Reverse osmosis questionnaire

Please fill this questionnaire online. Fields marked with an asterisk are required.

1. General data

1.1 Location

1.2 Plant

1.3 Unit

1.4 Contact person

1.5 Telephone

1.6 E-mail

2. Technical data

2.1 Manufacturer of membrane system

2.2 Brand of membranes

2.3 Membrane age (years)

2.4 Membrane unit scheme (passes and stages)

2.5 Feed water source

2.6 Feed water pretreatment scheme (filtration? ultrafiltration? ion exchange? iron removing?)

2.7 Feed water SDI (if known)

2.8 Pressure / conductivity / temperature — for feed water, permeate and concentrate

2.9 Volume of chemical cleaning solution storage

2.10 Free pH or controlled pH (if controlled pH, write target pH value)

3. KPI

3.1 How often are membranes replaced?

3.2 How often are membranes cleaned?

3.3 How is the decision about cleaning made (decreasing of performance, of pressure or every defined time interval)?

3.4 Which problems could be found (biofouling, scale)?

3.5 Provide results of membrane autopsy if available

4. Chemical data

Chemical

5. Additional info

5.1 Add any additional information you consider useful

5.2 Attach chemical analysis historical data (for 12 months)

5.3 Attach technical parameters log (for 12 months)