Escuela de Ingeniería Bioquímica, Pontificia Universidad Católica Valparaíso, Avenida Brasil 2085, 234000, Valparaíso, Chile.
Escuela de Ingeniería Bioquímica, Pontificia Universidad Católica Valparaíso, Avenida Brasil 2085, 234000, Valparaíso, Chile.
J Environ Manage. 2018 Sep 15;222:141-147. doi: 10.1016/j.jenvman.2018.05.030. Epub 2018 May 26.
An important variability in the experimental results in anaerobic digestion lab test has been reported. This study presents a meta-analysis coupled with multivariate analysis aiming to assess the impact of this experimental variability in batch and continuous operation at mesophilic and thermophilic anaerobic digestion of waste activated sludge. An analysis of variance showed that there was no significant difference between mesophilic and thermophilic conditions in both continuous and batch conditions. Concerning the operation mode, the values of methane yield were significantly higher in batch experiment than in continuous reactors. According to the PCA, for both cases, the methane yield is positive correlated to the temperature rises. Interestingly, in the batch experiments, the higher the volatile solids in the substrate was, the lowest was the methane production, which is correlated to experimental flaws when setting up those tests. In continuous mode, unlike the batch test, the methane yield is strongly (positively) correlated to the organic content of the substrate. Experimental standardization, above all, in batch conditions are urgently necessary or move to continuous experiments for reporting results. The modeling can also be a source of disturbance in batch test.
已有报道称，在厌氧消化实验室测试中，实验结果存在重要的变异性。本研究采用荟萃分析与多元分析相结合的方法，旨在评估在中温和高温条件下，分批和连续运行对废活性污泥厌氧消化的这种实验变异性的影响。方差分析表明，在分批和连续条件下，中温和高温条件之间没有显著差异。关于运行模式，批处理实验中的甲烷产率明显高于连续反应器。根据 PCA，对于两种情况，甲烷产率与温度升高呈正相关。有趣的是，在批处理实验中，底物中的挥发性固体越高，甲烷产量越低，这与设置这些测试时的实验缺陷有关。在连续模式下，与批处理实验不同，甲烷产率与底物的有机含量呈强（正）相关。首先，迫切需要对批处理条件进行实验标准化，或者进行连续实验以报告结果。模型也可能是批处理实验中的干扰源。
