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Table 1

Cost functions of individual treatment technologies (Sipala et al. 2003)

Treatment alternativesX < 30,000 p.e.X > 30,000 p.e.
Primary treatment Y = 0.317–9 × 10−6 × X Y = 0.132–5 × 10−7 × X 
Secondary treatment Y = 0.474–7 × 10−6 × X Y = 0.309–4 × 10−7 × X 
Filtration Y = 0.507–7 × 10−6 × X Y = 0.342–4 × 10−7 × X 
Nitrification/denitrification + filtration Y = 0.559–8 × 10−6 × X Y = 0.369–5 × 10−7 × X 
Nitrification/denitrification + phosphate removal + filtration Y = 0.602–8 × 10−6 × X Y = 0.393–5 × 10−7 × X 
Coagulation–flocculation Y = 0.939–2 × 10−5 × X Y = 0.471–5 × 10−7 × X 
Carbon adsorption Y = 1.132–1 × 10−5 × X Y = 0.730–5 × 10−7 × X 
Reverse osmosis Y = 1.503–2 × 10−5 × X Y = 0.907–5 × 10−7 × X 
Treatment alternativesX < 30,000 p.e.X > 30,000 p.e.
Primary treatment Y = 0.317–9 × 10−6 × X Y = 0.132–5 × 10−7 × X 
Secondary treatment Y = 0.474–7 × 10−6 × X Y = 0.309–4 × 10−7 × X 
Filtration Y = 0.507–7 × 10−6 × X Y = 0.342–4 × 10−7 × X 
Nitrification/denitrification + filtration Y = 0.559–8 × 10−6 × X Y = 0.369–5 × 10−7 × X 
Nitrification/denitrification + phosphate removal + filtration Y = 0.602–8 × 10−6 × X Y = 0.393–5 × 10−7 × X 
Coagulation–flocculation Y = 0.939–2 × 10−5 × X Y = 0.471–5 × 10−7 × X 
Carbon adsorption Y = 1.132–1 × 10−5 × X Y = 0.730–5 × 10−7 × X 
Reverse osmosis Y = 1.503–2 × 10−5 × X Y = 0.907–5 × 10−7 × X 

Y indicates the unit cost in €/m3.

X indicates the number of population equivalent (p.e.).

For X < 1,000 p.e., a constant cost is assumed equal to that obtained for 1,000 p.e.

For X > 200,000 p.e., a constant cost is assumed equal to that obtained for 200,000 p.e.

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