Degasification

Carbon dioxide removal from RO/NF/ROSC feed streams can be modeled in WAVE. This process is usually accompanied by pH adjustment. The steps below can be used (as shown in Figure 1):

1. Click on the Reverse Osmosis Tab if you are in a different Tab or Window.
2. Select the Pass of interest (Pass 1 or Pass 2 in WAVE).
3. Click on the “Add Chemicals/Degas” button. The Chemical Adjustment Popup Window will appear. This Window includes options for adjusting pH, degasification, addition of Antiscalants/SMBS (only the 1st Pass), specifying the process temperature and Pass recovery. This Window also includes a Table with the Feed composition (before adjustment) and the Concentrate composition calculated by WAVE.
4. Click on the “Degas” button, which should turn green. The Table in the Chemical Adjustment Popup Window would now include a column named “After Degas”. This would be reflected in the RO/NF/ROSC Process Flow Diagram after the user clicks “OK” (degasification symbol).
5. Click on one of the radio buttons next to entry fields for either” CO2 % Removal”, “CO2 Partial Pressure” or “CO2 Concentration (mg/L)”. WAVE would populate a grey box on the Ro diagram in the RO screen.

6. Click “OK”.

   

   Figure 1: Specification of RO/NF/ROSC System Degasification Specification: Choosing “Add Chemicals/Degas”; Choosing Degasification; Specifying CO2 removal and completion

WAVE would populate a grey box with red border on the RO diagram in the RO screen.