Qualifying Criteria For Highly Efficient Water Pollution Control Equipment
|
Items Of Analysis |
Sewer |
Watercourse |
| |
Units in milligram per litre |
| 1 |
BOD (5days at 20) |
-* |
25 |
| 2 |
COD |
-* |
50 |
| 3 |
Total Suspended Solids |
-* |
25 |
| 4 |
Cyanide (as CN) |
1 |
0.05 |
| 5 |
Arsenic |
2.5 |
0.5 |
| 6 |
Phenolic Compounds
(expressed as phenol) |
0.25 |
0.1 |
| 7 |
Cadmium** |
0.5 |
0.05 |
| 8 |
Chromium** (trivalent and hexavalent) |
2.5 |
0.5 |
| 9 |
Copper** |
2.5 |
0.05 |
| 10 |
Lead** |
2.5 |
0.05 |
| 11 |
Mercury** |
0.25 |
0.025 |
| 12 |
Nickel** |
5 |
0.5 |
| 13 |
Selenium** |
5 |
0.25 |
| 14 |
Silver** |
2.5 |
0.05 |
| 15 |
Zinc** |
5 |
0.5 |
| 16 |
Metals in total** |
5 |
0.5 |
* No qualifying criteria for BOD, COD and TSS have been set for trade effluent discharged into the sewer as these pollutants would be removed at the sewage treatment works.
** The concentration of Toxic Metal shall not exceed the limits as shown, individually or in total.
NOTE: In addition to meeting the above criteria, the effluent from the.pollution control equipment must also be able to comply with the other limits stipulated in the Trade Effluent Regulations.