Three-level difference of secondary drainage in coal mine

The difference between use and standard.

1, secondary drainage generally refers to the main drainage system in coal mines, which is used to remove underground water and rainwater, while tertiary drainage refers to further treatment of secondary drainage to achieve higher water quality standards.

2. The secondary drainage is drained by underground pumps, pipelines and other equipment, while the tertiary drainage requires that the water quality meet the national or local discharge standards and be directly discharged into natural water bodies or used for agricultural irrigation.