1.

Colour and Odour

All effort should be made to remove colour and unpleasant odour as far as practicable

-

25

All effort should be made to remove colour and unpleasant odour as for as practicable.

2.

Suspended Solids, mg/l, max

100

600

200

•  For process wastewater

•  For Cooling water effluent 10% above total suspended matter of influent

3.

Particle size of suspended solids

Shall pass 850 micron IS Sieve

-

-

•  Floatable solids max. 3 mm

•  Settleable solids max. 856 micron

4.

pH value

5.5 to 9.0

5.5 to 9.0

5.5 to 9.0

5.5 to 9.0

5.

Temperature

Shall not exceed 5 0 C above the receiving water temperature

Shall not exceed 5 0 C above the receiving water temperature

6.

Oil and grease mg/l max.

10

20

10

20

7.

Total residual chlorine mg/l max.

1.0

-

-

1.0

8.

Ammonical nitrogen (as N), mg/l max

50

50

-

50

9.

Total Kjeldahl nitrogen (as N), mg/l max

100

-

-

100

10.

Free Ammonia (as NH3), mg/l max

5.0

-

-

5.0

11.

Biochemical oxygen demand (3 days at 27 0 C), mg/l max.

30

350

100

100

12.

Chemical Oxygen demand, mg/l max.

250

-

-

250

13.

Arsenic (as As), mg/l, Max

0.2

0.2

0.2

0.2

14.

Mercury (as Hg), mg/l, Max

0.01

0.01

-

0.01

15.

Lead (as Pb), mg/l, Max

0.1

1.0

-

2.0

16.

Cadmium (as Cd), mg/l, Max

2.0

1.0

-

2.0

17.

Hexavalent chromium (as Cr+6) mg/l, max.

0.1

2.0

-

1.0

18.

Total Chromium (as Cr.) mg/l, max.

2.0

2.0

-

2.0

19.

Copper (as Cu) mg/l, Max

3.0

3.0

-

3.0

20.

Zinc (as Zn) mg/l, Max

5.0

15

-

15

21.

Selenium (as Se), mg/l, Max

0.05

0.05

-

0.05

22.

Nickel (as N) mg/l max.

3.0

3.0

-

5.0

23.

Cyanide (as CN), mg/l, Max

0.2

2.0

0.2

0.2

24.

Fluoride (as F) mg/l, Max

2.0

15

-

15

25.

Dissolved Phosphates (as P), mg/l, max.

5.0

-

-

-

26.

Sulphide (as S), mg/l max.

2.0

-

-

5.0

27.

Phenolic compounds (as C 6 H 5 OH) mg/l, max

1.0

5.0

-

5.0

28.

Radioactive materials:

•  Alpha emitters micro curie mq/l, max.

•  Beta emitters micro curie mg/l, Max

10 -7

10 -6

10 -7

10 -6

10 -8

10 -7

10 -7

10 -6