Division 28

United Kingdom

BAT is to treat the effluent water from sinter plants where rinsing water is used or where a wet waste gas treatment system is applied, with the exception of cooling water prior to discharge by using a combination of the following techniques:

I..

heavy metal precipitation
II..

neutralisation
III..

sand filtration.

The BAT-associated emission levels, based on a qualified random sample or a 24-hour composite sample, are:

In some cases, TOC is measured instead of COD (in order to avoid HgCl₂ used in the analysis for COD). The correlation between COD and TOC should be elaborated for each sinter plant case by case. The COD/TOC ratio may vary approximately between two and four.
—	suspended solids	< 30 mg/l
—	chemical oxygen demand (COD^f1)	< 100 mg/l
—	heavy metals	< 0,1 mg/l
—	(sum of arsenic (As), cadmium (Cd), chromium (Cr), copper (Cu), mercury (Hg), nickel (Ni), lead (Pb), and zinc (Zn)).

Annotations

Footnotes

f1: In some cases, TOC is measured instead of COD (in order to avoid HgCl₂ used in the analysis for COD). The correlation between COD and TOC should be elaborated for each sinter plant case by case. The COD/TOC ratio may vary approximately between two and four.