Step 1 - Preparation; Step 2 - Cleaning With High Ph Solution - ProMinent DULCOMETER PH-501 Assembly And Operating Instructions Manual

7.3.2.1 Step 1 - Preparation

1. Turn off air scour – B-601/602
2. Drain all mixed liquor from the membrane.
3. Open the MBR tank hatch. Clean (wash down) the membrane tank with water and vacuum
out the dirty liquid. Close the MBR tank hatch.
4. Fill the membrane tank with potable water until the membranes are completely covered. The
membrane tank (TNK-601/2) holds approx. 8.0 m3 / 6000L.
7.3.2.2 Step 2 – Cleaning with High pH Solution
This step is to be done if membrane fouling is a result of high FOG. Note: FOG in influent
wastewater should be maintained below 30 mg/L.
5. Confirm that the membrane tank (TNK-601/2) has been cleaned and refilled with water
(Section 7.3.2.1).
6. Add a suitable chemical – normally caustic soda (Sodium hydroxide (NaOH)) - to the
membrane tank to raise the pH to 12.
a. Volume of NaOH required can be calculated as follows. A starting dose for NaOH would
be 400 mg/L. For example: if using a 50% solution of sodium hydroxide, approximately
0.5 L of solution would be required per m3 of membrane tank. Additional NaOH may be
required depending on the alkalinity of the water. The operator should measure pH after
addition of 400 mg/L and add more until the pH is 12.
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