Division BAT-AELs for emissions to water

Emission levels associated with the best available techniques (BAT-AELs) for emissions to water given in these BAT conclusions refer to concentrations (mass of emitted substance per volume of water), expressed in mg/l.

Averaging periods associated with the BAT-AELs refer to either of the following two cases:

• in the case of continuous discharge, daily average values, i.e. 24-hour flow-proportional composite samples;

• in the case of batch discharge, average values over the release duration taken as flow-proportional composite samples.

Time-proportional composite samples can be used provided that sufficient flow stability is demonstrated. Alternatively, spot samples may be taken, provided that the effluent is appropriately mixed and homogeneous. Spot samples are taken if the sample is unstable with respect to the parameter to be measured. All BAT-AELs for emissions to water apply at the point where the emission leaves the plant.