HAC高效澄清池数值模拟与挡板设置优化

Numerical Simulation of Efficient HAC Clarifier and Optimization of Baffle Installation Height

数值模拟可以获得澄清池内流场与絮凝特性的数据。分析表明,首层网格板使紊动水流迅速沿过水断面均匀分布,之后各层相同条件下的网格板对水流扰流作用几乎相同,并根据模拟结果提出合理的网格板布置方案。分析沉淀区流态与配水区上升流速,发现在合适的直壁高度与配水区高度下,澄清池流态分布与配水区平均上升流速更合理,有利于斜管装置进行泥水分离过程,可以提高出水水质,并减轻滤池处理负荷,从而优化泥渣悬浮区挡板安装高度的设计取值范围。

The data of flow field and flocculation properties of clarifier can be obtained through nu- merical simulation. The analysis showed that the first layer of grid plate enabled the quick and uniform distribution of turbulent flow along the cross section, and the grid plates had almost the same effect on the flow disturbance under the same conditions. A reasonable scheme for placing grid plates was proposed. The flow regimes in precipitation zone and rising velocity in water distribution zone were analyzed, and it was found that at appropriate height of the straight wall and water distribution zone, the flow distribution and average rising velocity of water distribution zone in the clarifier were more reasonable. It was benefi- cial for the separation of sludge and water in the inclined tube device, and could improve the effluent quality and reduce the treatment load of filter, thus optimizing the design values of baffle installation height in sludge suspension zone.