Analysis of hydraulic modes of operation of the divergent plates block of the flotation-sedimentation tank

Hydraulics

Ksenofontov, B.^1 ; Senik, E.^1 ; Ivanov, M.^1

Bauman Moscow State Technical University, 5 Second Baumanskaya Street, Moscow

105005, Russia^1

关键词: Computer modeling;    Flotation- sedimentation tanks;    Hydraulic characteristic;    Modes of operation;    Multiphase model;    Operating modes;    Thin layers;    Velocity gradients;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/492/1/012024/pdf
DOI  :  10.1088/1757-899X/492/1/012024

来源: IOP

【 摘 要 】

This article shows the results of hydraulic characteristics analysis of operating modes of divergent plates of the thin-layer clarification block of the flotation-sedimentation tank for wastewater treatment. A method for calculating the velocity gradient and the geometric parameters of the block of divergent plates is proposed and tested by a computer modeling in this article, and besides the distance between the plates varies from 12.5 mm to 141 mm. The particles are assumed to be spherical in shape; its modeling is carried out by using the Lagrangian multiphase model. By the results of modeling it has been discovered, that with the set parameters of the plates block, the time for particles to reach the highest point of the sedimentation trajectory is 140 seconds. Moreover, the plate length, required for particles sedimentation, turns out to be 590 mm. Whereas the sedimentation time and the plate length, calculated by the suggested method, are almost the same with the results acquired by modeling. In connection with that the suggested formulas appliance becomes possible for calculation of the sedimentation time and the plate length.