3.3.12           Weighting category Nutrification

The entry of mostly inorganic (often nitrogen- or phosphorus -) compounds into the environment by industrial waste water or gaseous emissions of, e.g., nitrogen oxides, can lead to an disturbance of the biological equilibrium, which causes the nutrification of waters, and this has to be avoided. The nutrification potential (NP) of substances is expressed in relation to the nutrification potential of phosphate (PO4), which potential is defined by the value 1. In EATOS, this value 1 the highest weighting factor Q = 10 is assigned to, and the remaining weighting factors Q equally spaced ranges up to 0.2 for Q = 1 are assigned to. Q is determined from the nutrification potential following the expression: Q = [NP × 10]. The assignment is presented in Table 15.

 

Table 15  Assignment of nutrification potentials (NP) to the weighting factor QNutrficaition

Q

 

NP [PO4 := 1]

 

1

<

 

0.2

2

0.2

to

0.3

3

0.3

to

0.4

4

0.4

to

0.5

5

0.5

to

0.6

6

0.6

to

0.7

7

0.7

to

0.8

8

0.8

to

0.9

9

0.9

to

1

10

1

 

<

           

 

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