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Comparison of five wastewater COD fractionation methods for dynamic simulation of MBR systems

机译：MBR系统动态模拟的五种废水COD分馏方法的比较

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Five different wastewater COD fractionation methods were employed for simulating an experimental MBR wastewater treatment plant using WEST. The predictions of dynamic simulations using as input the data obtained according to each influent characterization methodology were compared with the results of the experimental system and differences between experimental and predicted values were analyzed in order to select the fractionation method which provides the best fitting and minimizes errors. Three of these methods were based on the determination of the biodegradable fractions using respirometric assays of real wastewater filtered through 0.45- and 0.22-μm pore size filters or adding a previous flocculation step before filtration. Moreover, a method based on physicochemical analyses and another one based on theoretical coefficients were also compared. Simulated system performance and effluent quality greatly depended upon the influent characterization and the proper model calibration. Thus the importance of selecting a suitable fractionation methodology is high, especially in MBR systems working at specific operational conditions that may alter COD fractions. In this study, MLSS in the bioreactors and sludge supernatant COD concentrations were better predicted when the influent characterization was based on respirometric methods. Both the method based on theoretical coefficients and the physicochemical method underestimated the particulate inert fraction and therefore, also the MLSS concentrations. Moreover, these results showed that for a correct effluent COD prediction in MBR systems, it is necessary to take into account that the membrane retained part of the soluble inert fraction.
机译：采用了五种不同的废水COD分馏方法来模拟使用WEST的MBR废水处理实验厂。将根据每种进水表征方法获得的数据作为输入的动态模拟的预测与实验系统的结果进行比较，并分析实验值和预测值之间的差异，以选择能够提供最佳拟合并最大程度减少误差的分馏方法。这些方法中的三种是基于对通过0.45-和0.22-μm孔径过滤器过滤的实际废水的呼吸测定法，或者在过滤之前添加先前的絮凝步骤，通过对可生物降解级分的测定来确定的。此外，还比较了一种基于理化分析的方法和另一种基于理论系数的方法。模拟的系统性能和废水质量很大程度上取决于进水特性和适当的模型校准。因此，选择合适的分馏方法的重要性很高，尤其是在可能改变COD分数的特定操作条件下工作的MBR系统中。在这项研究中，当基于呼吸测定法对进水进行表征时，可以更好地预测生物反应器中的MLSS和污泥上清液中的COD浓度。基于理论系数的方法和物理化学方法都低估了颗粒惰性成分，因此也低估了MLSS浓度。此外，这些结果表明，对于MBR系统中正确的废水COD预测，必须考虑到膜保留了可溶性惰性组分的一部分。

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