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Table 1 Standards of pollutants in effluent treated waters based on EPO (2015)

From: Impact assessment of treating wastewater on the physiochemical variables of environment: a case of Kermanshah wastewater treatment plant in Iran

No.

Variable

Effluent to surface water

Effluent to groundwater

Use in agriculture and irrigation

1

TSS (mg/l)

40

2

Temp. (°C)

3

Alkal. (ppm)

4

pH

6.5–8.5

5–9

6–8.5

5

NO3 (mg/l)

50

10

6

P (mg/l)

6

6

7

BOD (mg/l)

30

30

100

8

COD (mg/l)

60

60

100

9

DO (mg/l)

2

2