Dpto. Ingeniería Térmica y de Fluidos, Universidad Politécnica de Cartagena, Doctor Fleming s/n, 30202 Cartagena, Spain.
Dpto. Ingeniería Térmica y de Fluidos, Universidad Politécnica de Cartagena, Doctor Fleming s/n, 30202 Cartagena, Spain.
Water Res. 2015 Mar 15;71:282-93. doi: 10.1016/j.watres.2014.11.053. Epub 2014 Dec 9.
Continuous stirred tank reactors (CSTR) are widely used in wastewater treatment plants to reduce the organic matter and microorganism present in sludge by anaerobic digestion. The present study carries out a numerical analysis of the fluid dynamic behaviour of a CSTR in order to optimize the process energetically. The characterization of the sludge flow inside the digester tank, the residence time distribution and the active volume of the reactor under different criteria are determined. The effects of design and power of the mixing system on the active volume of the CSTR are analyzed. The numerical model is solved under non-steady conditions by examining the evolution of the flow during the stop and restart of the mixing system. An intermittent regime of the mixing system, which kept the active volume between 94% and 99%, is achieved. The results obtained can lead to the eventual energy optimization of the mixing system of the CSTR.
连续搅拌槽式反应器（CSTR）广泛应用于污水处理厂，通过厌氧消化来减少污泥中的有机物和微生物。本研究对 CSTR 的流体动力学行为进行数值分析，以实现节能优化。确定了不同标准下消化罐内污泥流动特性、停留时间分布和反应器有效体积。分析了搅拌系统的设计和功率对 CSTR 有效体积的影响。通过检查搅拌系统停止和重新启动过程中的流动演变，在非稳态条件下求解数值模型。实现了搅拌系统的间歇运行模式，使有效体积保持在 94%至 99%之间。所获得的结果可以实现 CSTR 搅拌系统的最终节能优化。
