| 摘要 |
Wastewater, particularly from a recycle gas-scrubbing and gas-cooling system of a blast furnace, is treated in a two-stage chlorination unit, the first stage including a chlorine addition at a pH of 8.5 to 10, and the second stage continuing the chlorination reaction at a pH of 6 to 8. The oxidation-reduction potential in the second stage is used to control the chlorine addition to the first stage. Various contaminants, notably nitrogen-containing compounds, are destroyed in the chlorination steps. After chlorination, the process stream is preferably passed through activated carbon to remove organics. |
