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

通过35 ℃下的间歇和连续试验，研究了废弃活性污泥、纤维素及复合污泥在厌氧消化中的降解特性，得出以下结论：（1）与纤维素及由废弃活性污泥和纤维素组成的复合污泥相比，废弃活性污泥较难降解;（2）污泥组成对复合污泥的产气量和产甲烷率有显著影响;（3）整个过程的限速步骤在WAS和复合污泥的厌氧消化中，可降解颗粒有机物的水解速率用线性方程表示，通过热预处理，废水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可达5天。upg的最佳预处理温度和预处理时间 ...更多信息 以可溶性淀粉为底物，采用恒化型厌氧反应器，研究了温度和水力停留时间（HRT）对厌氧消化产酸特性的影响。阐明了基质的降解效率，温度和水力停留时间对产酸菌和产甲烷菌的分布及挥发性脂肪酸的组成有显著影响。规模厌氧流化床反应器结果表明，在基质中添加少量的酵母提取物或葡萄糖，可以提高基质的去除效率，加速生物膜的形成。当负荷增加到30 kgCOD/m^3·d时，基质去除率仍高达98.8%。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