XU Xiao-yi,GE Dan-dan,YU Lan,et al.Analysis of Fine Grit Separation Characteristics in a Vortex-type Grit Chamber Based on Regression Orthogonal Design[J].China Water & Wastewater,2021,37(11 11):63-69.
Analysis of Fine Grit Separation Characteristics in a Vortex-type Grit Chamber Based on Regression Orthogonal Design
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
11 11
Page:
63-69
Column:
Date of publication:
2021-06-01
- Abstract:
- Particle size characteristic of suspended particles is one of the important factors affecting the design and operation efficiency of a vortex-type grit chamber. The particle size of inorganic substances in urban sewage in China is very small, so it is inappropriate to use the conventional parameters to design or operate a grit chamber directly. According to the distribution characteristics of inorganic suspended solid (ISS) in urban sewage, a Pista vortex-type grit chamber model was established, and separation characteristics of fine grit in the vortex-type grit chamber were simulated by means of regression orthogonal design. Based on different particle size range of the suspended particles (0-100 μm, 100-200 μm and >200 μm), a multivariate regression model between ISS removal efficiency and influencing factors was developed, and the influence rule of each factor on particle removal efficiency and the optimal conditions were determined. Rotation speed and hydraulic residence time (HRT) were different in the optimal conditions for ISS removal in various particle size ranges. Although the increase of HRT and rotation speed could improve the separation and removal efficiency of the fine inorganic particles to a certain extent, it had a poor effect on the removal efficiency of particles with particle size less than 100 μm. Under the optimal operation conditions, the error between the actual physical model results and the regression prediction was 1.86%-4.20%, which had good reliability.
Last Update:
2021-06-01