December 13
th
, 2011
The paper filtration test measurement procedure
1. Make a filter paper folded (Fig 1).Use filter paper equivalent to No.5C which has a
diameter of 185mm (See below tables for reference.)
Fig 1. Filter paper folded
2. Set the filter paper onto a funnel.
3. Prepare 50mL of activated sludge in a measuring cylinder.
4. Pour 50mL of the sludge into the filter paper, and start measuring filtration time.
5. After 5 minutes, check the filtration volume.
<Criteria>
More than 10 mL:
Good filterability
5~10 mL:
Subtle
Less than 5 mL:
Bad filterability
6. Additionally it is advisable to check the turbidity and/or TOC (Total Organic Carbon) of
the filtrated water which can be an indicator of membrane foulant such as so-called EPC.
Measure it routinely and check its trend.
Standards of filter paper
Used by TORAY
JIS P 3801
ASTM E832-81
No.5C
5C
ClassG
Typical specifications of the filter paper
No.5C
Mass (g/m
2
)
118
Thickness (mm)
0.22
Permeated particle size (μm)
1
Catching efficiency (0.3 μmDOP%)
93
Ash (%)
0.01
