上向流 meaning in Chinese

upward flow

Hydrolysis acidification and upward flow aerated biological filter technology of wastewater treatment
上向流曝气生物滤池工艺处理小城镇污水
This study tries to use upflow rough filtration as the pretreatment for slow sand filtration
摘要尝试采用上向流粗滤，作为慢滤池的预处理。
Both results of the experiment and simulation show upflow rough filtration holds the characteristics of simple operation , easy maintenance and stable performance
试验及模拟结果均表明：此上向流粗滤操作维护简单，运行稳定。