多菌群生物污水处理反应器中流体的液面速度分布的影响

多菌群生物污水处理反应器中流体的液面速度分布的影响(中文5000字,英文3000字)
摘要：多菌群生物污水处理反应器的主反应区的流体液面速度分布的流动特性和影响是使用干净水源进行研究的。实验结果表明，主反应区的液体在垂直平面上形成了非对称循环流，循环流在穿孔曝气管气泡的起重作用下，在中心区域的流速较低而在外围区域的流速较高。随着液位从525mm变化到55mm，中心区域的液位和较低的流速在主反应区变化并不明显。随着液面高度的降低，主反应区水循环的范围减小，但是流速梯度从中心向两边逐渐增加并且水平方向上的速度分布出现更加明显的不对称性。对于多菌群生物污水处理反应器的设计和操作来说，列出的结果具有重要的指导性意义。
关键词：多菌群生物污水处理反应器；流动特性；速度分布；液位

Effects of liquid level on velocity distribution of fluid

Abstract—The flow characteristics and effects of liquid level on velocity distribution of the fluid in main reaction zone of multiflora biological wastewater treatment reactor were studied with clean water. Experimental results demonstrated that the fluid in main reaction zone formed non-symmetrical cycle flow in the vertical plane with lower flow velocity in the central area and higher flow velocity in the peripheral area under the lifting action of the bubbles from perforated aerated pipe. As the liquid level varied from h=525 mm to h = 55 mm, the position and the flow rate of the central zone with lower velocity in the main reaction zone had not changed distinctly; With the decrease of liquid level height, the scope of water circulation decreased in the main reaction zone, but the velocity gradient from the center to the left and right increased gradually, and velocity distribution in the horizontal direction appeared the more obvious nonsymmetry. For the design and operation of multi-flora biological wastewater treatment reactor, the results had important guiding significances that were listed out.