摘要
针对生化池连续曝气过程中氧转移率低的问题,结合污水处理中的实际情况,提出了盘式微孔曝气器脉冲式充氧方法来提高氧的转移率。通过4组不同类型的盘式微孔曝气器分别在脉冲式和连续曝气下的实验对比发现,脉冲式曝气产生的是气泡簇,对生成的气泡进行图像统计分析,得出同一区域范围内脉冲式曝气生成的气泡数量多、平均直径小。实验数据分析显示,脉冲式曝气达到氧饱和所需的时间较连续曝气方式增加了10%左右,但氧的利用率增加了50%以上,且动力效率提高了28%以上。脉冲式曝气方式大幅度提高了氧的利用率,节约能耗的同时具有更好的充氧效果,为活性污泥好氧生化处理系统工艺提供了新的研究思路。
In order to address the problem of low rate of the aeration system oxygen transfer in wastewater treatment,a new approach,fine bubble aerator,was proposed for improving the oxygen transfer rate. A group of test on fine bubble aerators was done to compare the performance of intermittent operation and continuous aeration. Compared with the continuous aeration,in intermittent aeration process,the size of bubble was reduced,the degree of turbulence in water was enhanced,and the retention time of air bubbles in water was extended.These phenomena could lead to an increasing oxygen transfer rate. The experimental results show that the bubble cluster generated by our proposed fine bubble aerator has a higher oxygen transfer rate with a bigger contact area compared with the traditional bubble aerator. Hence,it has good performance in aeration oxygenation. Although the time of intermittent oxygen saturation aeration increases about 10% than continuous aeration,oxygen utilization increases by more than 50% and power efficiency is improved by more than 28%. Therefore,our proposed approach improves the utilization of oxygen and has good aeration effects in saving energy,which could provide a new idea for the aerobic activated sludge biological treatment system.
出处
《环境工程学报》
CAS
CSCD
北大核心
2015年第9期4287-4292,共6页
Chinese Journal of Environmental Engineering
基金
浙江省重大科技专项计划项目(2012C13006-1)
关键词
微孔曝气器
脉冲式
微气泡
氧传质
fine bubble aerator
intermittent aeration
fine-bubble
oxygen transfer
