Frequently Asked Questions about Reverse Osmosis Membranes and Ion Exchange Resins (81-90)

81. What should I do if I encounter error message 3706 when starting the ROSA software program?

This problem sometimes occurs when starting ROSA5. Please follow these steps:

Open ROSA.INI in the ROSA directory and make the following modifications:

Change ROSA Provider = Microsoft.Jet.OLEDB.4.0 to

ROSA Provider = Microsoft.Jet.OLEDB.3.51

Change CFG Provider = Microsoft.Jet.OLEDB.4.0 to

CFG Provider = Microsoft.Jet.OLEDB.3.51

Or reinstall mdac 2.5.exe on your computer.

82. How is the power consumption of the RO system calculated?

When the actual horsepower (or power) of the motor paired with the pump is unavailable, you can estimate energy consumption using the following equations:

HP = (Inlet water pressure psi) × (Inlet water flow rate gpm) × 1714 × (Pump and motor efficiency);

kWh = (Inlet water pressure bar) × (Inlet water flow rate m³/h) × 35.9 × (Pump and motor efficiency)

1kW = 1HP/1.34

Daily cost ($) = (Required kW) × (24hr/day) × (Electricity cost $/kWh)

83. What is the longest permissible downtime without system flushing?

If the system uses scale inhibitors, approximately 4 hours when the water temperature is between 20 and 38°C; approximately 8 hours below 20°C;

If the system does not use scale inhibitors, approximately 1 day.

84. How to prevent ROSA results saved in .html format from being overwritten? Method 1: Change the name of the first .html result before rerunning the design software.

Method 2: Change the project name when rerunning the design calculation.

85. What is the minimum concentrate discharge rate for Dow FILMTEC membrane elements?

The minimum concentrate discharge rate for each element in the system depends on the membrane element size, model, and feed water type (SDI15 value). Please refer to the design guidelines.

86. When I perform design calculations using the software, an .html file containing the calculation results is automatically generated and saved in the DATA subdirectory. When recalculating, this .html file is overwritten. How can I retain both the original and recalculated .html results?

Rename the first .html file and then rerun the design calculation, or change the project name before rerunning the design calculation.

87. When I save the wtdata.mdb database as an email attachment, it becomes too large. What should I do?

Use WinZip to compress the database; this usually reduces it by 80-90%.

88. How do I delete a design calculation from the database? Open the name of the project you wish to delete, then press CTRL-R or, on the ROSA System Selection and Data Entry interface, select Remove Project from the File menu.

89. Is there a sample format for membrane system data records?

Yes, please refer to the introduction in the System Operation Management chapter.

90. Can the calculation results be saved as a .txt document like in ROSA 4.3, so that they can be saved in Word or Excel format?

No. The current output format is .html. Cutting, copying, and pasting into Word or Excel will cause errors. However, right-clicking on the .html file usually activates the Open with Word option, which generates a Word table. You can then adjust the table, for example, using View -> Page Layout and saving it as a Word file (.doc).