A Feasibility Study - Aaltodoc - Aalto-yliopisto

Cost of water (€/m³)
5
4,5
4
3,5
3
2,5
2
1,5
1
0,5
0
Figure 45. Cost of water (€/m³) on Site 2.
At the nominal pump capacity of 0,03 m³/s, there are 8 pressure vessels and 56 RO
membranes, with a nominal output of 1400 m³/day. The cost breakdown of Site 2 at a
nominal pump capacity of 0,03 m³/s is presented in Table 7.
9.6 Site 3
Cost of Water (€/m3)
Load factor (%)
0
0 0,05 0,1 0,15 0,2 0,25 0,3
WaveRoller nominal pump capacity (m³/s)
Table 7. Cost breakdown of Site 2 with a nominal pump capacity of 0,03 m³/s.
Capital expenses (€) Operational expenses (€)
WEC 1 800 000 90 000
RO 450 000 30 000
Total 2 250 000 120 000
Annual 210 000 120 000
Site 3 has a good wave climate, with an average wave power of 16 kW/m. The
performance and retention curves of Site 3 have been given in the Appendix B. The
calculation presented in this Chapter follows the calculation method described in
Chapter 9.1. The average recovery rate in all the calculations on Site 3 has been 28,5 %
and the average permeate TDS is 134 mg/l, which is well below the limit of 500 mg/l.
The permeate production on Site 3 is basically constantly increasing. The permeate
production is highest at 1685 m³/day at the end of the study range with a nominal pump
capacity of 0,24 m³/s, with a load factor of 0,76. The fact that the permeate production
increases even though the load factor constantly decreases signifies that the wave power
resource on Site 3 is of a suitable type for the AaltoRO process. Still the peak
production is less than in Site 1 (1996 m³/day). The permeate production of Site 3 is
presented in Figure 46.
63
1,2
1
0,8
0,6
0,4
0,2
Load factor