Table 1 Water use indicators.

From: The construction of mine water recycling performance evaluation index system under the Internet of Things environment

Water use

Sewage discharge standard

Mining cooling

Fully mechanized mining face emulsion

Ventilation and dustproof

Standard status

COD value ≤ 100 mg/L

SS value (suspended solids content) does not exceed 20 mg/L

pure water

SS (suspended solids content) does not exceed 30 mg/L

The suspended solid (SS) content does not exceed 70 mg/L

pH 7–9

The chromaticity of water quality is less than or equal to 5 degrees

Suspended matter ≤ 0.12 mm

pH 6–9

Free Cl content 0.5–1.0 mg/L

Turbidity ≤ 1 mg/L

pH 6–9

Ammonia nitrogen content ≤ 15 mg/L

Nothing is visible to the naked eye

pH 7–9

Conductivity ≤ 30 µs/cm

COD ≤ 1 mg/L

Hardness < 0.3 moL/L

Nitride ≤ 6 mg/L

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