Mixing effect in sewage treatment pool by distribution of submersible mixers
TIAN Fei, SHI Wei-Dong, LU Xi-Ning, CHEN Bin, OU Ming-Xiong
(1.School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 3.National Research Center of Pumps, Zhenjiang, Jiangsu 212013, China)
To study mixing effect in sewage treatment pool by distribution of submersible mixers, with a 3D model built through Pro/E software and an unstructured tetrahedron grid of sewage treatment pool built through ICEM software, on the platform of computational fluid dynamics software Fluent 6.3, applying dynamic coordinate system technology, RNG k-ε turbulent model and PIOS algorithm, a numerical simulation of sewage treatment pool with submersible mixers was conduced. The global fluid field and every section velocity flow field distribution were analyzed. The efficiency of each submersible mixer was observed. The average fluid velocity and mixing area in the sewage pool were studied at the same time. The results show that in the optimal project H, the speed of three submersible mixers is 1 200 r/min, and their stagger angles are 45°, 30°, 30°, respectively, with the fluid mixing area in the pool reaching more than 90%. Under the operation of three mixers, the fluid in the sewage pool forms a continuous circulating water flow,with the fluid being adequately mixed and the average fluid velocity at around 0.3 m/s, satisfying the mixer′s work requirements. This method can provide a reference basis for practical engineering application of submersible mixers.
Yan Jianhua, Huang Daojian, Teng Guorong. Research on rural domestic sewage disposal of biologic disposal high efficiency blender[J]. Journal of Anhui Agricultural Science, 2009, 37 (20): 9606-9607. (in Chinese)
Wang Qingchao, Zhang Jianzhong. Nonlinear predictive control for continuous stirredtank reactor using hammerstein model[J]. Journal of Nanjing University of Science and Technology: Natural Science, 2010, 34(5):618-623.(in Chinese)
Tian Fei, Shi Weidong, Chen Bin. Simulation of thrust of sewagetreatment mixer mixing different fluid[C]／／Proceedings of the Third International Conference on Modelling and Simulation. England: World Academic Press, 2010:135-138.