Implementation of CFD modeling in the performance assessment and optimization of secondary clarifiers: the PVSC case study.
Implementation of CFD modeling in the performance assessment and optimization of secondary clarifiers: the PVSC case study.
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CFD 建模在二次澄清器性能评估和优化中的实施：PVSC 案例研究。
DOI：
10.2166/wst.2013.280
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
J. Fillos
中科院分区：
文献类型：
--
作者：
S. Xanthos;K. Ramalingam;S. Lipke;B. Mckenna;J. Fillos
水务行业，特别是废水处理部门，面临着不断增加的压力，要求它们优化现有和新的设施，以达到排放限制并降低总成本。重力分离固体，产生澄清的溢流和增稠的固体底流，长期以来一直是处理二级出水的主要分离工艺之一。最终沉淀池(FST)是处理过程中的中心环节，当需要满足高通量要求时，它往往是达到最大固体处理能力的限制步骤。帕塞伊克山谷污水处理委员会(PVSC)有兴趣使用计算流体力学(CFD)建模方法来探索任何进一步的FST改造替代方案，以维持显著更高的工厂进水流量，特别是在潮湿的天气条件下。具体来说，有兴趣修改和/或升级/优化现有的FST，以处理每天2.8亿-7.2亿加仑(MGD)(12.25-31.55m(3)/S)的流量，符合工厂对总悬浮固体(TSS)的排放限制。将讨论该特定工厂的CFD模型开发，将给出2D和3D模拟结果，并将回顾两种FST出水堰结构设计在流量为550 mGD(∼24 m(3)/S)和1,800 mg/L MLSS(混合液悬浮固体)下的敏感性研究的初步结果。后者将提供有用的信息，以确定其中一家FST的现有改装是否能够在潮湿天气条件下遵守规定，并有理由进一步考虑在其余FST实施这一做法。
The water industry and especially the wastewater treatment sector has come under steadily increasing pressure to optimize their existing and new facilities to meet their discharge limits and reduce overall cost. Gravity separation of solids, producing clarified overflow and thickened solids underflow has long been one of the principal separation processes used in treating secondary effluent. Final settling tanks (FSTs) are a central link in the treatment process and often times act as the limiting step to the maximum solids handling capacity when high throughput requirements need to be met. The Passaic Valley Sewerage Commission (PVSC) is interested in using a computational fluid dynamics (CFD) modeling approach to explore any further FST retrofit alternatives to sustain significantly higher plant influent flows, especially under wet weather conditions. In detail there is an interest in modifying and/or upgrading/optimizing the existing FSTs to handle flows in the range of 280-720 million gallons per day (MGD) (12.25-31.55 m(3)/s) in compliance with the plant's effluent discharge limits for total suspended solids (TSS). The CFD model development for this specific plant will be discussed, 2D and 3D simulation results will be presented and initial results of a sensitivity study between two FST effluent weir structure designs will be reviewed at a flow of 550 MGD (∼24 m(3)/s) and 1,800 mg/L MLSS (mixed liquor suspended solids). The latter will provide useful information in determining whether the existing retrofit of one of the FSTs would enable compliance under wet weather conditions and warrants further consideration for implementing it in the remaining FSTs.