 g 路L ~ (-1) ~ (-1) (pH ~ (5. 52)]. The lignocellulosic substances in vinegar lees were microcrystalline or amorphous. Compared with corn straw which is rich in cellulose crystal structure, the degradation rate of vs is higher. The degradation rate of lignin, cellulose and hemicellulose in vinegar lees increased with the decrease of organic loading.
【作者单位】：同济大学环境科学与工程学院污染控制与资源化研究国家重点实验室;
【基金】：国家自然科学基金项目(51308402,51538008) 国家科技支撑计划项目(2014BAC31B01)
【分类号】：X792;TQ221.11

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