Division 13

United Kingdom

BAT is to reduce the emission load of pollutants in the waste water discharges by using one or a combination of the following waste water treatment systems:

Technique	Applicability
(i) Standard pollution control techniques, such as settlement, screening, skimming, neutralisation, filtration, aeration, precipitation, coagulation and flocculation, etc. Standard good practice techniques to control emissions from storage of liquid raw materials and intermediates, such as containments, inspection/testing of tanks, overfill protection, etc.	The techniques are generally applicable
(ii) Biological treatment systems, such as activated sludge, biofiltration to remove/degrade the organic compounds	The applicability is limited to the sectors which use organic substances in the production process (e.g. continuous filament glass fibre and mineral wool sectors)
(iii) Discharge to municipal waste water treatment Plants	Applicable to installations where further reduction of pollutants is necessary
(iv) External reuse of waste waters	The applicability is generally limited to the frits sector (possible reuse in the ceramic industry)

Table 5

BAT-AELs for waste water discharges to surface waters from the manufacture of glass

Parameter^f1	Unit	BAT-AEL^f2(composite sample)
The relevance of the pollutants listed in the table depends on the sector of the glass industry and on the different activities carried out at the plant.
The levels refer to a composite sample taken over a time period of 2 hours or 24 hours.
For the continuous filament glass fibre sector, BAT-AEL is < 200 mg/l.
The level refers to treated water coming from activities involving acid polishing.
In general, total hydrocarbons are composed of mineral oils.
The higher level of the range is associated with downstream processes for the production of lead crystal glass.
pH	—	6,5 – 9
Total suspended solids	mg/l	< 30
Chemical oxygen demand (COD)	mg/l	< 5 – 130^f3
Sulphates, expressed as SO₄ ^2–	mg/l	< 1 000
Fluorides, expressed as F^–	mg/l	< 6^f4
Total hydrocarbons	mg/l	< 15^f5
Lead, expressed as Pb	mg/l	< 0,05 – 0,3^f6
Antimony, expressed as Sb	mg/l	< 0,5
Arsenic, expressed as As	mg/l	< 0,3
Barium, expressed as Ba	mg/l	< 3,0
Zinc, expressed as Zn	mg/l	< 0,5
Copper, expressed as Cu	mg/l	< 0,3
Chromium, expressed as Cr	mg/l	< 0,3
Cadmium, expressed as Cd	mg/l	< 0,05
Tin, expressed as Sn	mg/l	< 0,5
Nickel, expressed as Ni	mg/l	< 0,5
Ammonia, expressed as NH₄	mg/l	< 10
Boron, expressed as B	mg/l	< 1 – 3
Phenol	mg/l	< 1

Annotations

Footnotes

f1: The relevance of the pollutants listed in the table depends on the sector of the glass industry and on the different activities carried out at the plant.
f2: The levels refer to a composite sample taken over a time period of 2 hours or 24 hours.
f3: For the continuous filament glass fibre sector, BAT-AEL is < 200 mg/l.
f4: The level refers to treated water coming from activities involving acid polishing.
f5: In general, total hydrocarbons are composed of mineral oils.
f6: The higher level of the range is associated with downstream processes for the production of lead crystal glass.