Numerical analysis of the circular settling tank

Q2 Engineering

Drinking Water Engineering and Science Pub Date : 2019-04-17 DOI:10.5194/DWES-12-39-2019

Elahe Chero, M. Torabi, Hamidreza Zahabi, Anahita Ghafoorisadatieh, K. Bina

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引用次数: 8

Abstract

Abstract. Nowadays, a settling tank's removal efficiency is one of the most crucial matters for all water or wastewater treatment plants (WTPs or WWTPs). The unit can affect WWTP performance and improve the provided effluent quality. In this paper, the geometrical aspects of a settling tank were numerically analyzed via tracer curves, the finite-volume method, and ANSYS CFX software in which the baffle depth and diameter of a settling tank were assessed. Firstly, a previous study was similarly remodeled to verify simulation results. The impact of tank depth variation was numerically assessed where the outcomes showed that a deeper tank could raise discharge time or the hydraulic retention time (HRT). Thus, extensive discharge time may result in less polluted effluent, degrading more solids. However, the tank should not be too deeply based on costs. Moreover, the differential effect of baffle height was analyzed and indicated that lower height is more useful for boosting the HRT. An investigation of tank diameter changes also revealed that wider diameters bring about a broader HRT.

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圆形沉降池的数值分析

摘要如今，沉淀池的去除效率是所有水或废水处理厂（WTP或WWTP）最关键的问题之一。该装置可以影响污水处理厂的性能，并提高供水质量。本文通过示踪曲线、有限体积法和ANSYS CFX软件对沉淀池的几何方面进行了数值分析，其中评估了沉淀池的挡板深度和直径。首先，对之前的一项研究进行了类似的改造，以验证模拟结果。对储罐深度变化的影响进行了数值评估，结果表明，更深的储罐可以增加排放时间或水力停留时间（HRT）。因此，延长排放时间可以减少污水污染，降解更多固体。然而，储罐不应过于依赖成本。此外，还分析了挡板高度的不同影响，表明挡板高度越低，HRT越有利于提高。对储罐直径变化的调查还表明，更宽的直径会带来更宽的HRT。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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