Division BAT 49 In order to reduce emission loads of coating colours and binders which can disturb the biological waste water treatment plant, BAT is to use technique (a) given below or, in case this is technically not feasible, technique (b) given below.

Effluents containing coating colours are collected separately. The coating chemicals are recovered by e.g.:

1. (i)

   ultrafiltration;

2. (ii)

   screening-flocculation-dewatering process with return of the pigments to the coating process. The clarified water could be reused in the process

For ultrafiltration, the applicability may be restricted when:

• effluent volumes are very small

• coating effluents are generated in various places of the mill

• many changes in coating occur; or

• different coating colour recipes are incompatible