Defining RO/ROSC Design Guidelines, Water Types and Subtypes
DuPont Water Solutions provides design guidelines based on the element selected and the type of water fed to the RO/ROSC system. These guidelines apply to:
- Recommended recovery for each element
- Maximum feed flow to each element
- Maximum permeate flow from each element
- Minimum concentrate flow from each element
These guideline values are aligned with specific feed water types; thus a choice of feed water type is effectively a choice of which guideline to use.
The Water Types and Subtypes used in WAVE are shown in the Table 1 below. For RO/NF/ROSC, the SDI (silt deposition index) is a key differentiator.
Table 1: WAVE Water Types and Subtypes visible in RO/NF/ROSC.
|
Source Water |
Subtype |
|---|---|
|
RO/NF Permeate |
SDI <1 |
|
Softened |
With DUPONT™ UF, SDI < 2.5 |
|
SDI<3 |
|
|
Municipal |
With DUPONT™ UF, SDI < 2.5 |
|
SDI<3 |
|
|
SDI<5 |
|
|
Well water |
With DUPONT™ UF, SDI < 2.5 |
|
SDI<3 |
|
|
Surface Water |
With DUPONT™ UF, SDI < 2.5 |
|
SDI<3 |
|
|
SDI<5 |
|
|
Seawater |
With DUPONT™ UF, SDI < 2.5 |
|
With membrane pretreatment, SDI<3 |
|
|
With conventional pretreatment, SDI<5 |
|
|
Wastewater |
With DUPONT™ UF, SDI < 2.5 |
|
With membrane pretreatment, SDI<3 |
|
|
With conventional pretreatment, SDI<5 |