Division BAT 3 In order to reduce the release of not readily biodegradable organic chelating agents such as EDTA or DTPA from peroxide bleaching, BAT is to use a combination of the techniques given below.
United Kingdom
| Technique | Applicability | |
|---|---|---|
| a | Determination of quantity of chelating agents released to the environment through periodic measurements | Not applicable for mills that do not use chelating agents |
| b | Process optimisation to reduce consumption and emission of not readily biodegradable chelating agents | Not applicable for plants that eliminate 70 % or more of EDTA/DTPA in their waste water treatment plant or process |
| c | Preferential use of biodegradable or eliminable chelating agents, gradually phasing out non-degradable products | Applicability depends on the availability of appropriate substitutes (biodegradable agents meeting e.g. brightness requirements of pulp) |