pretreat water with a coagulant before filtering
过滤前用凝结剂预先处理水

Xylanase Pretreat for Improving the Bleachability and Brightness of Wheat Straw CMP
木聚糖酶预处理提高麦草化机浆可漂性及白度的研究

An aerated biological filter was used to pretreat the alkaline wastewater in refinery.
采用曝气生物滤池氧化工艺对炼油厂碱水进行预处理。

The techniques to pretreat ventilation networks for analyzing it and the software of mine ventilation networks solution are presented in this paper.
介绍了矿井通风网络分析前处理技巧以及解算软件。