Step 3 - Cleaning With Sodium Hypochlorite (Naocl) - ProMinent DULCOMETER PH-501 Assembly And Operating Instructions Manual

b. TNK-601 holds approx. 8 m3 or 8000L.
7. Turn on air scour for 2 min to mix the solution and turn it off during membrane soak.
8. Allow membranes to soak for 1 to 2 hours.
9. Drain spent solution.

7.3.2.3 Step 3 - Cleaning with Sodium Hypochlorite (NaOCl)

1. Turn off air scour
2. Confirm that the membrane tank (TNK-601) has been cleaned and refilled with water (Section
7.3.2.1).
3. Add NaOCl into the membrane tank to a concentration of 500 mg/L as free chlorine (max.
1,000 mg/L). Turn on air scour for 2 min to mix the solution and turn it off during membrane
soak.
Volume of NaOCI required can be calculated with the following formula:
. 0 05
V
m
V
x
C
s
: Volume of membrane tank - TNK-601 holds approx. 8.0 m3 / 8000L.
: NaOCI concentration (%)
: Volume of NaOCl required (m3 or Litre)
4. Keep the membranes soaked for 8 to 12 hours in the NaOCl solution (longer soak time
required if severe fouling is evident).
5. Drain spent NaOCl solution.
6. Rinse membrane filter thoroughly with potable water by filling and draining the entire tank.
Rinse waters are drained to the sump/recycle back to the headwork.
7. Repeat step 6 to ensure all NaOCl has been thoroughly removed.
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