直接过滤 meaning in English

direct filtration

Study on micro - flocculation direct filtration process in domestic sewage
微絮凝直接过滤工艺处理生活污水的实验研究
Research result shows that : ( 1 ) in the micro - flocculation joint direct filtration process , fecl3is a suitable coagulant , but pac is not
试验结果表明： ( 1 )微絮凝?直接过滤中，以fecl _ 3作为混凝剂时，滤池的过滤特性良好， pac不适合作为混凝剂。
( 2 ) feclsused as a coagulant when the water quality after filtration has tiny difference in the direct filtration process , compared with the finer sand media , the velocity increase of the water head loss of the coarser sand media is slower , and its filtration cycle is longer
( 2 )在直接过滤过程中，采用fecl _ 3作为混凝剂、出水浊度保持基本相同时，粗滤料的水头损失增长速度较慢，过滤周期比较长。 ( 3 )