Fluid dynamic analysis of a continuous stirred tank reactor for technical optimization of wastewater digestion
Fluid dynamic analysis of a continuous stirred tank reactor for technical optimization of wastewater digestion
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DOI：
10.1016/j.watres.2014.11.053
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发表时间：
2015-03-15
期刊：
影响因子：
12.8
通讯作者：
Zamora, B.
中科院分区：
文献类型：
--
作者：
Hurtado, F. J.;Kaiser, A. S.;Zamora, B.
连续搅拌釜式反应器(CSTR)被广泛应用于污水处理厂，通过厌氧消化来降低污泥中的有机物和微生物。本研究对CSTR的流体力学行为进行了数值分析，以期对该过程进行能量优化。测定了不同条件下消化池内的污泥流动特性、停留时间分布和活性体积。分析了混合系统的设计和功率对CSTR活性体积的影响。在非定常条件下，通过考察混合系统停止和重新启动过程中的流动演变，对数值模型进行求解。实现了混合系统的间歇状态，使活性体积保持在94%~99%之间。所得结果可用于CSTR混合系统的最终能量优化。(C)2014爱思唯尔有限公司。保留所有权利。
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. (C) 2014 Elsevier Ltd. All rights reserved.