Environmental equipments should be designed for different wastewater working conditions. However, the internal flow field in a wastewater treatment reactor is extremely complex, thus it is difficult to determine the reactor working conditions and purifying effects based on designer′s experience alone. In order to study the spatial distribution characteristics of flow field in rotating magnetic photocatalytic wastewater treatment reactors, a physical model of such a reactor is built using Gambit, and a series of numerical simulations of 3-D the flow field in it are conducted by means of Fluent, the influences of rotating speed on the liquid flow field characteristics are analyzed at three kinds of speed. The results show that the fluid flow velocity increases with the speed. The fluid flow is weaker at the speed of 0.2 rad/s; even the fluid starts to circulate adequately at the speed of 0.5 rads/s, the flow velocity is still relatively low. At 1.0 rad/s rotating speed, the fluid has a higher turbulent kinetic energy and a uniform flow distribution, but there are vortices in the flow field. An analysis of the flow field characteristics at different rotating speeds cam provide a reference for optimization design of the reactor structure.
WU Chun-Du-,ZHENG Kun-,JIE Qing-Jie- et al. Flow field simulation and analysis of rotating magnetic photocatalytic wastewater treatment reactor[J]. Journal of Drainage and Irrigation Machinery Engin, 2015, 33(3): 216-219.
Li Yunhui, Liu Xiaoqiu, Ren Min, et al. Preparation of magnetic separation light-catalysis and its application in dealing with sewerage[J]. Materials Science and Technology, 2006,14(3):326-329.(in Chinese)
Luo Wensheng, Fan Xihui. Studies on the magnetic treatment improves wastewater treatment and utilization through artificial ecological systems[J]. Chongqing Environmental Science, 1999,21(6):27-29.(in Chinese)
Zhang Lingyun, Zhang Dongxiang, Li Hansheng. Development of photocatalytic reactor in wastewater treatment[J]. Water Resources Protection, 2006,22(4):6-10.(in Chinese)
Boiarkina I, Pedron S, Patterson D A. An experimental and modelling investigation of the effect of the flow regime on the photocatalytic degradation of methylene blue on a thin film coated ultraviolet irradiated spinning disc reactor[J]. Applied Catalysis B: Environmental, 2011,110:14-24.
Qiu Z, Petera J, Weatherley L R. Biodiesel synthesis in an intensified spinning disk reactor[J]. Chemical Engineering Journal, 2012,210:597-609.
Feng Xudong, Patterson D A, Balaban M, et al. The spinning cloth disc reactor for immobilized enzymes: A new process intensification technology for enzymatic reactions[J]. Chemical Engineering Journal, 2013,221:407-417.
Sang Xuemei, Zhao Qinghua, Wang Min, et al. A novel rotating falling slurry photocatalytic reactor for degrading organic pollutants[J]. Environmental Science and Technology, 2008,31(4):107-109,115.(in Chinese)