摘要
沉淀池流体流态对沉降效果有较大影响,通过相似定理制作沉淀池物理模型,以进水挡板位置高度和进水流量为考量因子,进行清水实验与活性污泥实验。结果表明,进水挡板位置高度过低时,停留时间较长,且入流区部分产生堆积现象,影响沉淀池去除效果,进水挡板位置高度过高时,挡板导流作用不明显,流态较差,沉淀池去除率较低。低流量时,入流区产生堆积现象,影响沉降效果,高流量时,产生沿挡板向上的上升流,部分悬浮物被带到清水区,降低沉淀池去除率。在设计进水流量1.39L/min下,清水实验进水挡板位置高度为60mm时流态最佳,污泥实验进水挡板位置高度为40mm时流态最佳。
The flow pattern of sedimentation tanks has quite significant effects to the treatment efficiency.Physical model was produced according to the simulation theorem. The tracer experiment and activated sludge sedimentation experiment were carried out considering the location of baffles and inlet flux as the variable factors. The results indicated that on one hand, as the height of the baffle was too low, the settling time was longer and accumulation happened in inlet area, which affected the efficiency of sedimentation tank. On the other hand, as the height of the baffle was too high, the diversion effect of the baffle was not quite remarkable, the flow pattern was not Rood, and the removal efficiency was low： Further-more, when inlet flux was low, accumulation could be found in inlet area, which would affect the removal efficiency. While, when the inlet flux was high, the up flow could be generated and parts of suspended solids could be taken to the clean water area, decreasing the removal efficiency. In addition, when the inlet flux was 1.39L/min,. the optimum location of baffle was 60mm in the tracer experiment, and 40mm in the activated sludge sedimentation, respectively.
出处
《四川化工》
CAS
2009年第2期39-42,共4页
Sichuan Chemical Industry
关键词
平流式沉淀池
模型
流态
horizontal sedimentation tank
model
flow pattern
