Experimental and numerical investigation of the breakage of wastewater flocs in orifice flow.

IF 2 Q3 Environmental Science

Water Quality Research Journal of Canada Pub Date : 2015-02-01 DOI:10.2166/WQRJC.2014.030

Aaron Fernandes, Y. Lawryshyn, J. Gibson, R. Farnood

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引用次数: 2

Abstract

It is well accepted that the breakage of wastewater suspended particles (flocs) can lead to better disinfection of effluent, especially when utilizing ultraviolet irradiation as the disinfection method. In this work, the breakage of wastewater flocs in orifice flow was investigated through numerical simulations. The strain rate along particle paths was estimated using computational fluid dynamics. Assuming that particle breakage occurs if the maximum strain rate experienced by the particle exceeds a critical threshold value, breakage of wastewater particles was predicted. The effectiveness of the model was supported by simple experiments. Based on the numerical simulations, under the same nominal orifice strain rate, particle breakage was higher in single-orifice systems compared to that of multi-orifice systems. This finding was further confirmed through experimentation. Furthermore, simulation results revealed that while single-orifice systems were the preferred choice for the breakage of strong particles, multi-orifice systems might be more effective in breaking ‘weak’ particles.

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孔板流动中污水絮凝体破碎的实验与数值研究。

人们普遍认为，废水悬浮颗粒(絮凝体)的破碎可以更好地消毒出水，特别是采用紫外线照射作为消毒方法时。本文采用数值模拟的方法，研究了污水絮凝体在孔板流动中的破碎过程。利用计算流体力学方法估计了沿颗粒路径的应变速率。假设当颗粒经历的最大应变速率超过临界阈值时，颗粒就会发生破裂，预测废水颗粒的破裂。简单的实验验证了该模型的有效性。数值模拟结果表明，在相同的名义孔应变速率下，单孔系统的颗粒破碎率高于多孔系统。实验进一步证实了这一发现。此外，模拟结果表明，虽然单孔系统是破碎强颗粒的首选，但多孔系统可能更有效地破碎“弱”颗粒。

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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来源期刊

Water Quality Research Journal of Canada WATER RESOURCES-

CiteScore

1.70

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Water Quality Research Journal publishes peer-reviewed, scholarly articles on the following general subject areas: Impact of current and emerging contaminants on aquatic ecosystems Aquatic ecology (ecohydrology and ecohydraulics, invasive species, biodiversity, and aquatic species at risk) Conservation and protection of aquatic environments Responsible resource development and water quality (mining, forestry, hydropower, oil and gas) Drinking water, wastewater and stormwater treatment technologies and strategies Impacts and solutions of diffuse pollution (urban and agricultural run-off) on water quality Industrial water quality Used water: Reuse and resource recovery Groundwater quality (management, remediation, fracking, legacy contaminants) Assessment of surface and subsurface water quality Regulations, economics, strategies and policies related to water quality Social science issues in relation to water quality Water quality in remote areas Water quality in cold climates The Water Quality Research Journal is a quarterly publication. It is a forum for original research dealing with the aquatic environment, and should report new and significant findings that advance the understanding of the field. Critical review articles are especially encouraged.