Division 21

United Kingdom

BAT is to reduce metal emissions from the melting furnace by using one or a combination of the following techniques:

Technique^f1	Applicability
A description of the techniques is given in Section 1.10.5.
(i) Selection of raw materials for the batch formulation with a low content of metals	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) Minimising the use of metal compounds in the batch formulation, where colouring and decolourising of glass is needed, subject to consumer glass quality requirements
(iii) Applying a filtration system (bag filter or electrostatic precipitator)	The techniques are generally applicable
(iv) Applying a dry or semi-dry scrubbing, in combination with a filtration system	The techniques are generally applicable

Table 11

BAT-AELs for metal emissions from the melting furnace in the container glass sector

Parameter	BAT-AEL^f2 ^f3 ^f4
The levels refer to the sum of metals present in the flue-gases in both solid and gaseous phases.
The lower levels are BAT-AELs when metal compounds are not intentionally used in the batch formulation.
The upper levels are associated with the use of metals for colouring or decolourising the glass, or when the flue-gases from the hot-end coating operations are treated together with the melting furnace emissions.
The conversion factor for general cases, reported in Table 2 (1,5 × 10^–3) has been applied.
In specific cases, when high quality flint glass is produced requiring higher amounts of selenium for decolourising (depending on the raw materials), higher values are reported, up to 3 mg/Nm³.
Parameter	mg/Nm³	kg/tonne melted glass^f5
Σ (As, Co, Ni, Cd, Se, Cr_VI)	< 0,2 – 1^f6	< 0,3 – 1,5 × 10^–3
Σ (As, Co, Ni, Cd, Se, Cr_VI, Sb, Pb, Cr_III, Cu, Mn, V, Sn)	< 1 – 5	< 1,5 – 7,5 × 10^–3

Annotations

f1: A description of the techniques is given in Section 1.10.5.
f2: The levels refer to the sum of metals present in the flue-gases in both solid and gaseous phases.
f3: The lower levels are BAT-AELs when metal compounds are not intentionally used in the batch formulation.
f4: The upper levels are associated with the use of metals for colouring or decolourising the glass, or when the flue-gases from the hot-end coating operations are treated together with the melting furnace emissions.
f5: The conversion factor for general cases, reported in Table 2 (1,5 × 10^–3) has been applied.
f6: In specific cases, when high quality flint glass is produced requiring higher amounts of selenium for decolourising (depending on the raw materials), higher values are reported, up to 3 mg/Nm³.