CIESC Journal ›› 2018, Vol. 69 ›› Issue (7): 3242-3248.doi: 10.11949/j.issn.0438-1157.20171511

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Numerical simulation analysis of flow characteristics of suspended packing in biological contact oxidation tank

WU Yun1,2, DU Xiaolei1,2, SONG Kai3, LIU Hongyu1,2, WANG Jie1,2, WANG Erpo4   

  1. 1 State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, Tianjin 300387, China;
    2 School of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, China;
    3 Tianjin Moor Lake Investment Development Co. Ltd., Tianjin 300381, China;
    4 Tianjin KCO Green Technology Development Co., Ltd., Tianjin 300450, China
  • Received:2017-11-12 Revised:2017-12-27 Online:2018-07-05 Published:2018-01-16
  • Supported by:

    supported by the National Natural Science Foundation of China(51678410), the China Postdoctoral Science Foundation (2015M571267), the Tianjin Science and Technology Project (16PTGCCX00070) and the Tianjin Construction Committee Science and Technology Projects(2016-19).

Abstract:

A model was developed to simulate the flow properties of suspended packing materials in the biological contact oxidation tank according to the FLUENT multi-phase flow modeling. The distribution of suspended packing materials was improved by optimizing the oxidation tank structure and aeration intensity distribution. The results indicated that the ratio of length to width and aeration intensity distribution played the key role in uniform mixing of the packing materials in the oxidation tank. The tank was divided into four subsections using separation wall, which reduced the ratio of length to width from 7.1 to 1.8. Subsequently, instead of accumulating at the end zone of the oxidation tank, the biological packing materials could be evenly distributed in four subsections. When water body flew through the overflow hole, the flow rate instantaneously increased due to the narrowing cross section area. The water body at high flow rate collided with that at low flow rate at the surrounding area, resulting in the formation of huge vortex flow field. Thus, it mixed consistently the packing materials and enhanced the dispersion effect of the materials. However, the intersection between the separation wall and side wall of the oxidation tank was subjected to the formation of dead zone. It could be resolved by redistributing the aeration intensity of the subsections. The results suggested that uneven aeration could obviously optimize the flow field, which eliminated the accumulation of the packing materials at the side wall and end zone.

Key words: biological contact oxidation pond, suspended packing, numerical simulation, aeration, multiphase flow

CLC Number: 

  • X52

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