基于寒区湖库水源斜板沉淀池流态的数值模拟研究

Numerical Simulation of Flow Pattern in Lamellar-type Settler Based on Reservoir Source Water in Cold Areas

在寒区高色、低浊水库型水源水处理中,沉淀过程是控制出水水质指标、降低消毒副产物风险的核心环节,当采用斜板沉淀池且其长度过大时会出现负荷不均、出水絮体流失等问题。通过试验研究并利用Fluent软件进行水力模拟,提出末端集水的沉淀方式,确定了斜板沉淀池集水堰布置的方式和堰负荷控制方法,并模拟了不同集水方式下池内的流态变化。研究还发现,当斜板沉淀池较长时,清水区存在推流作用,可以通过集水堰负荷的调整、前端板间距的控制等方法优化水力流态达到最佳沉淀路径。

The sedimentation process is key to controlling water indicators and reducing disinfec- tion by-products risk in the treatment of high color and low turbidity reservoir source water in cold areas. If the lamellar-type settler is too long, the sedimentation load is different in each location and the flocs are prone to loss. By experiment and hydraulic simulation with Fluent software, a way of end catchment was proposed, methods of catchment weir arrangement and load control were determined, and the changes of flow pattern in different catchment ways were simulated. Plug flow existed in the clear water zone of the long lameliar-type settler. The hydraulic flow pattern could be optimized by adjusting the catchment weir load and reducing the front plate spacing, which achieves optimal sedimentation.