Table 2 Optimal range (mg/liter) of water consumption indicators in industries.

From: Investigating the improvement of the quality of industrial effluents for reuse with added processes: coagulation, flocculation, multi-layer filter and UV

Variable

First group

The second group

The third group

The fourth group

Fe (mg/L)

0–0.05

0–0.1

0–0.3

0–1

Mn (mg/L)

0–0.01

0–0.05

0–0.3

0–1

pH

7–9

6–10

5–10

5–10

COD (mg/L)

0–5

0–10

0–20

0–75

Hardship (mg/L)

0–1

0–100

0–250

0–500

Alkalinity (mg/L)

0–50

0–75

0–150

0–500

Sulphate (mg/L)

0–20

0–100

0–250

0–500

Silica (mg/L)

0–5

0–10

0–20

0–50

Turbidity (NTU)

0–1

0–5

0–10

0–100

TDS (mg/L)

0–50

0–100

0–500

0–1000

Cl− (mg/L)

0–20

0–100

0–200

0–500

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