颗粒污泥与活性污泥在重力驱动旋流场中分离性能的数值研究

IF 6.3 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of water process engineering Pub Date : 2025-05-01 DOI:10.1016/j.jwpe.2025.107842

Fei Huang , Yuantao Zhang , Jinyi Tian

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引用次数: 0

摘要

在连续流工艺中培养好氧颗粒污泥（AGS）需要一个外部颗粒污泥和絮凝活性污泥分离器，以返回沉降较快的颗粒污泥。实验研究证实，水力旋流器是解决这一问题的有效方法。采用CFD数值模拟方法对不同安装角度下旋流器的运行性能进行了研究。此外，还探讨了重力驱动水力旋流器增强颗粒污泥和活性污泥分离的原理，以及水力旋流器促进造粒的原理。劈裂比和分离效率一般与安装角度成正比，最佳角度范围为- 15°~15°。活性污泥表现出较好的流动可分离性，流速波动较小，而颗粒污泥表现出更明显的流速变化。结果表明，倾斜重力驱动旋流器对颗粒污泥和活性污泥的分离性能差异有限。因此，水力旋流器促进造粒的潜在原因可能不是传统认为的分离效应，而是水力剪切流场引起的颗粒运动。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Numerical study of the separation performance of granular sludge and activated sludge in gravity-driven cyclonic field

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Numerical study of the separation performance of granular sludge and activated sludge in gravity-driven cyclonic field

The cultivation of aerobic granular sludge (AGS) in a continuous flow process requires an external granular sludge and flocculent activated sludge separator to return the faster settling granular sludge. Experimental studies have confirmed that hydrocyclones are an effective solution for this purpose. This study employed CFD numerical simulations to investigate the operational performance of hydrocyclones at different installation angles. Furthermore, it explored the principles of gravity-driven hydrocyclone-enhanced separation of granular sludge and activated sludge, as well as the hydrocyclone-promoted granulation. The split ratio and separation efficiency are generally proportional to the installation angle, with the optimal angle range identified as −15°~15°. Activated sludge shows a better flow separability with low velocity fluctuations, whereas granular sludge shows more pronounced velocity variations. The results indicate that the inclined gravity-driven hydrocyclone exhibit only a limited difference in separation performance between granular sludge and activated sludge. Therefore, the potential reason for the hydrocyclone-promoted granulation may not be the traditionally considered separative effect, but rather the particle motion induced by the hydraulic shear flow field.

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来源期刊

Journal of water process engineering Biochemistry, Genetics and Molecular Biology-Biotechnology

CiteScore

10.70

自引率

8.60%

发文量

846

审稿时长

24 days

期刊介绍： The Journal of Water Process Engineering aims to publish refereed, high-quality research papers with significant novelty and impact in all areas of the engineering of water and wastewater processing . Papers on advanced and novel treatment processes and technologies are particularly welcome. The Journal considers papers in areas such as nanotechnology and biotechnology applications in water, novel oxidation and separation processes, membrane processes (except those for desalination) , catalytic processes for the removal of water contaminants, sustainable processes, water reuse and recycling, water use and wastewater minimization, integrated/hybrid technology, process modeling of water treatment and novel treatment processes. Submissions on the subject of adsorbents, including standard measurements of adsorption kinetics and equilibrium will only be considered if there is a genuine case for novelty and contribution, for example highly novel, sustainable adsorbents and their use: papers on activated carbon-type materials derived from natural matter, or surfactant-modified clays and related minerals, would not fulfil this criterion. The Journal particularly welcomes contributions involving environmentally, economically and socially sustainable technology for water treatment, including those which are energy-efficient, with minimal or no chemical consumption, and capable of water recycling and reuse that minimizes the direct disposal of wastewater to the aquatic environment. Papers that describe novel ideas for solving issues related to water quality and availability are also welcome, as are those that show the transfer of techniques from other disciplines. The Journal will consider papers dealing with processes for various water matrices including drinking water (except desalination), domestic, urban and industrial wastewaters, in addition to their residues. It is expected that the journal will be of particular relevance to chemical and process engineers working in the field. The Journal welcomes Full Text papers, Short Communications, State-of-the-Art Reviews and Letters to Editors and Case Studies