Battistoni P, Pavan P, Mata-Alvarez J, Prisciandaro M, Cecchi F
Institute of Hydraulics, Engineering Faculty, University of Ancona, Via Brecce Bianche 60131 Ancona, Italy.
Water Sci Technol. 2000;41(3):51-9.
In this paper experimental results on the anaerobic digestion of sewage sludge and organic fraction of municipal solid waste (OFMSW) by using a double phase process are reported. The long-term experiment has been carried out on a pilot scale plant, performed in different sets of operative conditions, during which granulometric distributions of particles in sludges and rheological properties of sludges were monitored. A significant fluidification of sludge was evidenced in the meso-thermo process, especially taking into account the variation in sludge behaviour from the first to the second phase. In the thermo-thermo process a fluidification higher than that shown in meso-thermo conditions is not observed, this suggesting that better results in terms of sludge conditioning can be obtained in a long time spent in thermophilic anaerobic digestion. Total volatile solids (TVS) and total fixed solids (TFS) become the most important parameters when mathematical modelling is applied to these processes. In the acidogenic phase, hydraulic retention time (HRT) and temperature are used to determine rigidity coefficient (RC), while only temperature is needed for yield stress (YC). Organic loading rate (OLR) and specific gas production (SGP) exert an important role in methanogenic phase description.
本文报道了采用双相工艺对污水污泥和城市固体废物有机组分（OFMSW）进行厌氧消化的实验结果。长期实验在中试规模的装置上进行，在不同的操作条件下进行，在此期间监测了污泥中颗粒的粒度分布和污泥的流变特性。在中温 - 高温工艺中，污泥出现了显著的流化现象，特别是考虑到污泥从第一阶段到第二阶段行为的变化。在高温 - 高温工艺中，未观察到比中温 - 高温条件下更高的流化现象，这表明在嗜热厌氧消化中花费较长时间可以在污泥调理方面获得更好的结果。当对这些过程进行数学建模时，总挥发性固体（TVS）和总固定固体（TFS）成为最重要的参数。在产酸阶段，水力停留时间（HRT）和温度用于确定刚性系数（RC），而对于屈服应力（YC）仅需要温度。有机负荷率（OLR）和特定气体产量（SGP）在产甲烷阶段描述中发挥重要作用。
