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首页> 外文期刊>Chemical Engineering Science >Kinetic modeling of Escherichia coli and Enterococcus sp. inactivation in wastewater treatment by photo-Fenton and H2O2/UV-vis processes
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Kinetic modeling of Escherichia coli and Enterococcus sp. inactivation in wastewater treatment by photo-Fenton and H2O2/UV-vis processes

机译：大肠杆菌和肠球菌sp的动力学模型。 Fenton和H2O2 / UV-vis工艺在废水处理中的失活

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This work aims to assess the effectiveness of the photo-Fenton system for the removal of fecal bacteria in treated urban wastewater effluents, using low reagent concentrations and near neutral pH. To achieve this objective, kinetic modeling was used as a tool in the study of the influence of the different factors such as the UV-vis irradiation source, kind of bacteria, presence of H2O2 and particularly the influence of precipitated iron at near neutral pH on the inactivation of Escherichia coil and Enterococcus sp. Three inactivation treatments at pH 5 were carried out, based on a combination of UV-vis irradiation (artificial and solar) with oxidizing agents such as hydrogen peroxide (25 mg H2O2/L) and iron salts (5 mg Fe3+/L) or with each agent individually. The fitting of the experimental inactivation values to the corresponding equations through nonlinear regression techniques was carried out using the Microsoft (R) Excel tool GInaFiT (Geeraerd and Van Impe Inactivation Fitting Tool; Geeraerd et al., 2005). Ten different mathematical models were studied (Linear, Horn, Linear with shoulder, Linear with tail, Linear with shoulder and tail, Weibull, Weibull with tail, Double Weibull, Biphasic and Biphasic with shoulder). The assessment of the inactivation rates is a useful tool to know the influence of the different variables of the treatments. Thus, this assessment shows clearly that the presence of undissolved iron at pH 5 significantly decreases the inactivation rate of Enterococcus sp. in photo-Fenton treatments compared to H2O2/UV-vis treatments, while in the case of E. coli the inactivation rates are similar in both treatments. Consequently, the amount of hydroxyl radicals and reactive oxygen species (ROS) generated because of the presence of precipitated iron at pH 5 in the photo-Fenton treatments is considered as insignificant compared to the H2O2/UV-vis irradiation treatments, worsening the inactivation of Enterococcus sp. (C) 2015 Elsevier Ltd. All rights reserved.
机译：这项工作旨在使用低试剂浓度和接近中性pH值，评估光芬顿系统去除处理过的城市废水中粪便细菌的有效性。为了达到这个目的，动力学模型被用作研究诸如紫外线可见辐射源，细菌种类，H​​2O2的存在等因素的影响的工具，特别是在近中性pH值下沉淀铁的影响。灭活大肠杆菌和肠球菌。基于UV-vis辐射（人工和太阳能）与氧化剂（例如过氧化氢（25 mg H2O2 / L）和铁盐（5 mg Fe3 + / L））的组合进行了三种pH为5的灭活处理。每个代理商单独。通过使用Microsoft（R）Excel工具GInaFiT（Geeraerd和Van Impe失活拟合工具; Geeraerd等，2005），通过非线性回归技术将实验失活值拟合到相应的方程式。研究了十种不同的数学模型（线性，角形，带肩线性，带尾巴线性，带肩和尾巴线性，威布尔，带尾巴的威布尔，双威布尔，双相和双相双肩）。灭活率的评估是了解治疗不同变量的影响的有用工具。因此，该评估清楚地表明，pH 5时不溶铁的存在显着降低了肠球菌sp的失活率。在光芬顿处理中，与H2O2 / UV-vis处理相比，在大肠杆菌中，两种处理的失活率相似。因此，与H2O2 / UV-vis辐照处理相比，在光芬顿处理中由于pH为5的沉淀铁的存在而产生的羟基自由基和活性氧（ROS）的量被认为是微不足道的，这使H2O2 / UV-vis辐照处理变得更糟。肠球菌（C）2015 Elsevier Ltd.保留所有权利。

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