AQUADYN® FZ50 Series Hollow Fiber Module | OPERATION MANUAL
MICRODYN-NADIR | REVISION: B | DATE: 01/08/2020
17
b.
If the membrne performance is not sufficiently restored after one chemcial cleaning, repeat the cleaning
procedure (Steps 1-8).
7.2.2
Measuring the Flux
The clean water flux for AQUADYN
®
FZ50 modules is measured using ultrafiltered water at 0.05 MPa feed pressure, an
average transmembrane pressure (TMP) of 0.1 MPa and a temperature of 25°C (77°F).
The efficacy of the chemical cleaning is determined by comparing the clean water flux values before after chemical cleaning
(see Figure 4).
Flux Measurement Conditions
•
Feed water: ulltrafiltered pure water
•
Filtration mode: dead-end filtration by fully closing the feed water
outlet port
•
Inlet pressure: approximately 0.05 MPa
Measurements
•
P1: Module inlet pressure (refer to Figure 4)
•
P2: Module outlet pressure
•
P3: Module permeate pressure
•
F1: Water quantity filtered by module (should be equivalent to
quantity of supplied water)
•
T1: Water temperature
•
t: Factor for correcting the temperature from T1 based on the
viscosity change of water (refer to Table 5)
Calculation of Flux
The flux converted per 25°C and 0.1 MPa is calculated with the following
formula:
Average TMP difference, P0 = {(P1+P2)/2} - {P3/2}
Flux, F = (F1*t) / (P0/0.1 MPa)
Figure 4.
This diagram shows the three
different points on the module where
pressure is measured.
