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首页> 外文会议>Water Environment Federation annual technical exhibition & conference;WEFTEC 2002 >SIDE-BY-SIDE HYDRODYNAMIC MODELING AND FULL-SCALE HYDRAULIC TESTING OF SECONDARY CLARIFIERS
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SIDE-BY-SIDE HYDRODYNAMIC MODELING AND FULL-SCALE HYDRAULIC TESTING OF SECONDARY CLARIFIERS

机译：二级校验器的并排流体动力学建模和大规模液压测试

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摘要

Secondary clarifiers are a fundamental element of the contemporary wastewater treatmentprocess. The complex and often misunderstood nature of their function has historically requireddesigners to employ rule of thumb criteria or empirical observations, including significant safetyfactors, to provide acceptable performance. Recently, solids flux theory has gained uniformacceptance as an important tool for proper clarifier design and evaluation. Hydrodynamicmodeling adds computational fluid dynamics (CFD) to solids flux theory to provide a fully massconservative model capable of predicting clarifier effluent performance. The use ofhydrodynamic modeling, coupled with full scale testing to calibrate the model, demonstrateditself as a highly accurate method which is capable of predicting settling failure. Furthermore, theresults obtained from the full scale testing conducted on the City of Santa Rosa LagunaSubregional Water Reclamation Facility secondary clarifiers indicate that currently accepteddesign methods for energy dissipating inlets (EDI) may not provide the most optimal solidsremoval performance during peak flow conditions. Of the 5 clarifiers evaluated, the unit withouta bottom on the EDI produced significantly better performance at peak flows over those withmore conventional enclosed EDI’s. The hydrodynamic model confirmed the results obtained inthe field work, and additionally indicated that improved secondary clarification performance atpeak flows could potentially be obtained by removal of the EDI bottom from the other fourevaluated clarifiers.
机译：二级澄清池是当代废水处理过程的基本要素。从历史上看，其功能的复杂性和经常被误解的性质要求设计人员采用经验法则或经验观察（包括重要的安全因素）来提供可接受的性能。近年来，固体通量理论已成为均匀澄清器设计和评估的重要工具，已被一致接受。流体动力学建模将计算流体动力学（CFD）添加到了固体通量理论中，从而提供了一种能够预测澄清池出水性能的完全质量守恒的模型。使用流体力学建模，再加上全面测试来校准模型，证明了自己是一种能够预测沉降失败的高精度方法。此外，从对圣罗莎拉古纳市分区域水回收设施二级澄清池进行的全面测试获得的结果表明，目前公认的消能口（EDI）设计方法可能无法在峰值流量条件下提供最佳的固相去除性能。在所评估的5台澄清池中，EDI没有底部的装置在峰值流量方面的性能明显优于传统封闭EDI的装置。流体力学模型证实了在现场工作中获得的结果，并另外表明，通过从其他四个评估的澄清池中去除EDI底部，有可能潜在地获得改善的峰值澄清性能。

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