摘要
污水处理好氧工艺中广泛采用柔性孔曝气调控水体溶氧量,降低微泡尺寸有助于提高水体氧利用率及微生物活性,强化好氧工艺处理效率。常规连续供气转换为脉冲供气可显著降低成泡尺寸,然而脉冲流态下柔性孔成泡机制尚不清楚。以脉冲气流-柔性孔成泡为研究对象,通过力学分析和光学观测结合分析了脉冲气流对柔性孔成泡过程的影响。研究结果表明,脉冲气流一方面强化气泡脱附动量力,同时引发柔性膜高频低幅振荡,促进了气泡提前脱附,另一方面抑制了气泡脱附后的纵向兼并,二者共同导致气泡尺寸降低。研究结果可为污水处理好氧工艺过程强化提供新的技术思路。
Flexible-hole aeration is widely used in the aerobic process of sewage treatment to control the amount of dissolved oxygen in the water body.Reducing the size of microbubbles can help improving the oxygen utilization rate and microbial activity of the water body,and enhancing the efficiency of the aerobic process.Converting continuous gas supply to pulsed gas supply can significantly reduce the bubble size.However,the bubble formation mechanism of flexible-holes under pulsed flow regime is still unclear.This paper takes the pulsed air flow-flexible hole coupled bubble formation as the research object.Through a combination of mechanical analysis and optical observation,the impact of pulsed air flow on the flexible-hole bubble formation process was analyzed.The research results show that the pulse air flow strengthens the momentum force of bubble desorption,and at the same time triggers high-frequency and low-amplitude oscillations of the flexible membrane,which promotes early desorption of bubbles.Besides,pulsed air flow inhibited the vertical coalescence of bubbles,which together led to the reduction of bubble size.
作者
李超
陈浩文
胡真
王成行
吕昊子
邱显扬
LI Chao;CHEN Haowen;HU Zhen;WANG Chenghang;LYU Haozi;QIU Xianyang(Institute of Resources Utilization and Rare Earth Development,Guangdong Academy of Sciences,Guangzhou 510650,Guangdong,China;State Key Laboratory of Rare Metals Separation and Comprehensive Utilization,Institute of Resources Utilization and Rare Earth Development,Guangdong Academy of Sciences,Guangzhou 510650,Guangdong,China;School of Chemical Engineering,Zhengzhou University,Zhengzhou 450001,Henan,China;Zhongyuan Critical Metals Laboratory,Zhengzhou University,Zhengzhou 450001,Henan,China)
出处
《化工学报》
EI
CSCD
北大核心
2024年第12期4761-4769,共9页
CIESC Journal
基金
稀有金属分离与综合利用国家重点实验室开放基金项目(GK-202301)
广东省矿产资源开发和综合利用重点实验室开放基金项目(GDKT-202301)
中原关键金属实验室项目(GJJSGFYQ202327)
河南省科技攻关项目(242102321176)。
关键词
脉冲气流
柔性孔
气泡
动量力
膜振荡
oscillatory airflow
flexible orifices
bubbles
momentum force
membrane oscillation
作者简介
通信作者:邱显扬(1957-),男,研究员,qxyysy@163.com;第一作者:李超(1987-),男,博士,副教授,c.li@zzu.edu.cn。
