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December 13
th
, 2011
Rev.3 June 12
th
, 2020
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 on a 50mL measuring cylinder..
3. Prepare 50mL of activated sludge with another 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.
