Division 30
United Kingdom
When selenium compounds are used for colouring the glass, BAT is to reduce selenium emissions from the melting furnace by using one or a combination of the following techniques:
| A description of the techniques is given in Section 1.10.5. | |
| Techniquef1 | Applicability |
|---|---|
| (i) Minimising the evaporation of selenium from the batch composition by selecting raw materials with a higher retention efficiency in the glass and reduced volatilisation | The applicability may be limited by the constraints imposed by the type of glass produced at the installation and the availability of the raw materials |
| (ii) Applying a filtration system | The technique is generally applicable |
| (iii) Applying a dry or semi-dry scrubbing, in combination with a filtration system | |
Table 20
BAT-AELs for selenium emissions from the melting furnace in the flat glass sector for the production of coloured glass
| The values refer to the sum of selenium present in the flue-gases in both solid and gaseous phases. | ||
| The lower levels correspond to conditions where the reduction of Se emissions is a priority over a lower production of solid waste from filter dust. In this case, a high stoichiometric ratio (reagent/pollutant) is applied and a significant solid waste stream is generated. | ||
| The conversion factor reported in Table 2 (2,5 × 10–3) has been applied. | ||
| Parameter | BAT-AELf2 f3 | |
|---|---|---|
| mg/Nm3 | kg/tonne melted glassf4 | |
| Selenium compounds, expressed as Se | 1 – 3 | 2,5 – 7,5 × 10–3 |
Annotations
Footnotes
- f1
-
A description of the techniques is given in Section 1.10.5.
- f2
-
The values refer to the sum of selenium present in the flue-gases in both solid and gaseous phases.
- f3
-
The lower levels correspond to conditions where the reduction of Se emissions is a priority over a lower production of solid waste from filter dust. In this case, a high stoichiometric ratio (reagent/pollutant) is applied and a significant solid waste stream is generated.
- f4
-
The conversion factor reported in Table 2 (2,5 × 10–3) has been applied.