Using the configuration which is already described, we removed 150 l of permeate to a tank above the 1m3 tank, and then permeate was returning to the 1 m3 by overflowing. as a result the system reached steady state not at 37000 mg/l (which is the real salinity of the seawater of the region), but at a higher salinity of around 44775 mg/l.
On Saturday, we ran for around 4 hours the system (powered by the grid), to observe how it operates.
We observed the following in the beginning:
Feed conductivity= 68.8 mS/cm which corresponds to: 44775 mg/l at 27.4 C
permeate conductivity= 1149 μS/cm which corresponds to 747 mg/l at 27.5 C
concentrate conductivity= 75 mS/cm which corresponds to 48810 mg/l.
membrane pressure= 56 bar
ΔP of prefilter = 1.2 bar
Qfeed = 5 gpm
Qpermeate = 0.95 gpm
flux= 14.6 lit / h*m2 (Membrane total area = 14.8 m2)
After 4 hours we observed:
Feed conductivity=67.5 mS/cm which corresponds to: 43929 mg/l at 28.8 C
permeate conductivity= 1187 μS/cm which corresponds to 772 mg/l at 28.9 C
membrane pressure= 55 bar
ΔP of prefilter = 1.2 bar
Qfeed = 4.8 gpm
Qpermeate = 0.95 gpm
flux= 14.6 lit/h * m2
in the course of 4 hours the temperature rose 1.4 C, and also the permeate conductivity rose instead of falling. Its considerably high compared to the results in the lab.
At the end of the day we flushed with 200 l of demineralised water, making sure that the membranes were totally clean. We will see today if we have any differences in permeate quality.
We decided also to dilute the seawater in the tank with demineralised water, so that after filling the 140l permeate in the small tank, the steady state of the system would reach the salinity of the real seawater in chania (around 37000 mg/l).
On Saturday, we ran for around 4 hours the system (powered by the grid), to observe how it operates.
We observed the following in the beginning:
Feed conductivity= 68.8 mS/cm which corresponds to: 44775 mg/l at 27.4 C
permeate conductivity= 1149 μS/cm which corresponds to 747 mg/l at 27.5 C
concentrate conductivity= 75 mS/cm which corresponds to 48810 mg/l.
membrane pressure= 56 bar
ΔP of prefilter = 1.2 bar
Qfeed = 5 gpm
Qpermeate = 0.95 gpm
flux= 14.6 lit / h*m2 (Membrane total area = 14.8 m2)
After 4 hours we observed:
Feed conductivity=67.5 mS/cm which corresponds to: 43929 mg/l at 28.8 C
permeate conductivity= 1187 μS/cm which corresponds to 772 mg/l at 28.9 C
membrane pressure= 55 bar
ΔP of prefilter = 1.2 bar
Qfeed = 4.8 gpm
Qpermeate = 0.95 gpm
flux= 14.6 lit/h * m2
in the course of 4 hours the temperature rose 1.4 C, and also the permeate conductivity rose instead of falling. Its considerably high compared to the results in the lab.
At the end of the day we flushed with 200 l of demineralised water, making sure that the membranes were totally clean. We will see today if we have any differences in permeate quality.
We decided also to dilute the seawater in the tank with demineralised water, so that after filling the 140l permeate in the small tank, the steady state of the system would reach the salinity of the real seawater in chania (around 37000 mg/l).
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