性色AV官网永久免费,国产一区二区精品福利地址,国产一区二区美女视频,www.com黄片,亚洲精品免费在线,欧美97色伦欧美一区二区日韩,日本午夜在线观看播放,妻中蜜精品在线观看

中文 EN
Back

Business

Categories

River water purification

Concept: River water purification mainly involves removing impurities such as suspended solids, sediment, and organic matter from the river water through corresponding filtering materials and equipment, in order to meet domestic water standards.

General process: River water purification generally adopts methods such as flocculation sedimentation, quartz sand filter, precision filter, and disinfection treatment to ensure the cleanliness and safety of the river water.


Related cases

img