分段回流式逆流气浮工艺处理高藻水的研究

Treatment of High Algea-laden Water by Step-Recycle Counter Current Flotation

利用逆流气浮工艺处理高藻水,分别采用溶气水单段回流与分段回流的方式.结果表明,与单段回流相比,采用分段回流可以增强气泡/絮体聚合体悬浮层的拦截作用,减小悬浮层的厚度而增加过渡层的厚度,延长过渡层中小絮体与气泡的碰撞接触时间;在其它运行参数相同的情况下,单段回流时最大水力负荷达到11m/h,而分段回流时最大水力负荷可达17m/h,处理负荷提高了50%以上,处理效率大幅度增加;采用分段回流时,两释放器的回流量之比以及悬挂式释放器与原水进水口的距离对处理效果有显著影响.较为合理的布置为：固定式释放器S与原水进水口距离为180 cm,悬挂式释放器P与原水进水口的距离在60-90cm之间.P与S的流量比控制在2-3之间.

High algae-laden water was treated respectively by single-recycle and step-recycle counter current flotation. The results indicate that step-recycle mode of dissolved air water can strengthen capturing of bubbles and floes association suspension bed, and extend the collision time of smaUer floc and bubble because of reducing the thickness of suspension bed and increasing that of transition bed. Given the condition that other parameters were same, the biggest hydraulic loading of single-recycle could reach 11 m/h, and that of step-recycle could reach 17 m/h which is increased by 50 % . Efficiency of treatment was improved by a large margin. The recycle ratio of two releasers and position of the pensile releaser influenced removal effect remarkably. The distance between settled releaser and inlet of raw water is 180 era, and the range of distance between pensile releaser and inlet of raw water is 60-90 cm. The flow of pensile releaser is 2-3 times as much as settled releaser.