Department of Chemical Engineering and Food Technology, Faculty of Science, University of Cádiz, 11510 Puerto Real, Cádiz, Spain.
Bioresour Technol. 2011 Jan;102(2):606-11. doi: 10.1016/j.biortech.2010.07.124. Epub 2010 Aug 6.
Solid retention time (SRT) is a very important operational variable in continuous and semicontinuous waste treatment processes since the organic matter removal efficiency--expressed in terms of percentage of Dissolved Organic Carbon (% DOC) or Volatile Solids (% VS) removed--and the biogas or methane production are closely related with the SRT imposed. Optimum SRT is depending on the waste characteristics and the microorganisms involved in the process and, hence, it should be determined specifically in each case. In this work a series of experiments were carried out to determine the effect of SRT, from 40 to 8 days, on the performance of the dry (30% Total Solids) thermophilic (55°C) anaerobic digestion of organic fraction of Municipal Solid Wastes (OFMSW) operating at semicontinuous regime of feeding. The experimental results show than 15days is the optimum SRT (the best between all proved) for this process. Besides, data of organic matter concentration and methane production versus SRT have been used to obtain the kinetic parameters of the kinetic model of Romero García (1991): the maximum specific growth rate of the microorganisms (μmax=0.580 days(-1)) and the fraction of substrate non-biodegradable (α=0.268).
固体停留时间（SRT）是连续和半连续废物处理过程中非常重要的操作变量，因为有机物去除效率 - 以溶解有机碳（DOC）的百分比或挥发性固体（VS）去除的百分比表示 - 与沼气或甲烷的产生密切相关与施加的 SRT 有关。最佳 SRT 取决于废物特性和参与该过程的微生物，因此，应在每种情况下具体确定。在这项工作中，进行了一系列实验，以确定 SRT（从 40 天到 8 天）对以半连续进料方式运行的市政固体废物（OFMSW）有机部分在高温（55°C）厌氧消化的性能的影响在干（30％总固体）条件下。实验结果表明，15 天是该过程的最佳 SRT（所有已证明的最佳值）。此外，还使用有机物浓度和甲烷产量与 SRT 的数据来获得 Romero García（1991）动力学模型的动力学参数：微生物的最大比生长速率（μmax=0.580 天（-1））和不可生物降解底物的分数（α=0.268）。
