Specifying Feed Pressure, Boost Pressure, Back Pressure and Pre-stage Pressure Drop
The different pressure specifications for the RO/NF/ROSC system can be incorporated in WAVE as shown in Figure 1. The default values for Feed Pressure, Feed Pressure and Feed Pressure are all 0, while the default pre-stage pressure drop is 0.34 bar (5 psi).
Figure 1: Specification of Feed Pressure, Boost Pressure, Back Pressure and Pre-stage Pressure Drop
Notes:
- WAVE users can tell how much Feed Pressure, Boost Pressure and Back Pressure were applied from the table in the Reverse Osmosis Tab or by hovering their mouse cursor over the relevant symbol in the
- RO/NF/ROSC Process Flow Diagram.
- If the Feed Pressure is specified in WAVE, then the user would not be able to specify a recovery for the
- RO/NF/ROSC system. Even though WAVE allows the user to specify a recovery value in the Home Tab (for a system including only RO/NF/ROSC), the Calculation Engine would ignore the specified recovery value.
- WAVE allows the user to specify a Feed Pressure for one pass and a recovery for another pass.
- WAVE allows the user to specify different Feed Pressures for each pass.
- WAVE allows specification of Feed Pressure only for the 1st stage in each pass (even ISD).
- WAVE does not allow the specification of Boost Pressure for the 1st stage in each pass, as it is assumed that any boost needed is included in the Feed Pressure.