The parameter at a glance.
Settled Sludge Level describes the volume occupied by the settled sludge. Reviewing SSL with MLSS and SVI gives a more complete view of settlement behaviour.
mL/L
Unit or result
30 minutes
Test timing
Measured after settlement
S3A scope
Understanding Settled Sludge Level (SSL).
Settled Sludge Level describes the volume occupied by the settled sludge. Reviewing SSL with MLSS and SVI gives a more complete view of settlement behaviour.
Track settlement
SSL shows how much volume the sludge occupies after the defined 30-minute settlement period.
Compare like with like
Use a representative sample and a consistent sampling point when comparing results between tests, lanes or operating periods.
Read with MLSS
Samples can occupy a similar settled volume while containing different solids concentrations, so SSL should be reviewed with MLSS.
One sample. A complete settlement picture.
The S3A measures MLSS rapidly, then continues the unattended 30-minute settlement test for SVI, SSL, supernatant clarity and floating sludge. The optional stirrer is required for SSVI and SSSL.
01 / MLSS
Rapid MLSS measurement
A result in approximately 10 seconds from a compact 210 ml sample, within the specified 50 to 6,500 mg/L range.
02 / Settlement test
Unattended settlement analysis
The analyser continues the 30-minute cycle and stores the completed result after the test has finished.
Designed for routine activated-sludge checks.
The S3A uses a compact 210 ml representative sample in a safe-area wastewater-treatment environment. The 30-minute settlement cycle runs unattended, allowing the operator to continue with other work.
Completed results can be stored for each of three locations, with date and time information.
Explore related S3A parameters.
See how the S3A measurements work together within one repeatable settlement-analysis workflow.
MLSS
Measure mixed liquor suspended solids from a compact 210 ml sample in approximately 10 seconds.
SVI
Relate settled sludge volume to MLSS concentration after the 30-minute settlement test.
Floating Sludge
Record an indication of sludge floating or rising during the settlement cycle.