Studies on the removal of polyphenols from sugarcane vinasses using three upflow anaerobic sludge blanket (UASB) reactors operating isothermally at temperatures of 45, 55, and 65 °C are presented. The procedure started evaluating the stability of the reactors through the quantification of four important parameters of the process: temperature, pH, alkalinity factor, and acetic acid production. The physical and chemical characterizations of the vinasses were made to evaluate the applied treatment. Total polyphenols were quantified before and after the biochemical treatment using the Folin-Ciocalteu’s method. The obtained results showed that this biochemical treatment was not enough by itself to remove the phenolic compounds present in the vinasses feed. The use of complementary treatment for the removal of polyphenols with activated carbon was proposed and evaluated. The effectiveness of the adsorption process was analyzed and compared through the models of Langmuir, Freundlich, and Dubinin-Radushkevich, using the obtained experimental data. The model that provided the best fit of the experimental data was the Langmuir model with a correlation coefficient of 0.991. The adsorption process achieved to reduce the concentration of polyphenols in the vinasses from 3600 mg of gallic acid equivalent (GAE)/L to 1072 mg GAE/L by single-step adsorption. That is equivalent to an overall reduction of 70.2%.

中文翻译：

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在实验室规模的嗜热上流厌氧污泥覆盖反应器中进行生化处理后，使用活性炭对甘蔗油渣中的多酚进行定量和去除

提出了使用在45、55和65°C等温运行的三个上流厌氧污泥床（UASB）反应器从甘蔗酒渣中去除多酚的研究。该过程开始通过量化过程的四个重要参数来评估反应器的稳定性：温度，pH，碱度因子和乙酸产量。对酒糟进行了物理和化学表征以评估所应用的处理。使用Folin-Ciocalteu法对生化处理前后的总多酚进行定量。所得结果表明，这种生化处理本身不足以除去酒糟饲料中存在的酚类化合物。提出并评价了补充处理用于用活性炭去除多酚的方法。使用获得的实验数据，通过Langmuir，Freundlich和Dubinin-Radushkevich的模型对吸附过程的有效性进行了分析和比较。提供最佳拟合实验数据的模型是Langmuir模型，相关系数为0.991。通过一步吸附，实现了吸附过程，将酒糟中的多酚浓度从3600 mg没食子酸当量（GAE）/ L降低到1072 mg GAE / L。这相当于总体减少了70.2％。提供最佳拟合实验数据的模型是Langmuir模型，相关系数为0.991。通过一步吸附，实现了吸附过程，将酒糟中的多酚浓度从3600 mg没食子酸当量（GAE）/ L降低到1072 mg GAE / L。这相当于总体减少了70.2％。提供最佳拟合实验数据的模型是Langmuir模型，相关系数为0.991。通过一步吸附，实现了吸附过程，将酒糟中的多酚浓度从3600 mg没食子酸当量（GAE）/ L降低到1072 mg GAE / L。这相当于总体减少了70.2％。