A Study on Behavior of Substrate Degradation, Interaction of the Anaerobic Bacterial Groups and Upgrading of Process in Anaerobic Digestion

通过在35ﾟC下进行间歇和连续试验，研究了废旧活性污泥(WAS)、纤维素和复合污泥在厌氧消化中的降解特性，得出以下结论：(1)与纤维素和由废旧活性污泥和纤维素组成的复合污泥相比，废旧活性污泥较难降解：(2)污泥组成对消化池产气量和甲烷产率有显著影响；(3)作为三氧化二胺和复合污泥厌氧消化全过程的限速步骤，可降解颗粒有机物的水解率可用线性方程表示，经过热预处理后，三氧化二胺的厌氧降解性和产气量大大提高，厌氧消化所需的停留时间有可能达到5天。提纯…的最佳前处理温度和时间厌氧消化过程中，温度和水力停留时间对厌氧消化产酸特性的影响分别为170ﾟC和60min。结果表明，温度和水力停留时间对底物的降解效率、挥发性脂肪酸组成以及产酸菌和产甲烷菌的分布有显著影响。利用实验室规模的厌氧床反应器，考察了底物组成和高体积负荷对厌氧两相消化产甲烷相底物去除和生物膜形成特性的影响。结果表明，在底物中加入少量酵母膏或葡萄糖，可提高底物的去除效率，促进生物膜的形成。当负荷增加到30kgCOD/m~(-3)d时，底物的去除效率也高达98.8%。较少

The degradation characteristics of waste activated sludge (WAS), cellulose and the complex sludge in anaerobic digestion were investigated by conducting the batch and continuous experiments at 35ﾟC by this investigation, the following conclusions were reached : (1) the WAS was difficult to be degraded, compared with the cellulose and the complex sludge which composed of WAS and cellulose ; (2) the digester gas production and percentage of methane from complex sludge were significanthly affected by the composition of sludge ; (3) the rate-limiting step of overall process in anaerobic digestion of WAS and complex sludge, the hydrolysis rate of degradable particulate organic matter is expressed as a linear equation.Through the thermal pretreatment, the anaerobic degradability of WAS and the gas production from WAS were greatly increased, and the retention time necessary for anaerobic digestion was possible to be by 5 days. The optimum pretreatment temperature and pretreatment time for upg … More rading of anaerobic digestion of WAS were 170ﾟC and 60 minutes, respectively.Effects of temperature and hydraulic retention time (HRT) on the characteristics of acidogenesis in anaerobic digestion were investigated using anaerobic chemostat-type reactor which soluble starch was fed as a substrate. it was elucidated that the degradation efficiency of substrate, the composition of volatile fatty acids produced and the distribution of acidogenic bacteria and methanogenic bacteria were significantly affected by the temperature and HRT.The effects of substrate composition and high volumetric loading rate on the characteristics of substrate removal and biofilm formation in methanogenic phase of anaerobic two-phase digestion were investigated by using laboratory-scale anaerobic fluidized bed reactor. It was found that the substrate removal efficiencies were increased and the biofilm formation was accelerated by adding a small quantity of yeast extract or glucose to the substrate. While the loading rate increased to 30 kgCOD/m^3 day, the substrate removal efficiencies were also high as 98.8%. Less