EN5(1) Total Water Use (Including Discharges)
| Calendar Year | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 |
| Sulphate (tonnes) | 341 | 4 | 9.5 | 16.9 | 1.7 | 19.1 |
| Sanitary effluent ('000's m 3 ) | 124 | 104 | 109 | 97.5 | 97.5 | 88.3 |
Typically from late May through mid-December, marine-sourced cooling water used at the Burrard Generating Station is chlorinated to reduce biofouling in the cooling system from mussel larva. Before the chlorinated water is discharged, it is treated with sulphur dioxide at the rate of 20 to 50 micrograms per litre to remove the residual chlorine that can be harmful to aquatic life. The treated discharge contains primarily sulphate and chloride as the products of the dechlorination reaction. Because the sulphate concentration in Burrard Inlet is approximately three per cent by weight, the additional sulphate discharged does not change the local concentration detectably.
Last Modified: Jul 11, 2007
