Data description

Data description

Emissions to water

Water that is taken in has to be treated before it is used in the process, and it is again treated after the process before it is released as effluent to a recipient. The substances in the effluent after wastewater treatment are reported.

All mills have some sort of effluent water treatment, either mechanical treatment by sedimentation or in addition biological anaerobic and aerobic or chemical treatment of the effluent.

A few mills send their effluent water to an external communal treatment plant.
The volume of effluent water is reported separately for treated process water and thermally polluted effluent (e.g. cooling water). All mills have reported the figures for outgoing effluent water to the recipient i.e. effluent water after final treatment.

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Allocation of emissions to paper grades when a mill produces more than one paper grade

As far as waterborne emissions per m3 are measured for a mill, these data are well documented.

The figures reported are usually based on continuous measurements according to control programmes set by official authorities. Given emissions to water are measured according to standard methodology.

Where necessary, allocation between paper grades is done according to mass of produced paper grade. There is no technical reason for differences in water consumption, effluent and emissions to water between Testliner and Recycled Fluting. However, the weighted averages for each paper grade do show differences because different mills are included in the samples. To prevent misunderstanding, the same amounts for water use, effluent and emissions to water for both paper grades are reported as their weighted average. 

The water used for the production of White Top Testliner is relatively higher than for Testliner and Recycled Fluting. No separate data are reported as the effluent from its production is mixed with that from the production of other grades produced on site.

Data on emissions to water from the corrugated plants were also collected. However, the corrugated plants are not subject to Industrial Emissions legislation, and therefore the quantity and quality of available data is inconsistent. This is further complicated by the fact that the corrugated plants do not all have their own effluent treatment facilities or treat only certain aspects of the waste water associated with specific processes (for example, ink recovery). Many plants discharge a proportion of their wastewater under specific agreement to public effluent treatment facilities and therefore do not have access to data on the releases to the environment (after final treatment). It did not prove possible to make a reliable analysis with the data collected during the latest survey. For this reason, data representative of emissions after a public waste water treatment plant were considered for the waste emissions from the corrugated plant.