Division 24
United Kingdom
In order to reduce the amount of chromium in sludge sent for disposal, BAT is to use one or a combination of the techniques given below.
| Technique | Description | Applicability | |
|---|---|---|---|
| a | Recovery of chromium for reuse in the tannery | Re-solution of the chromium precipitated from the tanning float, using sulphuric acid for use as a partial substitute for fresh chromium salts. | Applicability is restricted by the need to produce leather properties which meet customers specification, in particular related to dyeing (reduced fastness and less brightness of colours) and fogging. |
| b | Recovery of chromium for reuse in another industry | Use of the chromium sludge as a raw material by another industry. | Applies only where an industrial user for the recovered waste can be found. |