UCTION MANUAL
Page 5
4.3 DAF Jar Test
1) To successfully manage manifold and tubing priming it is recommended that all jars are
positioned at the Platypus Jar Tester stations with tubing attached. This requires raw water
for Jar Testing to be
added with the Jars in position
- rather than disconnecting tubing to
fetch raw water remotely from the Jar Tester.
2) Perform a flocculation jar test using the 2L DAF Jar. This jar that incorporates the DAF
dispersion nozzle and sample tap.
The DAF jar may typically be filled to 2L prior to standard jar testing.
3) When the flocculation jar test is complete and the DAF saturator has been prepared, decant
enough fluid from the jar using the sample tap. The volume decanted should equal or
exceed the volume of air saturated water to be transferred during the DAF jar test.
Suggestion: decant into a measuring cylinder to measure volume accurately.
4) To commence the transfer of saturated solution into the 2L DAF jar(s), open the saturated
water outlet valve. Do not partially open the valve as this will impact on the performance of
the test.
The compressor should remain running; the air compressor’s air receiver volume then
offsets saturator outflow volumes to maintain pressure at the saturator.
Fully open the quarter turn manifold outlet valves for the jars under test.
Larger bubbles may initially be expelled to the jars at the commencement of the transfer.
This is minimised by the priming procedure so minimising the small volumes of “dead
water” remaining in the manifold-to-jar tubing.
Air saturated water introduced to the DAF jar(s) should be white and cloudy.
Flocs particles should begin to float to the top and form a float layer at the surface some
seconds after the respective transfer is complete/manifold outlet valve closed.
When using the distribution manifold with multiple jars a slight variance in level between the
jars might be observed. If a significant difference is observed in a particular jar, refer to
section 6 Maintenance for flow controller cleaning.
5) The volume of air saturated water transferred can be observed at the Saturator level
indicator scale.
Once the subnatant has cleared, draw a sample for assessment.
6) The saturator can be used to test more jars containing pre-flocculated water given enough
volume or water in the saturator for multiple tests.
