LI Wen-tao,ZHAN Lu-meng,LI Meng-kai,et al.Impact of Perforated Plate on UV Disinfection Reactor Performance as Evaluated with CFD Modeling[J].China Water & Wastewater,2021,37(19 19):40-46.
Impact of Perforated Plate on UV Disinfection Reactor Performance as Evaluated with CFD Modeling
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
19 19
Page:
40-46
Column:
Date of publication:
2021-10-01
- Keywords:
- perforated plate; UV disinfection; flow pattern; disinfection efficiency; computational fluid dynamics (CFD)
- Abstract:
- The effect of the perforated plate on the flow pattern and disinfection efficiency of a three-lamp annular UV disinfection reactor was evaluated by using computational fluid dynamics (CFD) modeling. The implementation of a perforated plate in the front of the conventional UV disinfection reactor could obviously change the concentration of the original water flow. However, the addition of a perforated plate in the middle of the sterilizer had limited effect on further homogenizing the velocity distribution. As the UV intensity had the maximum value around the lamps with a triangular arrangement, the appropriate dispersion of the water flow increased the matching degree between the water flow and radiation, thus improving the disinfection performance. In the designed flow range, the effective UV dose of the reactor with a small-pore perforated plate (aperture of 6 mm) increased by 20%-34%, which was 3%-13% higher than that of the basic perforated plate (aperture of 10 mm) with better water distribution, indicating that a too uniform velocity distribution under the existing differential light intensity distribution could reduce the disinfection efficiency. The variation of the water UV transmittance did not affect the comparative performances of different types of UV disinfection reactor. However, a high transmittance was more conducive to the improvement of the disinfection performance. Under different perforated deflector conditions, the performance of the UV disinfection reactor mainly depends on its minimum UV dose rather than the average UV dose. Therefore, the configuration optimization and operation evaluation of the UV disinfection reactor based on CFD simulation technology is an important way to improve and ensure the efficiency of the UV disinfection.
Last Update:
2021-10-01