Worksheet 3 – Other forms of clarifiers
Complete the following details:
Name
Name of Instructor
Instructions
To record your answers for the activities and tasks, you will need to:
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2) type your response
When you close the document you will be prompted to save your changes. Save the document to your computer hard drive
or a removable storage device such as a USB drive.
When finished, print it and keep it with the other forms and records. You may be required to submit this document as part
of your evidence of learning for this task. Please check with your instructor or team leader.
Consult with people you work with and check organisational procedures to complete the
following table of issues specific to solids-contact or sludge blanket clarification system. How
would each problem be investigated and treated? Add at least three that are specific to your
workplace.
Worksheet 3 – Other forms of clarifiers
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Type of breakdown
How to investigate
How to treat the breakdown
Floc blanket too high causing
floc to be carrier up with the
clarified water.
If possible, measure the floc
blanket height to determine if it
has risen.
Check the frequency and
duration of sludge withdrawal.
Increase the frequency and
duration of sludge removal as
required.
In a pulsator clarifier, the water
might not be pulsed or pulsed
with the correct frequency
Check the vacuum pump is
switching on at the low level
point in the vacuum tower, and
is switching off at the high level
point.
Check that the vacuum pump is
drawing an adequate vacuum
on the tower. If not, check the
pump has been connected
properly with not leaking joints
or obstructions in the suction
line.
Check the tower cycle times for
suction and discharge are
correct.
Reset the circuit breakers or
carry out necessary electrical
maintenance as required.
Clear blockages, seal leaks or
repair (replace) pump as
required.
Adjust the level probes in the
tower to give the correct cycle
times.
1.
2.
3.
Worksheet 3 – Other forms of clarifiers
Page 2 of 2