A Feasibility Study - Aaltodoc - Aalto-yliopisto

Permeat (m³/day)
1800
1600
1400
1200
1000
800
600
400
0 0,05 0,1 0,15 0,2 0,25 0,3
WaveRoller nominal pump capacity (m³/s)
Figure 38. Permeate production (m³/day) with varying pressure levels on Site 1.
Figure 38 presents the permeate production (m³) per day. It is clear that as the pressure
level decreases the permeate production increases. There are two important
interdependencies which account for this results. First, as the pressure decreases, the
WaveRoller is able to pressurize more water to this lower pressure level, since the wave
power is taken to be constant. Second, lowering the pressure level also lowers the
recovery, meaning that a smaller portion of the feed water is turned into fresh water.
The conclusion drawn of Figure 38 is that the recovery percent declines slower than the
feed water amount increases, thus explaining the increased permeate production per
day. The peak permeate production increases as the pressure level decreases, from 1375
m³/day with 65 bar to 1800 m³/day with 45 bar. However, with the pressure level 40
bar, the peak production is only 1685 m³/day. Therefore, it does not seem to be a
suitable pressure level.
56
40 bar
45 bar
50 bar
55 bar
60 bar
65 bar