Feed water parameters

1. Case-1: 5PV for 1 Pass system
2. Case-2: 5PV for each stage of 2 stages for 1 Pass system
3. Case-3: 5PV for each stage of 2 stages for 1 Pass system under pH 7 control + antiscalants
4. Case-4: 10 PV for 1 Pass system
5. Case-5: 15 PV for 1 Pass system
6. Case-6: 15PV for each stage of 2 stages for 1 Pass system
7. Case-7: 15PV for each stage of 2 stages for 1 Pass system under control pH 7 + antiscalants
8. Case-8: (15PV for Pass-1 system under control pH 7 + antiscalants) +
   (15 PV for each stage of 2 stages for Pass-2 system)
9. Case-9: (15PV for Pass-1 system under control pH 7 + antiscalants) +
   (15 PV for each stage of 2 stages for Pass-2 system under pH control (9.0) w/ NaOH)
10. Case-10: (15PV for Pass-1 system under control pH 7 + antiscalants) +
    (15 PV for each stage of 2 stages for Pass-2 system under pH control (9.5) w/ NaOH)
11. Case-11: (15PV for Pass-1 system under control pH 7 + antiscalants) +
    (15 PV for each stage of 2 stages for Pass-2 system under pH control (10.0) w/ NaOH)
    Homework Assignments
    2
12. Feed water: 100 m3
    /h
13. RO recovery: 50%
14. Feed water source: Standard seawater
    • Total dissolved solids (TDS): 35,984 mg/L
    • Estimated conductivity: 53,423 μS/cm
15. Temperature: 25 ℃
16. Number of stages: 1, 2
17. #PV per stage: 5, 15
18. Element type:
    • SEAMAXX-440 for Pass-1
    • BW30HRLE-440
19. pH control
    • H2SO4
    to set pH 7.0 for 1 Pass system
20. Antiscalant: Na6P6O18(100) (3 mg/L recommended)
    RO Feed water parameters
    RO Pass configurations
    3
     Due date: 29-October, until noon, Thursday
     Printing out All Cases’ running results and enclose your evaluation on:
    For cases of 1, 4, 5
    1) TDS change in product water as PV increases.
    2) Pressure drop (ΔP) change as PV increases.
    3) Specific energy consumption (SEC) change over the applied pressure vessel.
    4) Draw a relationship graph of “permeate TDS” over “each element” in the applied PV.
    5) How do you think about the obtained above results?
    For cases of 1 and 2
    1) TDS change in product water before and after 2 stages are made.
    2) Pressure drop (ΔP) change before and after 2 stages are made.
    3) Specific energy consumption (SEC) change before and after 2 stages are made.
    4) How do you think about the obtained above results?
    For cases of (2 and 3) and (6 and 7)
    1) Isn’t there any change in RO performance output after chemical treatment in RO feed water?
    For cases of 2 and 6
    1) TDS change in product water in 2 stage system with different PV
    2) Pressure drop (ΔP) change in 2 stage system with different PV
    3) Specific energy consumption (SEC) change in 2 stage system with different PV
    4) How do think about the obtained above results?
    For cases of 7 and 8
    1) TDS change in net product from RO system in two cases
    2) Specific energy consumption (SEC) change in two cases.
    For cases of 9, 10, 11
    1) How are Boron concentrations changed in permeate water in pass-2 system as pH
    increased by NaOH?
    2) Isn’t there any issue in RO performance as pH increased in 2 Pass RO system?

Sample Solution