Division Emission levels associated with the best available techniques (BAT-AELs) for emissions to water

Unless otherwise stated, 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 substances per volume of water), expressed in mg/l.

The BAT-AELs expressed as concentrations refer to daily average values, i.e. 24-hour 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.

In the case of total organic carbon (TOC), chemical oxygen demand (COD), total nitrogen (TN) and total phosphorus (TP), the calculation of the average abatement efficiency referred to in these BAT conclusions (see Table 1) is based on the influent and effluent load of the waste water treatment plant.