Procedure - ProMinent DULCOMETER PH-501 Assembly And Operating Instructions Manual

7.3.1.3 Procedure – Organic Fouling Solution
Inorganic Fouling - Citric Acid: 2 g/L solution (up to 20 g/L). Used for removal of inorganic fouling.
This is typically only required for systems treating water with a high hardness.
Rinse membrane filter and backwash tank thoroughly with potable water
to completely remove NaOCl solution before treatment with citric acid.
Mixing NaOCl with citric acid releases toxic chlorine gas!

7.3.1.4 Procedure

1) Ensure MV-701/2 series motorized valves and SV-801 solenoid valve are set to off ("O").
The system is now ready for a chemical backwash. Note: only one membrane module
should be backwashed at a time. The modules can be isolated by closing the permeate
valves (there are valves per module)
2) Turn off all blowers in the membrane tank to be backwashed (B-601)
3) Turn the MV-701/702 motorized valve to hand ("H") then turn pump P-801 to hand ("H") until
the backwash tank has drained.
4) Turn pump P-801 to off ("O") and then turn the MV-701/702 motorized valve to off ("O").
5) Let membranes soak for 45 mins or so.
6) After soaking membranes, turn the blowers back on (B-601) and allow blowers to scour for -
15 minutes.
7) After the 15 minute scour turn all valves and pump back to auto ("A")
8) Turn SV-801 solenoid valves to off ("O")
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