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Configuration optimization of UV reactors for water disinfection with computational fluid dynamics: Feasibility of using particle minimum UV dose as a performance indicator

机译:具有计算流体动力学的用于水消毒的UV反应器的配置优化:使用微粒最小UV剂量作为性能指标的可行性

摘要

Computational fluid dynamics is a powerful tool for ultraviolet (UV) reactor performance evaluation, since it allows the reactor configuration optimization by comparing the performance indicator [e.g., reduction equivalent dose (RED)] of various UV reactors. In this study, a new performance indicator independent of the microbial UV dose-response curve, namely particle minimum UV dose (D-min), was introduced, and its feasibility was evaluated in the configuration optimization of 3-lamp UV reactors for water disinfection. Results indicate that the D-min could serve as an alternative to the RED in characterizing the UV reactor performance. In general, reactors with a normal (NOR) lamp position pattern (i.e., with one lamp on the top and two at the bottom) had larger D-min values (110-193 mW cm(-2)) than those with a reverse (REV) lamp position pattern (i.e., with two lamps on the top and one at the bottom) (98-160 mW cm(-2)). The largest D-min (193 mW cm(-2)) was obtained in an UV reactor with a lamp relative distance (i.e., the ratio of the distance between the lamp and reactor axes to the reactor radius) of 0.4 and an inlet internal diameter of 75 mm, which could be ascribed to a well-mixed flow resulting from an optimal dispersion of the influent flow by the lamp array. The maximum disinfection flow rate of the UV reactor with the optimal configuration was elevated by 47-100% compared to those of the non-optimally designed reactors, which led to an energy saving efficiency of 32-50%. (C) 2016 Elsevier B.V. All rights reserved.
机译:计算流体动力学是用于评估紫外线(UV)反应器性能的强大工具,因为它可以通过比较各种紫外线反应器的性能指标[例如还原当量(RED)]来优化反应器配置。在这项研究中,引入了一种新的性能指标,该指标独立于微生物的紫外线剂量-响应曲线,即颗粒最低紫外线剂量(D-min),并在用于水消毒的三灯紫外线反应器的配置优化中评估了其可行性。 。结果表明,D-min可以替代RED,以表征UV反应器的性能。通常,具有正常(NOR)灯位置模式(即,顶部有一个灯,底部有两个灯)的反应堆的D-min值(110-193 mW cm(-2))比具有反向的反应堆大。 (REV)灯的位置模式(即,顶部有两个灯,底部有一个灯)(98-160 mW cm(-2))。在UV反应器中获得最大的D-min(193 mW cm(-2)),其中灯的相对距离(即灯和反应器轴之间的距离与反应器半径的比)为0.4,入口内部直径为75毫米,这可以归因于灯阵列对进水流的最佳分散所产生的充分混合的进水。与非最佳设计的反应器相比,具有最佳配置的紫外线反应器的最大消毒流速提高了47-100%,从而实现了32-50%的节能效率。 (C)2016 Elsevier B.V.保留所有权利。

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