Allowable Limits For Trade Effluent Discharge To Sewer/ Watercourse/ Controlled ...
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Allowable Limits For Trade Effluent Discharge To Sewer/ Watercourse/
Controlled Watercourse
Rules and Regulations
Items of Analysis Watercourse Controlled
Watercourse
(Units in milligram per litre or otherwise stated)
1 Temperature of discharge 45C 45C
2 Colour 7 Lovibond Units 7 Lovibond Units
3 pH Value 6-9 6-9
4 BOD (5 days at 20C) 50 20
5 COD 100 60
6 Total Suspended Solids 50 30
7 Total Dissolved Solids - **(2000) 1000
8 Chloride - ** (600) 250**(400)
(as chloride ion)
9 Sulphate - ** (500) 200
(as SO4)
10 Sulphide 0.2 0.2
(as sulphur)
11 Cyanide 0.1 0.1
(as CN)
12 Detergents (linear alkylate sulphonate as methylene 15 5
blue active substances)
13 Grease and Oil 10 (Total) 1 (Total)
10 (Hydrocarbons)
14 Arsenic 0.1 ** (1) 0.01 ** (0.05)
15 Barium 2 ** (5) 1 ** (5)
16 Tin - ** (10) 5
17 Iron (as Fe) 10 ** (20) 1
18 Beryllium - ** (0.5) 0.5
19 Boron 5 0.5
20 Manganese 5 0.5
21 Phenolic Compounds 0.2 Nil
(expressed as phenol)
22 *Cadmium 0.1 0.003
23 *Chromium (trivalent and hexavalent) 1 0.05
24 *Copper 0.1 0.1
25 *Lead 0.1 0.1
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Allowable Limits For Trade Effluent Discharge To Sewer/ Watercourse/ Controlled ... Page 2 of 2
Items of Analysis Watercourse Controlled
Watercourse
26 *Mercury 0.05 0.001
27 *Nickel 1 0.1
28 *Selenium 0.5 0.01
29 *Silver 0.1 0.1
30 *Zinc 1 0.5
31 *Metals in Total 1 0.5
32 Chlorine (Free) 1 1
33 Phosphate 5 2
(as PO4)
34 Calcium - ** (200) 150
(as Ca)
35 Magnesium (as Mg) - ** (200) 150
36 Nitrate - 20
(as NO3)
NOTE:
* Where 2 or more of the metals listed in the table are present in the trade effluent, the total concentration of the
metals shall not exceed 10 milligrams per litre.
**( ) Old limits before 1 May 2005. Existing industries have a grace period of 2 years to comply with new limits.
Controlled Watercourse means a watercourse from which potable water supplied by PUB under the Public
Utilities Act is obtained but does not include a watercourse from which water is pumped into a main of the PUB.
The trade effluent discharged must not include:-
(1) Calcium carbide.
(2) Petroleum spirit or other inflammable solvents.
(3) Materials that may give rise to fire or explosion hazards.
(4) Materials that may be a hazard to human life, a public nuisance, injurious to health or otherwise objectionable.
(5) Refuse, garbage, sawdust, timber, or any solid matter.
(6) Pesticides, fungicides, insecticides, herbicide, rodenticide or fumigants.
(7) Radioactive material.
The trade effluent shall be analysed in accordance with the latest edition of Standard Methods for the
Examination of Water and Wastewater published jointly by the American Water Works Association and the Water
Pollution Control Federation of the United States.
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