摘要
曝气生物滤池(BAF)是近年来发展的一种新型污水处理技术,它具有工艺简单、占地节省、有机负荷与水力负荷高、投资较少等优点,特别适用于我国资金短缺的中小城镇分散型污水的处理。文章采用数值模拟与实验分析的方法研究前人较少涉及的BAF中气液两相流的相关规律,揭示流场形态与溶解氧的关系,并分析对反应器处理效能的影响。实验结果表明,纵横比、气体流速、曝气孔径三种因素均能改变流场形态,并且单位体积内气泡数量多、漩涡结构发展充分、气液两相混合充分的流场能使得污水处理效率得到提升。
Biological aerated filter （BAF） as a new wastewater treatment technique is easy operated and cost effective, which can be used for separated sewage treatment in small towns in China. Particle image velocimetry technique was used to study gas-liquid two-phase flows. Taking bubble velocity as a boundary condition, gas-liquid two-phase flow velocity field of different conditions obtained. The most effective aeration pattern was proposed. With the change of diameters of capillary tubes, bubble velocity and ratio of aeration tank, bubble volume and distribution of gas phase changed simultaneously.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2010年第1期27-30,共4页
Environmental Science & Technology
基金
国家自然科学基金资助(50679071)
博士后科学基金资助(20070410378)
关键词
曝气生物滤池
气液两相流
流场
数值模拟
biological aerated filter （BAF）
gas-liquid two-phase flow
experimental research
numerical simulation
